up

Remove reminder comment.

.github/workflows/pr_tests.yml

@@ -60,6 +60,7 @@ jobs:
       run: |
         python -m pip install -e .[quality,test]
         python -m pip install git+https://github.com/huggingface/accelerate
+        python -m pip install -U git+https://github.com/huggingface/transformers
 
     - name: Environment
       run: |
@@ -127,6 +128,7 @@ jobs:
         ${CONDA_RUN} python -m pip install -e .[quality,test]
         ${CONDA_RUN} python -m pip install --pre torch==${MPS_TORCH_VERSION} --extra-index-url https://download.pytorch.org/whl/test/cpu
         ${CONDA_RUN} python -m pip install git+https://github.com/huggingface/accelerate
+        ${CONDA_RUN} python -m pip install -U git+https://github.com/huggingface/transformers
 
     - name: Environment
       shell: arch -arch arm64 bash {0}

.github/workflows/push_tests.yml

@@ -62,6 +62,7 @@ jobs:
       run: |
         python -m pip install -e .[quality,test]
         python -m pip install git+https://github.com/huggingface/accelerate
+        python -m pip install -U git+https://github.com/huggingface/transformers
 
     - name: Environment
       run: |
@@ -131,6 +132,7 @@ jobs:
       run: |
         python -m pip install -e .[quality,test,training]
         python -m pip install git+https://github.com/huggingface/accelerate
+        python -m pip install -U git+https://github.com/huggingface/transformers
 
     - name: Environment
       run: |

README.md

@@ -345,7 +345,8 @@ Textual Inversion is a technique for capturing novel concepts from a small numbe
 
 ## Stable Diffusion Community Pipelines
 
-The release of Stable Diffusion as an open source model has fostered a lot of interesting ideas and experimentation. Our [Community Examples folder](https://github.com/huggingface/diffusers/tree/main/examples/community) contains many ideas worth exploring, like interpolating to create animated videos, using CLIP Guidance for additional prompt fidelity, term weighting, and much more! [Take a look](https://huggingface.co/docs/diffusers/using-diffusers/custom_pipeline_overview) and [contribute your own](https://huggingface.co/docs/diffusers/using-diffusers/contribute_pipeline).
+The release of Stable Diffusion as an open source model has fostered a lot of interesting ideas and experimentation. 
+Our [Community Examples folder](https://github.com/huggingface/diffusers/tree/main/examples/community) contains many ideas worth exploring, like interpolating to create animated videos, using CLIP Guidance for additional prompt fidelity, term weighting, and much more! [Take a look](https://huggingface.co/docs/diffusers/using-diffusers/custom_pipeline_overview) and [contribute your own](https://huggingface.co/docs/diffusers/using-diffusers/contribute_pipeline).
 
 ## Other Examples
 
@@ -394,10 +395,14 @@ image.save("ddpm_generated_image.png")
 - [Unconditional Latent Diffusion](https://huggingface.co/CompVis/ldm-celebahq-256)
 - [Unconditional Diffusion with continuous scheduler](https://huggingface.co/google/ncsnpp-ffhq-1024)
 
-**Other Notebooks**:
+**Other Image Notebooks**:
 * [image-to-image generation with Stable Diffusion](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/image_2_image_using_diffusers.ipynb) ![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg),
 * [tweak images via repeated Stable Diffusion seeds](https://colab.research.google.com/github/pcuenca/diffusers-examples/blob/main/notebooks/stable-diffusion-seeds.ipynb) ![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg),
 
+**Diffusers for Other Modalities**:
+* [Molecule conformation generation](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/geodiff_molecule_conformation.ipynb) ![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg),
+* [Model-based reinforcement learning](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/reinforcement_learning_with_diffusers.ipynb) ![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg),
+
 ### Web Demos
 If you just want to play around with some web demos, you can try out the following 🚀 Spaces:
 | Model                          	| Hugging Face Spaces                                                                                                                                               	|

docs/source/_toctree.yml

@@ -31,6 +31,14 @@
     - local: using-diffusers/contribute_pipeline
       title: "How to contribute a Pipeline"
     title: "Pipelines for Inference"
+  - sections:
+    - local: using-diffusers/rl
+      title: "Reinforcement Learning"
+    - local: using-diffusers/audio
+      title: "Audio"
+    - local: using-diffusers/other-modalities
+      title: "Other Modalities"
+    title: "Taking Diffusers Beyond Images"
   title: "Using Diffusers"
 - sections:
   - local: optimization/fp16
@@ -98,13 +106,23 @@
       title: "Score SDE VE"
     - local: api/pipelines/stable_diffusion
       title: "Stable Diffusion"
+    - local: api/pipelines/stable_diffusion_2
+      title: "Stable Diffusion 2"
+    - local: api/pipelines/stable_diffusion_safe
+      title: "Safe Stable Diffusion"
     - local: api/pipelines/stochastic_karras_ve
       title: "Stochastic Karras VE"
     - local: api/pipelines/dance_diffusion
       title: "Dance Diffusion"
+    - local: api/pipelines/versatile_diffusion
+      title: "Versatile Diffusion"
     - local: api/pipelines/vq_diffusion
       title: "VQ Diffusion"
     - local: api/pipelines/repaint
       title: "RePaint"
     title: "Pipelines"
+  - sections:
+    - local: api/experimental/rl
+      title: "RL Planning"
+    title: "Experimental Features"
   title: "API"

docs/source/api/experimental/rl.mdx

@@ -0,0 +1,15 @@
+<!--Copyright 2022 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# TODO
+
+Coming soon!

docs/source/api/pipelines/alt_diffusion.mdx

@@ -32,7 +32,7 @@ The abstract of the paper is the following:
 
 - *Run AltDiffusion*
 
-AltDiffusion can be tested very easily with the [`AltDiffusionPipeline`], [`AltDiffusionImg2ImgPipeline`] and the `"BAAI/AltDiffusion"` checkpoint exactly in the same way it is shown in the [Conditional Image Generation Guide](./using-diffusers/conditional_image_generation) and the [Image-to-Image Generation Guide](./using-diffusers/img2img).
+AltDiffusion can be tested very easily with the [`AltDiffusionPipeline`], [`AltDiffusionImg2ImgPipeline`] and the `"BAAI/AltDiffusion-m9"` checkpoint exactly in the same way it is shown in the [Conditional Image Generation Guide](./using-diffusers/conditional_image_generation) and the [Image-to-Image Generation Guide](./using-diffusers/img2img).
 
 - *How to load and use different schedulers.*
 
@@ -42,16 +42,16 @@ To use a different scheduler, you can either change it via the [`ConfigMixin.fro
 ```python
 >>> from diffusers import AltDiffusionPipeline, EulerDiscreteScheduler
 
->>> pipeline = AltDiffusionPipeline.from_pretrained("BAAI/AltDiffusion")
+>>> pipeline = AltDiffusionPipeline.from_pretrained("BAAI/AltDiffusion-m9")
 >>> pipeline.scheduler = EulerDiscreteScheduler.from_config(pipeline.scheduler.config)
 
 >>> # or
->>> euler_scheduler = EulerDiscreteScheduler.from_pretrained("BAAI/AltDiffusion", subfolder="scheduler")
->>> pipeline = AltDiffusionPipeline.from_pretrained("BAAI/AltDiffusion", scheduler=euler_scheduler)
+>>> euler_scheduler = EulerDiscreteScheduler.from_pretrained("BAAI/AltDiffusion-m9", subfolder="scheduler")
+>>> pipeline = AltDiffusionPipeline.from_pretrained("BAAI/AltDiffusion-m9", scheduler=euler_scheduler)
 ```
 
 
-- *How to conver all use cases with multiple or single pipeline*
+- *How to convert all use cases with multiple or single pipeline*
 
 If you want to use all possible use cases in a single `DiffusionPipeline` we recommend using the `components` functionality to instantiate all components in the most memory-efficient way:
 
@@ -61,10 +61,10 @@ If you want to use all possible use cases in a single `DiffusionPipeline` we rec
 ...     AltDiffusionImg2ImgPipeline,
 ... )
 
->>> img2text = AltDiffusionPipeline.from_pretrained("BAAI/AltDiffusion")
->>> img2img = AltDiffusionImg2ImgPipeline(**img2text.components)
+>>> text2img = AltDiffusionPipeline.from_pretrained("BAAI/AltDiffusion-m9")
+>>> img2img = AltDiffusionImg2ImgPipeline(**text2img.components)
 
->>> # now you can use img2text(...) and img2img(...) just like the call methods of each respective pipeline
+>>> # now you can use text2img(...) and img2img(...) just like the call methods of each respective pipeline
 ```
 
 ## AltDiffusionPipelineOutput

docs/source/api/pipelines/overview.mdx

@@ -58,7 +58,14 @@ available a colab notebook to directly try them out.
 | [stable_diffusion](./api/pipelines/stable_diffusion) | [**Stable Diffusion**](https://stability.ai/blog/stable-diffusion-public-release) | Text-to-Image Generation | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/training_example.ipynb)
 | [stable_diffusion](./api/pipelines/stable_diffusion) | [**Stable Diffusion**](https://stability.ai/blog/stable-diffusion-public-release) | Image-to-Image Text-Guided Generation | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/image_2_image_using_diffusers.ipynb)
 | [stable_diffusion](./api/pipelines/stable_diffusion) | [**Stable Diffusion**](https://stability.ai/blog/stable-diffusion-public-release) | Text-Guided Image Inpainting | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/in_painting_with_stable_diffusion_using_diffusers.ipynb)
-| [stochastic_karras_ve](./api/pipelines/stochastic_karras_ve) | [**Elucidating the Design Space of Diffusion-Based Generative Models**](https://arxiv.org/abs/2206.00364) | Unconditional Image Generation | 
+| [stable_diffusion_2](./api/pipelines/stable_diffusion_2) | [**Stable Diffusion 2**](https://stability.ai/blog/stable-diffusion-v2-release) | Text-to-Image Generation | 
+| [stable_diffusion_2](./api/pipelines/stable_diffusion_2) | [**Stable Diffusion 2**](https://stability.ai/blog/stable-diffusion-v2-release) | Text-Guided Image Inpainting | 
+| [stable_diffusion_2](./api/pipelines/stable_diffusion_2) | [**Stable Diffusion 2**](https://stability.ai/blog/stable-diffusion-v2-release) | Text-Guided Super Resolution Image-to-Image |
+| [stable_diffusion_safe](./api/pipelines/stable_diffusion_safe) | [**Safe Stable Diffusion**](https://arxiv.org/abs/2211.05105) | Text-Guided Generation | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/ml-research/safe-latent-diffusion/blob/main/examples/Safe%20Latent%20Diffusion.ipynb)
+| [stochastic_karras_ve](./api/pipelines/stochastic_karras_ve) | [**Elucidating the Design Space of Diffusion-Based Generative Models**](https://arxiv.org/abs/2206.00364) | Unconditional Image Generation |
+| [versatile_diffusion](./api/pipelines/versatile_diffusion) | [Versatile Diffusion: Text, Images and Variations All in One Diffusion Model](https://arxiv.org/abs/2211.08332) | Text-to-Image Generation | 
+| [versatile_diffusion](./api/pipelines/versatile_diffusion) | [Versatile Diffusion: Text, Images and Variations All in One Diffusion Model](https://arxiv.org/abs/2211.08332) | Image Variations Generation | 
+| [versatile_diffusion](./api/pipelines/versatile_diffusion) | [Versatile Diffusion: Text, Images and Variations All in One Diffusion Model](https://arxiv.org/abs/2211.08332) | Dual Image and Text Guided Generation | 
 | [vq_diffusion](./api/pipelines/vq_diffusion) | [Vector Quantized Diffusion Model for Text-to-Image Synthesis](https://arxiv.org/abs/2111.14822) | Text-to-Image Generation | 
 
 

docs/source/api/pipelines/stable_diffusion.mdx

@@ -48,7 +48,7 @@ To use a different scheduler, you can either change it via the [`ConfigMixin.fro
 ```
 
 
-### How to conver all use cases with multiple or single pipeline
+### How to convert all use cases with multiple or single pipeline
 
 If you want to use all possible use cases in a single `DiffusionPipeline` you can either:
 - Make use of the [Stable Diffusion Mega Pipeline](https://github.com/huggingface/diffusers/tree/main/examples/community#stable-diffusion-mega) or 
@@ -61,11 +61,11 @@ If you want to use all possible use cases in a single `DiffusionPipeline` you ca
 ...     StableDiffusionInpaintPipeline,
 ... )
 
->>> img2text = StableDiffusionPipeline.from_pretrained("CompVis/stable-diffusion-v1-4")
->>> img2img = StableDiffusionImg2ImgPipeline(**img2text.components)
->>> inpaint = StableDiffusionInpaintPipeline(**img2text.components)
+>>> text2img = StableDiffusionPipeline.from_pretrained("CompVis/stable-diffusion-v1-4")
+>>> img2img = StableDiffusionImg2ImgPipeline(**text2img.components)
+>>> inpaint = StableDiffusionInpaintPipeline(**text2img.components)
 
->>> # now you can use img2text(...), img2img(...), inpaint(...) just like the call methods of each respective pipeline
+>>> # now you can use text2img(...), img2img(...), inpaint(...) just like the call methods of each respective pipeline
 ```
 
 ## StableDiffusionPipelineOutput
@@ -76,15 +76,40 @@ If you want to use all possible use cases in a single `DiffusionPipeline` you ca
 	- __call__
 	- enable_attention_slicing
 	- disable_attention_slicing
+	- enable_vae_slicing
+	- disable_vae_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
 
 ## StableDiffusionImg2ImgPipeline
 [[autodoc]] StableDiffusionImg2ImgPipeline
 	- __call__
 	- enable_attention_slicing
 	- disable_attention_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
 
 ## StableDiffusionInpaintPipeline
 [[autodoc]] StableDiffusionInpaintPipeline
 	- __call__
 	- enable_attention_slicing
 	- disable_attention_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
+
+## StableDiffusionImageVariationPipeline
+[[autodoc]] StableDiffusionImageVariationPipeline
+	- __call__
+	- enable_attention_slicing
+	- disable_attention_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention
+
+
+## StableDiffusionUpscalePipeline
+[[autodoc]] StableDiffusionUpscalePipeline
+	- __call__
+	- enable_attention_slicing
+	- disable_attention_slicing
+	- enable_xformers_memory_efficient_attention
+	- disable_xformers_memory_efficient_attention

docs/source/api/pipelines/stable_diffusion_2.mdx

@@ -0,0 +1,142 @@
+<!--Copyright 2022 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# Stable diffusion 2
+
+Stable Diffusion 2 is a text-to-image _latent diffusion_ model built upon the work of [Stable Diffusion 1](https://stability.ai/blog/stable-diffusion-public-release). 
+The project to train Stable Diffusion 2 was led by Robin Rombach and Katherine Crowson from [Stability AI](https://stability.ai/) and [LAION](https://laion.ai/).
+
+*The Stable Diffusion 2.0 release includes robust text-to-image models trained using a brand new text encoder (OpenCLIP), developed by LAION with support from Stability AI, which greatly improves the quality of the generated images compared to earlier V1 releases. The text-to-image models in this release can generate images with default resolutions of both 512x512 pixels and 768x768 pixels. 
+These models are trained on an aesthetic subset of the [LAION-5B dataset](https://laion.ai/blog/laion-5b/) created by the DeepFloyd team at Stability AI, which is then further filtered to remove adult content using [LAION’s NSFW filter](https://openreview.net/forum?id=M3Y74vmsMcY).*
+
+For more details about how Stable Diffusion 2 works and how it differs from Stable Diffusion 1, please refer to the official [launch announcement post](https://stability.ai/blog/stable-diffusion-v2-release).
+
+## Tips
+
+### Available checkpoints:
+
+Note that the architecture is more or less identical to [Stable Diffusion 1](./api/pipelines/stable_diffusion) so please refer to [this page](./api/pipelines/stable_diffusion) for API documentation.
+
+- *Text-to-Image (512x512 resolution)*: [stabilityai/stable-diffusion-2-base](https://huggingface.co/stabilityai/stable-diffusion-2-base) with [`StableDiffusionPipeline`]
+- *Text-to-Image (768x768 resolution)*: [stabilityai/stable-diffusion-2](https://huggingface.co/stabilityai/stable-diffusion-2) with [`StableDiffusionPipeline`]
+- *Image Inpainting (512x512 resolution)*: [stabilityai/stable-diffusion-2-inpainting](https://huggingface.co/stabilityai/stable-diffusion-2-inpainting) with [`StableDiffusionInpaintPipeline`]
+- *Image Upscaling (x4 resolution resolution)*: [stable-diffusion-x4-upscaler](https://huggingface.co/stabilityai/stable-diffusion-x4-upscaler) [`StableDiffusionUpscalePipeline`]
+
+We recommend using the [`DPMSolverMultistepScheduler`] as it's currently the fastest scheduler there is.
+
+- *Text-to-Image (512x512 resolution)*:
+
+```python
+from diffusers import DiffusionPipeline, DPMSolverMultistepScheduler
+import torch
+
+repo_id = "stabilityai/stable-diffusion-2-base"
+pipe = DiffusionPipeline.from_pretrained(repo_id, torch_dtype=torch.float16, revision="fp16")
+
+pipe.scheduler = DPMSolverMultistepScheduler.from_config(pipe.scheduler.config)
+pipe = pipe.to("cuda")
+
+prompt = "High quality photo of an astronaut riding a horse in space"
+image = pipe(prompt, num_inference_steps=25).images[0]
+image.save("astronaut.png")
+```
+
+- *Text-to-Image (768x768 resolution)*:
+
+```python
+from diffusers import DiffusionPipeline, DPMSolverMultistepScheduler
+import torch
+
+repo_id = "stabilityai/stable-diffusion-2"
+pipe = DiffusionPipeline.from_pretrained(repo_id, torch_dtype=torch.float16, revision="fp16")
+
+pipe.scheduler = DPMSolverMultistepScheduler.from_config(pipe.scheduler.config)
+pipe = pipe.to("cuda")
+
+prompt = "High quality photo of an astronaut riding a horse in space"
+image = pipe(prompt, guidance_scale=9, num_inference_steps=25).images[0]
+image.save("astronaut.png")
+```
+
+- *Image Inpainting (512x512 resolution)*:
+
+```python
+import PIL
+import requests
+import torch
+from io import BytesIO
+
+from diffusers import DiffusionPipeline, DPMSolverMultistepScheduler
+
+
+def download_image(url):
+    response = requests.get(url)
+    return PIL.Image.open(BytesIO(response.content)).convert("RGB")
+
+
+img_url = "https://raw.githubusercontent.com/CompVis/latent-diffusion/main/data/inpainting_examples/overture-creations-5sI6fQgYIuo.png"
+mask_url = "https://raw.githubusercontent.com/CompVis/latent-diffusion/main/data/inpainting_examples/overture-creations-5sI6fQgYIuo_mask.png"
+
+init_image = download_image(img_url).resize((512, 512))
+mask_image = download_image(mask_url).resize((512, 512))
+
+repo_id = "stabilityai/stable-diffusion-2-inpainting"
+pipe = DiffusionPipeline.from_pretrained(repo_id, torch_dtype=torch.float16, revision="fp16")
+
+pipe.scheduler = DPMSolverMultistepScheduler.from_config(pipe.scheduler.config)
+pipe = pipe.to("cuda")
+
+prompt = "Face of a yellow cat, high resolution, sitting on a park bench"
+image = pipe(prompt=prompt, image=init_image, mask_image=mask_image, num_inference_steps=25).images[0]
+
+image.save("yellow_cat.png")
+```
+
+- *Image Upscaling (x4 resolution resolution)*: [stable-diffusion-x4-upscaler](https://huggingface.co/stabilityai/stable-diffusion-x4-upscaler) [`StableDiffusionUpscalePipeline`]
+
+```python
+import requests
+from PIL import Image
+from io import BytesIO
+from diffusers import StableDiffusionUpscalePipeline
+import torch
+
+# load model and scheduler
+model_id = "stabilityai/stable-diffusion-x4-upscaler"
+pipeline = StableDiffusionUpscalePipeline.from_pretrained(model_id, revision="fp16", torch_dtype=torch.float16)
+pipeline = pipeline.to("cuda")
+
+# let's download an  image
+url = "https://huggingface.co/datasets/hf-internal-testing/diffusers-images/resolve/main/sd2-upscale/low_res_cat.png"
+response = requests.get(url)
+low_res_img = Image.open(BytesIO(response.content)).convert("RGB")
+low_res_img = low_res_img.resize((128, 128))
+prompt = "a white cat"
+upscaled_image = pipeline(prompt=prompt, image=low_res_img).images[0]
+upscaled_image.save("upsampled_cat.png")
+```
+
+### How to load and use different schedulers.
+
+The stable diffusion pipeline uses [`DDIMScheduler`] scheduler by default. But `diffusers` provides many other schedulers that can be used with the stable diffusion pipeline such as [`PNDMScheduler`], [`LMSDiscreteScheduler`], [`EulerDiscreteScheduler`], [`EulerAncestralDiscreteScheduler`] etc.
+To use a different scheduler, you can either change it via the [`ConfigMixin.from_config`] method or pass the `scheduler` argument to the `from_pretrained` method of the pipeline. For example, to use the [`EulerDiscreteScheduler`], you can do the following:
+
+```python
+>>> from diffusers import StableDiffusionPipeline, EulerDiscreteScheduler
+
+>>> pipeline = StableDiffusionPipeline.from_pretrained("stabilityai/stable-diffusion-2")
+>>> pipeline.scheduler = EulerDiscreteScheduler.from_config(pipeline.scheduler.config)
+
+>>> # or
+>>> euler_scheduler = EulerDiscreteScheduler.from_pretrained("stabilityai/stable-diffusion-2", subfolder="scheduler")
+>>> pipeline = StableDiffusionPipeline.from_pretrained("stabilityai/stable-diffusion-2", scheduler=euler_scheduler)
+```

docs/source/api/pipelines/stable_diffusion_safe.mdx

@@ -0,0 +1,90 @@
+<!--Copyright 2022 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# Safe Stable Diffusion
+
+Safe Stable Diffusion was proposed in [Safe Latent Diffusion: Mitigating Inappropriate Degeneration in Diffusion Models](https://arxiv.org/abs/2211.05105) and mitigates the well known issue that models like Stable Diffusion that are trained on unfiltered, web-crawled datasets tend to suffer from inappropriate degeneration. For instance Stable Diffusion may unexpectedly generate nudity, violence, images depicting self-harm, or otherwise offensive content.
+Safe Stable Diffusion is an extension to the Stable Diffusion that drastically reduces content like this.
+
+The abstract of the paper is the following:
+
+*Text-conditioned image generation models have recently achieved astonishing results in image quality and text alignment and are consequently employed in a fast-growing number of applications. Since they are highly data-driven, relying on billion-sized datasets randomly scraped from the internet, they also suffer, as we demonstrate, from degenerated and biased human behavior. In turn, they may even reinforce such biases. To help combat these undesired side effects, we present safe latent diffusion (SLD). Specifically, to measure the inappropriate degeneration due to unfiltered and imbalanced training sets, we establish a novel image generation test bed-inappropriate image prompts (I2P)-containing dedicated, real-world image-to-text prompts covering concepts such as nudity and violence. As our exhaustive empirical evaluation demonstrates, the introduced SLD removes and suppresses inappropriate image parts during the diffusion process, with no additional training required and no adverse effect on overall image quality or text alignment.*
+
+
+*Overview*:
+
+| Pipeline | Tasks | Colab | Demo
+|---|---|:---:|:---:|
+| [pipeline_stable_diffusion_safe.py](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/stable_diffusion_safe/pipeline_stable_diffusion_safe.py) | *Text-to-Image Generation* |  [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/ml-research/safe-latent-diffusion/blob/main/examples/Safe%20Latent%20Diffusion.ipynb) | -
+
+## Tips
+
+- Safe Stable Diffusion may also be used with weights of [Stable Diffusion](./api/pipelines/stable_diffusion).
+
+### Run Safe Stable Diffusion
+
+Safe Stable Diffusion can be tested very easily with the [`StableDiffusionPipelineSafe`], and the `"AIML-TUDA/stable-diffusion-safe"` checkpoint exactly in the same way it is shown in the [Conditional Image Generation Guide](./using-diffusers/conditional_image_generation).
+
+### Interacting with the Safety Concept
+
+To check and edit the currently used safety concept, use the `safety_concept` property of [`StableDiffusionPipelineSafe`]
+```python
+>>> from diffusers import StableDiffusionPipelineSafe
+
+>>> pipeline = StableDiffusionPipelineSafe.from_pretrained("AIML-TUDA/stable-diffusion-safe")
+>>> pipeline.safety_concept
+```
+For each image generation the active concept is also contained in [`StableDiffusionSafePipelineOutput`].
+
+### Using pre-defined safety configurations
+
+You may use the 4 configurations defined in the [Safe Latent Diffusion paper](https://arxiv.org/abs/2211.05105) as follows:
+
+```python
+>>> from diffusers import StableDiffusionPipelineSafe
+>>> from diffusers.pipelines.stable_diffusion_safe import SafetyConfig
+
+>>> pipeline = StableDiffusionPipelineSafe.from_pretrained("AIML-TUDA/stable-diffusion-safe")
+>>> prompt = "the four horsewomen of the apocalypse, painting by tom of finland, gaston bussiere, craig mullins, j. c. leyendecker"
+>>> out = pipeline(prompt=prompt, **SafetyConfig.MAX)
+```
+
+The following configurations are available: `SafetyConfig.WEAK`, `SafetyConfig.MEDIUM`, `SafetyConfig.STRONg`, and `SafetyConfig.MAX`.
+
+### How to load and use different schedulers.
+
+The safe stable diffusion pipeline uses [`PNDMScheduler`] scheduler by default. But `diffusers` provides many other schedulers that can be used with the stable diffusion pipeline such as [`DDIMScheduler`], [`LMSDiscreteScheduler`], [`EulerDiscreteScheduler`], [`EulerAncestralDiscreteScheduler`] etc.
+To use a different scheduler, you can either change it via the [`ConfigMixin.from_config`] method or pass the `scheduler` argument to the `from_pretrained` method of the pipeline. For example, to use the [`EulerDiscreteScheduler`], you can do the following:
+
+```python
+>>> from diffusers import StableDiffusionPipelineSafe, EulerDiscreteScheduler
+
+>>> pipeline = StableDiffusionPipelineSafe.from_pretrained("AIML-TUDA/stable-diffusion-safe")
+>>> pipeline.scheduler = EulerDiscreteScheduler.from_config(pipeline.scheduler.config)
+
+>>> # or
+>>> euler_scheduler = EulerDiscreteScheduler.from_pretrained("AIML-TUDA/stable-diffusion-safe", subfolder="scheduler")
+>>> pipeline = StableDiffusionPipelineSafe.from_pretrained(
+...     "AIML-TUDA/stable-diffusion-safe", scheduler=euler_scheduler
+... )
+```
+
+
+## StableDiffusionSafePipelineOutput
+[[autodoc]] pipelines.stable_diffusion_safe.StableDiffusionSafePipelineOutput
+
+## StableDiffusionPipelineSafe
+[[autodoc]] StableDiffusionPipelineSafe
+	- __call__
+	- enable_attention_slicing
+	- disable_attention_slicing
+

docs/source/api/pipelines/versatile_diffusion.mdx

@@ -0,0 +1,73 @@
+<!--Copyright 2022 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# VersatileDiffusion
+
+VersatileDiffusion was proposed in [Versatile Diffusion: Text, Images and Variations All in One Diffusion Model](https://arxiv.org/abs/2211.08332) by Xingqian Xu, Zhangyang Wang, Eric Zhang, Kai Wang, Humphrey Shi .
+
+The abstract of the paper is the following:
+
+*The recent advances in diffusion models have set an impressive milestone in many generation tasks. Trending works such as DALL-E2, Imagen, and Stable Diffusion have attracted great interest in academia and industry. Despite the rapid landscape changes, recent new approaches focus on extensions and performance rather than capacity, thus requiring separate models for separate tasks. In this work, we expand the existing single-flow diffusion pipeline into a multi-flow network, dubbed Versatile Diffusion (VD), that handles text-to-image, image-to-text, image-variation, and text-variation in one unified model. Moreover, we generalize VD to a unified multi-flow multimodal diffusion framework with grouped layers, swappable streams, and other propositions that can process modalities beyond images and text. Through our experiments, we demonstrate that VD and its underlying framework have the following merits: a) VD handles all subtasks with competitive quality; b) VD initiates novel extensions and applications such as disentanglement of style and semantic, image-text dual-guided generation, etc.; c) Through these experiments and applications, VD provides more semantic insights of the generated outputs.*
+
+## Tips
+
+- VersatileDiffusion is conceptually very similar as [Stable Diffusion](./api/pipelines/stable_diffusion),  but instead of providing just a image data stream conditioned on text, VersatileDiffusion provides both a image and text data stream and can be conditioned on both text and image.
+
+### *Run VersatileDiffusion*
+
+You can both load the memory intensive "all-in-one" [`VersatileDiffusionPipeline`] that can run all tasks 
+with the same class as shown in [`VersatileDiffusionPipeline.text_to_image`], [`VersatileDiffusionPipeline.image_variation`], and [`VersatileDiffusionPipeline.dual_guided`]
+
+**or**
+
+You can run the individual pipelines which are much more memory efficient:
+
+- *Text-to-Image*: [`VersatileDiffusionTextToImagePipeline.__call__`]
+- *Image Variation*: [`VersatileDiffusionImageVariationPipeline.__call__`]
+- *Dual Text and Image Guided Generation*: [`VersatileDiffusionDualGuidedPipeline.__call__`]
+
+### *How to load and use different schedulers.*
+
+The versatile diffusion pipelines uses [`DDIMScheduler`] scheduler by default. But `diffusers` provides many other schedulers that can be used with the alt diffusion pipeline such as [`PNDMScheduler`], [`LMSDiscreteScheduler`], [`EulerDiscreteScheduler`], [`EulerAncestralDiscreteScheduler`] etc.
+To use a different scheduler, you can either change it via the [`ConfigMixin.from_config`] method or pass the `scheduler` argument to the `from_pretrained` method of the pipeline. For example, to use the [`EulerDiscreteScheduler`], you can do the following:
+
+```python
+>>> from diffusers import VersatileDiffusionPipeline, EulerDiscreteScheduler
+
+>>> pipeline = VersatileDiffusionPipeline.from_pretrained("shi-labs/versatile-diffusion")
+>>> pipeline.scheduler = EulerDiscreteScheduler.from_config(pipeline.scheduler.config)
+
+>>> # or
+>>> euler_scheduler = EulerDiscreteScheduler.from_pretrained("shi-labs/versatile-diffusion", subfolder="scheduler")
+>>> pipeline = VersatileDiffusionPipeline.from_pretrained("shi-labs/versatile-diffusion", scheduler=euler_scheduler)
+```
+
+## VersatileDiffusionPipeline
+[[autodoc]] VersatileDiffusionPipeline
+
+## VersatileDiffusionTextToImagePipeline
+[[autodoc]] VersatileDiffusionTextToImagePipeline
+	- __call__
+	- enable_attention_slicing
+	- disable_attention_slicing
+
+## VersatileDiffusionImageVariationPipeline
+[[autodoc]] VersatileDiffusionImageVariationPipeline
+	- __call__
+	- enable_attention_slicing
+	- disable_attention_slicing
+
+## VersatileDiffusionDualGuidedPipeline
+[[autodoc]] VersatileDiffusionDualGuidedPipeline
+	- __call__
+	- enable_attention_slicing
+	- disable_attention_slicing

docs/source/api/schedulers.mdx

@@ -76,6 +76,33 @@ Original paper can be found [here](https://arxiv.org/abs/2206.00927) and the [im
 
 [[autodoc]] DPMSolverMultistepScheduler
 
+#### Heun scheduler inspired by Karras et. al paper
+
+Algorithm 1 of [Karras et. al](https://arxiv.org/abs/2206.00364).
+Scheduler ported from @crowsonkb's https://github.com/crowsonkb/k-diffusion library:
+
+All credit for making this scheduler work goes to [Katherine Crowson](https://github.com/crowsonkb/)
+
+[[autodoc]] HeunDiscreteScheduler
+
+#### DPM Discrete Scheduler inspired by Karras et. al paper
+
+Inspired by [Karras et. al](https://arxiv.org/abs/2206.00364).
+Scheduler ported from @crowsonkb's https://github.com/crowsonkb/k-diffusion library:
+
+All credit for making this scheduler work goes to [Katherine Crowson](https://github.com/crowsonkb/)
+
+[[autodoc]] KDPM2DiscreteScheduler
+
+#### DPM Discrete Scheduler with ancestral sampling inspired by Karras et. al paper
+
+Inspired by [Karras et. al](https://arxiv.org/abs/2206.00364).
+Scheduler ported from @crowsonkb's https://github.com/crowsonkb/k-diffusion library:
+
+All credit for making this scheduler work goes to [Katherine Crowson](https://github.com/crowsonkb/)
+
+[[autodoc]] KDPM2AncestralDiscreteScheduler
+
 #### Variance exploding, stochastic sampling from Karras et. al
 
 Original paper can be found [here](https://arxiv.org/abs/2006.11239).
@@ -86,7 +113,6 @@ Original paper can be found [here](https://arxiv.org/abs/2006.11239).
 
 Original implementation can be found [here](https://arxiv.org/abs/2206.00364).
 
-
 [[autodoc]] LMSDiscreteScheduler
 
 #### Pseudo numerical methods for diffusion models (PNDM)

docs/source/index.mdx

@@ -48,7 +48,14 @@ available a colab notebook to directly try them out.
 | [stable_diffusion](./api/pipelines/stable_diffusion) | [**Stable Diffusion**](https://stability.ai/blog/stable-diffusion-public-release) | Text-to-Image Generation | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/training_example.ipynb)
 | [stable_diffusion](./api/pipelines/stable_diffusion) | [**Stable Diffusion**](https://stability.ai/blog/stable-diffusion-public-release) | Image-to-Image Text-Guided Generation | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/image_2_image_using_diffusers.ipynb)
 | [stable_diffusion](./api/pipelines/stable_diffusion) | [**Stable Diffusion**](https://stability.ai/blog/stable-diffusion-public-release) | Text-Guided Image Inpainting | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/in_painting_with_stable_diffusion_using_diffusers.ipynb)
+| [stable_diffusion_2](./api/pipelines/stable_diffusion_2) | [**Stable Diffusion 2**](https://stability.ai/blog/stable-diffusion-v2-release) | Text-to-Image Generation | 
+| [stable_diffusion_2](./api/pipelines/stable_diffusion_2) | [**Stable Diffusion 2**](https://stability.ai/blog/stable-diffusion-v2-release) | Text-Guided Image Inpainting | 
+| [stable_diffusion_2](./api/pipelines/stable_diffusion_2) | [**Stable Diffusion 2**](https://stability.ai/blog/stable-diffusion-v2-release) | Text-Guided Super Resolution Image-to-Image |
+| [stable_diffusion_safe](./api/pipelines/stable_diffusion_safe) | [**Safe Stable Diffusion**](https://arxiv.org/abs/2211.05105) | Text-Guided Generation | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/ml-research/safe-latent-diffusion/blob/main/examples/Safe%20Latent%20Diffusion.ipynb)
 | [stochastic_karras_ve](./api/pipelines/stochastic_karras_ve) | [**Elucidating the Design Space of Diffusion-Based Generative Models**](https://arxiv.org/abs/2206.00364) | Unconditional Image Generation | 
+| [versatile_diffusion](./api/pipelines/versatile_diffusion) | [Versatile Diffusion: Text, Images and Variations All in One Diffusion Model](https://arxiv.org/abs/2211.08332) | Text-to-Image Generation | 
+| [versatile_diffusion](./api/pipelines/versatile_diffusion) | [Versatile Diffusion: Text, Images and Variations All in One Diffusion Model](https://arxiv.org/abs/2211.08332) | Image Variations Generation | 
+| [versatile_diffusion](./api/pipelines/versatile_diffusion) | [Versatile Diffusion: Text, Images and Variations All in One Diffusion Model](https://arxiv.org/abs/2211.08332) | Dual Image and Text Guided Generation | 
 | [vq_diffusion](./api/pipelines/vq_diffusion) | [Vector Quantized Diffusion Model for Text-to-Image Synthesis](https://arxiv.org/abs/2111.14822) | Text-to-Image Generation | 
 
 **Note**: Pipelines are simple examples of how to play around with the diffusion systems as described in the corresponding papers. 

docs/source/optimization/fp16.mdx

@@ -117,6 +117,34 @@ image = pipe(prompt).images[0]
 
 There's a small performance penalty of about 10% slower inference times, but this method allows you to use Stable Diffusion in as little as 3.2 GB of VRAM!
 
+
+## Sliced VAE decode for larger batches
+
+To decode large batches of images with limited VRAM, or to enable batches with 32 images or more, you can use sliced VAE decode that decodes the batch latents one image at a time.
+
+You likely want to couple this with [`~StableDiffusionPipeline.enable_attention_slicing`] or [`~StableDiffusionPipeline.enable_xformers_memory_efficient_attention`] to further minimize memory use.
+
+To perform the VAE decode one image at a time, invoke [`~StableDiffusionPipeline.enable_vae_slicing`] in your pipeline before inference. For example:
+
+```Python
+import torch
+from diffusers import StableDiffusionPipeline
+
+pipe = StableDiffusionPipeline.from_pretrained(
+    "runwayml/stable-diffusion-v1-5",
+    revision="fp16",
+    torch_dtype=torch.float16,
+)
+pipe = pipe.to("cuda")
+
+prompt = "a photo of an astronaut riding a horse on mars"
+pipe.enable_vae_slicing()
+images = pipe([prompt] * 32).images
+```
+
+You may see a small performance boost in VAE decode on multi-image batches. There should be no performance impact on single-image batches.
+
+
 ## Offloading to CPU with accelerate for memory savings
 
 For additional memory savings, you can offload the weights to CPU and load them to GPU when performing the forward pass.

docs/source/using-diffusers/audio.mdx

@@ -0,0 +1,16 @@
+<!--Copyright 2022 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# Using Diffusers for audio
+
+The [`DanceDiffusionPipeline`] can be used to generate audio rapidly!
+More coming soon!

docs/source/using-diffusers/loading.mdx

@@ -378,21 +378,3 @@ dpm = DPMSolverMultistepScheduler.from_pretrained(repo_id, subfolder="scheduler"
 # replace `dpm` with any of `ddpm`, `ddim`, `pndm`, `lms`, `euler`, `euler_anc`
 pipeline = StableDiffusionPipeline.from_pretrained(repo_id, scheduler=dpm)
 ```
-
-## API
-
-[[autodoc]] modeling_utils.ModelMixin
-    - from_pretrained
-    - save_pretrained
-
-[[autodoc]] pipeline_utils.DiffusionPipeline
-    - from_pretrained
-    - save_pretrained
-
-[[autodoc]] modeling_flax_utils.FlaxModelMixin
-    - from_pretrained
-    - save_pretrained
-
-[[autodoc]] pipeline_flax_utils.FlaxDiffusionPipeline
-    - from_pretrained
-    - save_pretrained

docs/source/using-diffusers/other-modalities.mdx

@@ -0,0 +1,20 @@
+<!--Copyright 2022 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# Using Diffusers with other modalities
+
+Diffusers is in the process of expanding to modalities other than images.
+
+Currently, one example is for [molecule conformation](https://www.nature.com/subjects/molecular-conformation#:~:text=Definition,to%20changes%20in%20their%20environment.) generation.
+* Generate conformations in Colab [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/geodiff_molecule_conformation.ipynb)
+
+More coming soon!

docs/source/using-diffusers/rl.mdx

@@ -0,0 +1,18 @@
+<!--Copyright 2022 The HuggingFace Team. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# Using Diffusers for reinforcement learning
+
+Support for one RL model and related pipelines is included in the `experimental` source of diffusers.
+
+To try some of this in colab, please look at the following example:
+* Model-based reinforcement learning on Colab [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/reinforcement_learning_with_diffusers.ipynb) ![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)

examples/community/README.md

@@ -21,6 +21,8 @@ If a community doesn't work as expected, please open an issue and ping the autho
 | Multilingual Stable Diffusion| Stable Diffusion Pipeline that supports prompts in 50 different languages.                                                                                                                                                                                                                                                                                                     | [Multilingual Stable Diffusion](#multilingual-stable-diffusion-pipeline)                                                                 | -                                                                                                                                                                                                                  |                        [Juan Carlos Piñeros](https://github.com/juancopi81) |
 | Image to Image Inpainting Stable Diffusion | Stable Diffusion Pipeline that enables the overlaying of two images and subsequent inpainting| [Image to Image Inpainting Stable Diffusion](#image-to-image-inpainting-stable-diffusion)                                                                 | -                                                                                                                                                                                                                  |                        [Alex McKinney](https://github.com/vvvm23) |
 | Text Based Inpainting Stable Diffusion | Stable Diffusion Inpainting Pipeline that enables passing a text prompt to generate the mask for inpainting| [Text Based Inpainting Stable Diffusion](#image-to-image-inpainting-stable-diffusion)                                                                 | -                                                                                                                                                                                                                  |                        [Dhruv Karan](https://github.com/unography) |
+| Bit Diffusion | Diffusion on discrete data | [Bit Diffusion](#bit-diffusion) | -  |[Stuti R.](https://github.com/kingstut) |
+| K-Diffusion Stable Diffusion | Run Stable Diffusion with any of [K-Diffusion's samplers](https://github.com/crowsonkb/k-diffusion/blob/master/k_diffusion/sampling.py) | [Stable Diffusion with K Diffusion](#stable-diffusion-with-k-diffusion) | -  | [Patrick von Platen](https://github.com/patrickvonplaten/) |
 
 
 
@@ -343,7 +345,6 @@ out = pipe(
 )
 ```
 
-
 ### Composable Stable diffusion 
 
 [Composable Stable Diffusion](https://energy-based-model.github.io/Compositional-Visual-Generation-with-Composable-Diffusion-Models/) proposes conjunction and negation (negative prompts) operators for compositional generation with conditional diffusion models.
@@ -370,7 +371,7 @@ def dummy(images, **kwargs):
 pipe.safety_checker = dummy
 
 images = []
-generator = th.Generator("cuda").manual_seed(0)
+generator = torch.Generator("cuda").manual_seed(0)
 
 seed = 0
 prompt = "a forest | a camel"
@@ -399,6 +400,7 @@ import requests
 from PIL import Image
 from io import BytesIO
 import torch
+import os
 from diffusers import DiffusionPipeline, DDIMScheduler
 has_cuda = torch.cuda.is_available()
 device = torch.device('cpu' if not has_cuda else 'cuda')
@@ -423,6 +425,7 @@ res = pipe.train(
     num_inference_steps=50,
     generator=generator)
 res = pipe(alpha=1)
+os.makedirs("imagic", exist_ok=True)
 image = res.images[0]
 image.save('./imagic/imagic_image_alpha_1.png')
 res = pipe(alpha=1.5)
@@ -599,7 +602,7 @@ For example, this could be used to place a logo on a shirt and make it blend sea
 import PIL
 import torch
 
-from diffusers import StableDiffusionInpaintPipeline
+from diffusers import DiffusionPipeline
 
 image_path = "./path-to-image.png"
 inner_image_path = "./path-to-inner-image.png"
@@ -609,10 +612,11 @@ init_image = PIL.Image.open(image_path).convert("RGB").resize((512, 512))
 inner_image = PIL.Image.open(inner_image_path).convert("RGBA").resize((512, 512))
 mask_image = PIL.Image.open(mask_path).convert("RGB").resize((512, 512))
 
-pipe = StableDiffusionInpaintPipeline.from_pretrained(
+pipe = DiffusionPipeline.from_pretrained(
     "runwayml/stable-diffusion-inpainting",
+    custom_pipeline="img2img_inpainting",
     revision="fp16",
-    torch_dtype=torch.float16,
+    torch_dtype=torch.float16
 )
 pipe = pipe.to("cuda")
 
@@ -620,6 +624,8 @@ prompt = "Your prompt here!"
 image = pipe(prompt=prompt, image=init_image, inner_image=inner_image, mask_image=mask_image).images[0]
 ```
 
+![2 by 2 grid demonstrating image to image inpainting.](https://user-images.githubusercontent.com/44398246/203506577-ec303be4-887e-4ebd-a773-c83fcb3dd01a.png)
+
 ### Text Based Inpainting Stable Diffusion
 
 Use a text prompt to generate the mask for the area to be inpainted.
@@ -652,4 +658,74 @@ prompt = "a cup"  # the masked out region will be replaced with this
 
 with autocast("cuda"):
     image = pipe(image=image, text=text, prompt=prompt).images[0]
-```
+```
+
+### Bit Diffusion 
+Based https://arxiv.org/abs/2208.04202, this is used for diffusion on discrete data - eg, discreate image data, DNA sequence data. An unconditional discreate image can be generated like this: 
+
+```python
+from diffusers import DiffusionPipeline
+pipe = DiffusionPipeline.from_pretrained("google/ddpm-cifar10-32", custom_pipeline="bit_diffusion")
+image = pipe().images[0]
+
+```
+
+### Stable Diffusion with K Diffusion
+
+Make sure you have @crowsonkb's https://github.com/crowsonkb/k-diffusion installed:
+
+```
+pip install k-diffusion
+```
+
+You can use the community pipeline as follows:
+
+```python
+from diffusers import DiffusionPipeline
+
+pipe = DiffusionPipeline.from_pretrained("CompVis/stable-diffusion-v1-4", custom_pipeline="sd_text2img_k_diffusion")
+pipe = pipe.to("cuda")
+
+prompt = "an astronaut riding a horse on mars"
+pipe.set_sampler("sample_heun")
+generator = torch.Generator(device="cuda").manual_seed(seed)
+image = pipe(prompt, generator=generator, num_inference_steps=20).images[0]
+
+image.save("./astronaut_heun_k_diffusion.png")
+```
+
+To make sure that K Diffusion and `diffusers` yield the same results:
+
+**Diffusers**:
+```python
+from diffusers import DiffusionPipeline, EulerDiscreteScheduler
+
+seed = 33
+
+pipe = DiffusionPipeline.from_pretrained("CompVis/stable-diffusion-v1-4")
+pipe.scheduler = EulerDiscreteScheduler.from_config(pipe.scheduler.config)
+pipe = pipe.to("cuda")
+
+generator = torch.Generator(device="cuda").manual_seed(seed)
+image = pipe(prompt, generator=generator, num_inference_steps=50).images[0]
+```
+
+![diffusers_euler](https://huggingface.co/datasets/patrickvonplaten/images/resolve/main/k_diffusion/astronaut_euler.png)
+
+**K Diffusion**:
+```python
+from diffusers import DiffusionPipeline, EulerDiscreteScheduler
+
+seed = 33
+
+pipe = DiffusionPipeline.from_pretrained("CompVis/stable-diffusion-v1-4", custom_pipeline="sd_text2img_k_diffusion")
+pipe.scheduler = EulerDiscreteScheduler.from_config(pipe.scheduler.config)
+pipe = pipe.to("cuda")
+
+pipe.set_sampler("sample_euler")
+generator = torch.Generator(device="cuda").manual_seed(seed)
+image = pipe(prompt, generator=generator, num_inference_steps=50).images[0]
+```
+
+![diffusers_euler](https://huggingface.co/datasets/patrickvonplaten/images/resolve/main/k_diffusion/astronaut_euler_k_diffusion.png)
+

examples/community/bit_diffusion.py

@@ -0,0 +1,265 @@
+from typing import Optional, Tuple, Union
+
+import torch
+
+from diffusers import DDIMScheduler, DDPMScheduler, DiffusionPipeline, UNet2DConditionModel
+from diffusers.pipeline_utils import ImagePipelineOutput
+from diffusers.schedulers.scheduling_ddim import DDIMSchedulerOutput
+from diffusers.schedulers.scheduling_ddpm import DDPMSchedulerOutput
+from einops import rearrange, reduce
+
+
+BITS = 8
+
+
+# convert to bit representations and back taken from https://github.com/lucidrains/bit-diffusion/blob/main/bit_diffusion/bit_diffusion.py
+def decimal_to_bits(x, bits=BITS):
+    """expects image tensor ranging from 0 to 1, outputs bit tensor ranging from -1 to 1"""
+    device = x.device
+
+    x = (x * 255).int().clamp(0, 255)
+
+    mask = 2 ** torch.arange(bits - 1, -1, -1, device=device)
+    mask = rearrange(mask, "d -> d 1 1")
+    x = rearrange(x, "b c h w -> b c 1 h w")
+
+    bits = ((x & mask) != 0).float()
+    bits = rearrange(bits, "b c d h w -> b (c d) h w")
+    bits = bits * 2 - 1
+    return bits
+
+
+def bits_to_decimal(x, bits=BITS):
+    """expects bits from -1 to 1, outputs image tensor from 0 to 1"""
+    device = x.device
+
+    x = (x > 0).int()
+    mask = 2 ** torch.arange(bits - 1, -1, -1, device=device, dtype=torch.int32)
+
+    mask = rearrange(mask, "d -> d 1 1")
+    x = rearrange(x, "b (c d) h w -> b c d h w", d=8)
+    dec = reduce(x * mask, "b c d h w -> b c h w", "sum")
+    return (dec / 255).clamp(0.0, 1.0)
+
+
+# modified scheduler step functions for clamping the predicted x_0 between -bit_scale and +bit_scale
+def ddim_bit_scheduler_step(
+    self,
+    model_output: torch.FloatTensor,
+    timestep: int,
+    sample: torch.FloatTensor,
+    eta: float = 0.0,
+    use_clipped_model_output: bool = True,
+    generator=None,
+    return_dict: bool = True,
+) -> Union[DDIMSchedulerOutput, Tuple]:
+    """
+    Predict the sample at the previous timestep by reversing the SDE. Core function to propagate the diffusion
+    process from the learned model outputs (most often the predicted noise).
+    Args:
+        model_output (`torch.FloatTensor`): direct output from learned diffusion model.
+        timestep (`int`): current discrete timestep in the diffusion chain.
+        sample (`torch.FloatTensor`):
+            current instance of sample being created by diffusion process.
+        eta (`float`): weight of noise for added noise in diffusion step.
+        use_clipped_model_output (`bool`): TODO
+        generator: random number generator.
+        return_dict (`bool`): option for returning tuple rather than DDIMSchedulerOutput class
+    Returns:
+        [`~schedulers.scheduling_utils.DDIMSchedulerOutput`] or `tuple`:
+        [`~schedulers.scheduling_utils.DDIMSchedulerOutput`] if `return_dict` is True, otherwise a `tuple`. When
+        returning a tuple, the first element is the sample tensor.
+    """
+    if self.num_inference_steps is None:
+        raise ValueError(
+            "Number of inference steps is 'None', you need to run 'set_timesteps' after creating the scheduler"
+        )
+
+    # See formulas (12) and (16) of DDIM paper https://arxiv.org/pdf/2010.02502.pdf
+    # Ideally, read DDIM paper in-detail understanding
+
+    # Notation (<variable name> -> <name in paper>
+    # - pred_noise_t -> e_theta(x_t, t)
+    # - pred_original_sample -> f_theta(x_t, t) or x_0
+    # - std_dev_t -> sigma_t
+    # - eta -> η
+    # - pred_sample_direction -> "direction pointing to x_t"
+    # - pred_prev_sample -> "x_t-1"
+
+    # 1. get previous step value (=t-1)
+    prev_timestep = timestep - self.config.num_train_timesteps // self.num_inference_steps
+
+    # 2. compute alphas, betas
+    alpha_prod_t = self.alphas_cumprod[timestep]
+    alpha_prod_t_prev = self.alphas_cumprod[prev_timestep] if prev_timestep >= 0 else self.final_alpha_cumprod
+
+    beta_prod_t = 1 - alpha_prod_t
+
+    # 3. compute predicted original sample from predicted noise also called
+    # "predicted x_0" of formula (12) from https://arxiv.org/pdf/2010.02502.pdf
+    pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
+
+    # 4. Clip "predicted x_0"
+    scale = self.bit_scale
+    if self.config.clip_sample:
+        pred_original_sample = torch.clamp(pred_original_sample, -scale, scale)
+
+    # 5. compute variance: "sigma_t(η)" -> see formula (16)
+    # σ_t = sqrt((1 − α_t−1)/(1 − α_t)) * sqrt(1 − α_t/α_t−1)
+    variance = self._get_variance(timestep, prev_timestep)
+    std_dev_t = eta * variance ** (0.5)
+
+    if use_clipped_model_output:
+        # the model_output is always re-derived from the clipped x_0 in Glide
+        model_output = (sample - alpha_prod_t ** (0.5) * pred_original_sample) / beta_prod_t ** (0.5)
+
+    # 6. compute "direction pointing to x_t" of formula (12) from https://arxiv.org/pdf/2010.02502.pdf
+    pred_sample_direction = (1 - alpha_prod_t_prev - std_dev_t**2) ** (0.5) * model_output
+
+    # 7. compute x_t without "random noise" of formula (12) from https://arxiv.org/pdf/2010.02502.pdf
+    prev_sample = alpha_prod_t_prev ** (0.5) * pred_original_sample + pred_sample_direction
+
+    if eta > 0:
+        # randn_like does not support generator https://github.com/pytorch/pytorch/issues/27072
+        device = model_output.device if torch.is_tensor(model_output) else "cpu"
+        noise = torch.randn(model_output.shape, dtype=model_output.dtype, generator=generator).to(device)
+        variance = self._get_variance(timestep, prev_timestep) ** (0.5) * eta * noise
+
+        prev_sample = prev_sample + variance
+
+    if not return_dict:
+        return (prev_sample,)
+
+    return DDIMSchedulerOutput(prev_sample=prev_sample, pred_original_sample=pred_original_sample)
+
+
+def ddpm_bit_scheduler_step(
+    self,
+    model_output: torch.FloatTensor,
+    timestep: int,
+    sample: torch.FloatTensor,
+    prediction_type="epsilon",
+    generator=None,
+    return_dict: bool = True,
+) -> Union[DDPMSchedulerOutput, Tuple]:
+    """
+    Predict the sample at the previous timestep by reversing the SDE. Core function to propagate the diffusion
+    process from the learned model outputs (most often the predicted noise).
+    Args:
+        model_output (`torch.FloatTensor`): direct output from learned diffusion model.
+        timestep (`int`): current discrete timestep in the diffusion chain.
+        sample (`torch.FloatTensor`):
+            current instance of sample being created by diffusion process.
+        prediction_type (`str`, default `epsilon`):
+            indicates whether the model predicts the noise (epsilon), or the samples (`sample`).
+        generator: random number generator.
+        return_dict (`bool`): option for returning tuple rather than DDPMSchedulerOutput class
+    Returns:
+        [`~schedulers.scheduling_utils.DDPMSchedulerOutput`] or `tuple`:
+        [`~schedulers.scheduling_utils.DDPMSchedulerOutput`] if `return_dict` is True, otherwise a `tuple`. When
+        returning a tuple, the first element is the sample tensor.
+    """
+    t = timestep
+
+    if model_output.shape[1] == sample.shape[1] * 2 and self.variance_type in ["learned", "learned_range"]:
+        model_output, predicted_variance = torch.split(model_output, sample.shape[1], dim=1)
+    else:
+        predicted_variance = None
+
+    # 1. compute alphas, betas
+    alpha_prod_t = self.alphas_cumprod[t]
+    alpha_prod_t_prev = self.alphas_cumprod[t - 1] if t > 0 else self.one
+    beta_prod_t = 1 - alpha_prod_t
+    beta_prod_t_prev = 1 - alpha_prod_t_prev
+
+    # 2. compute predicted original sample from predicted noise also called
+    # "predicted x_0" of formula (15) from https://arxiv.org/pdf/2006.11239.pdf
+    if prediction_type == "epsilon":
+        pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
+    elif prediction_type == "sample":
+        pred_original_sample = model_output
+    else:
+        raise ValueError(f"Unsupported prediction_type {prediction_type}.")
+
+    # 3. Clip "predicted x_0"
+    scale = self.bit_scale
+    if self.config.clip_sample:
+        pred_original_sample = torch.clamp(pred_original_sample, -scale, scale)
+
+    # 4. Compute coefficients for pred_original_sample x_0 and current sample x_t
+    # See formula (7) from https://arxiv.org/pdf/2006.11239.pdf
+    pred_original_sample_coeff = (alpha_prod_t_prev ** (0.5) * self.betas[t]) / beta_prod_t
+    current_sample_coeff = self.alphas[t] ** (0.5) * beta_prod_t_prev / beta_prod_t
+
+    # 5. Compute predicted previous sample µ_t
+    # See formula (7) from https://arxiv.org/pdf/2006.11239.pdf
+    pred_prev_sample = pred_original_sample_coeff * pred_original_sample + current_sample_coeff * sample
+
+    # 6. Add noise
+    variance = 0
+    if t > 0:
+        noise = torch.randn(
+            model_output.size(), dtype=model_output.dtype, layout=model_output.layout, generator=generator
+        ).to(model_output.device)
+        variance = (self._get_variance(t, predicted_variance=predicted_variance) ** 0.5) * noise
+
+    pred_prev_sample = pred_prev_sample + variance
+
+    if not return_dict:
+        return (pred_prev_sample,)
+
+    return DDPMSchedulerOutput(prev_sample=pred_prev_sample, pred_original_sample=pred_original_sample)
+
+
+class BitDiffusion(DiffusionPipeline):
+    def __init__(
+        self,
+        unet: UNet2DConditionModel,
+        scheduler: Union[DDIMScheduler, DDPMScheduler],
+        bit_scale: Optional[float] = 1.0,
+    ):
+        super().__init__()
+        self.bit_scale = bit_scale
+        self.scheduler.step = (
+            ddim_bit_scheduler_step if isinstance(scheduler, DDIMScheduler) else ddpm_bit_scheduler_step
+        )
+
+        self.register_modules(unet=unet, scheduler=scheduler)
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        height: Optional[int] = 256,
+        width: Optional[int] = 256,
+        num_inference_steps: Optional[int] = 50,
+        generator: Optional[torch.Generator] = None,
+        batch_size: Optional[int] = 1,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        **kwargs,
+    ) -> Union[Tuple, ImagePipelineOutput]:
+        latents = torch.randn(
+            (batch_size, self.unet.in_channels, height, width),
+            generator=generator,
+        )
+        latents = decimal_to_bits(latents) * self.bit_scale
+        latents = latents.to(self.device)
+
+        self.scheduler.set_timesteps(num_inference_steps)
+
+        for t in self.progress_bar(self.scheduler.timesteps):
+            # predict the noise residual
+            noise_pred = self.unet(latents, t).sample
+
+            # compute the previous noisy sample x_t -> x_t-1
+            latents = self.scheduler.step(noise_pred, t, latents).prev_sample
+
+        image = bits_to_decimal(latents)
+
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image,)
+
+        return ImagePipelineOutput(images=image)

examples/community/clip_guided_stable_diffusion.py

@@ -78,7 +78,12 @@ class CLIPGuidedStableDiffusion(DiffusionPipeline):
         )
 
         self.normalize = transforms.Normalize(mean=feature_extractor.image_mean, std=feature_extractor.image_std)
-        self.make_cutouts = MakeCutouts(feature_extractor.size)
+        cut_out_size = (
+            feature_extractor.size
+            if isinstance(feature_extractor.size, int)
+            else feature_extractor.size["shortest_edge"]
+        )
+        self.make_cutouts = MakeCutouts(cut_out_size)
 
         set_requires_grad(self.text_encoder, False)
         set_requires_grad(self.clip_model, False)

examples/community/imagic_stable_diffusion.py

@@ -18,12 +18,13 @@ from diffusers.pipelines.stable_diffusion import StableDiffusionPipelineOutput
 from diffusers.pipelines.stable_diffusion.safety_checker import StableDiffusionSafetyChecker
 from diffusers.schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
 from diffusers.utils import logging
+
+# TODO: remove and import from diffusers.utils when the new version of diffusers is released
+from packaging import version
 from tqdm.auto import tqdm
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 
-# TODO: remove and import from diffusers.utils when the new version of diffusers is released
-from packaging import version
 if version.parse(version.parse(PIL.__version__).base_version) >= version.parse("9.1.0"):
     PIL_INTERPOLATION = {
         "linear": PIL.Image.Resampling.BILINEAR,

examples/community/img2img_inpainting.py

@@ -110,7 +110,7 @@ class ImageToImageInpaintingPipeline(DiffusionPipeline):
             scheduler._internal_dict = FrozenDict(new_config)
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"

examples/community/interpolate_stable_diffusion.py

@@ -101,7 +101,7 @@ class StableDiffusionWalkPipeline(DiffusionPipeline):
             scheduler._internal_dict = FrozenDict(new_config)
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"

examples/community/lpw_stable_diffusion.py

@@ -13,10 +13,12 @@ from diffusers.pipelines.stable_diffusion import StableDiffusionPipelineOutput
 from diffusers.pipelines.stable_diffusion.safety_checker import StableDiffusionSafetyChecker
 from diffusers.schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
 from diffusers.utils import deprecate, is_accelerate_available, logging
-from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 # TODO: remove and import from diffusers.utils when the new version of diffusers is released
 from packaging import version
+from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
+
+
 if version.parse(version.parse(PIL.__version__).base_version) >= version.parse("9.1.0"):
     PIL_INTERPOLATION = {
         "linear": PIL.Image.Resampling.BILINEAR,
@@ -467,7 +469,7 @@ class StableDiffusionLongPromptWeightingPipeline(DiffusionPipeline):
             scheduler._internal_dict = FrozenDict(new_config)
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"

examples/community/lpw_stable_diffusion_onnx.py

@@ -11,10 +11,12 @@ from diffusers.pipeline_utils import DiffusionPipeline
 from diffusers.pipelines.stable_diffusion import StableDiffusionPipelineOutput
 from diffusers.schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
 from diffusers.utils import logging
-from transformers import CLIPFeatureExtractor, CLIPTokenizer
 
 # TODO: remove and import from diffusers.utils when the new version of diffusers is released
 from packaging import version
+from transformers import CLIPFeatureExtractor, CLIPTokenizer
+
+
 if version.parse(version.parse(PIL.__version__).base_version) >= version.parse("9.1.0"):
     PIL_INTERPOLATION = {
         "linear": PIL.Image.Resampling.BILINEAR,

examples/community/multilingual_stable_diffusion.py

@@ -113,7 +113,7 @@ class MultilingualStableDiffusion(DiffusionPipeline):
             scheduler._internal_dict = FrozenDict(new_config)
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"

examples/community/sd_text2img_k_diffusion.py

@@ -0,0 +1,479 @@
+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import importlib
+from typing import Callable, List, Optional, Union
+
+import torch
+
+from diffusers import LMSDiscreteScheduler
+from diffusers.pipeline_utils import DiffusionPipeline
+from diffusers.pipelines.stable_diffusion import StableDiffusionPipelineOutput
+from diffusers.utils import is_accelerate_available, logging
+from k_diffusion.external import CompVisDenoiser
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+class ModelWrapper:
+    def __init__(self, model, alphas_cumprod):
+        self.model = model
+        self.alphas_cumprod = alphas_cumprod
+
+    def apply_model(self, *args, **kwargs):
+        return self.model(*args, **kwargs).sample
+
+
+class StableDiffusionPipeline(DiffusionPipeline):
+    r"""
+    Pipeline for text-to-image generation using Stable Diffusion.
+
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Args:
+        vae ([`AutoencoderKL`]):
+            Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
+        text_encoder ([`CLIPTextModel`]):
+            Frozen text-encoder. Stable Diffusion uses the text portion of
+            [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically
+            the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
+        tokenizer (`CLIPTokenizer`):
+            Tokenizer of class
+            [CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+        safety_checker ([`StableDiffusionSafetyChecker`]):
+            Classification module that estimates whether generated images could be considered offensive or harmful.
+            Please, refer to the [model card](https://huggingface.co/runwayml/stable-diffusion-v1-5) for details.
+        feature_extractor ([`CLIPFeatureExtractor`]):
+            Model that extracts features from generated images to be used as inputs for the `safety_checker`.
+    """
+
+    def __init__(
+        self,
+        vae,
+        text_encoder,
+        tokenizer,
+        unet,
+        scheduler,
+        safety_checker,
+        feature_extractor,
+    ):
+        super().__init__()
+
+        if safety_checker is None:
+            logger.warning(
+                f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
+                " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
+                " results in services or applications open to the public. Both the diffusers team and Hugging Face"
+                " strongly recommend to keep the safety filter enabled in all public facing circumstances, disabling"
+                " it only for use-cases that involve analyzing network behavior or auditing its results. For more"
+                " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
+            )
+
+        # get correct sigmas from LMS
+        scheduler = LMSDiscreteScheduler.from_config(scheduler.config)
+        self.register_modules(
+            vae=vae,
+            text_encoder=text_encoder,
+            tokenizer=tokenizer,
+            unet=unet,
+            scheduler=scheduler,
+            safety_checker=safety_checker,
+            feature_extractor=feature_extractor,
+        )
+
+        model = ModelWrapper(unet, scheduler.alphas_cumprod)
+        self.k_diffusion_model = CompVisDenoiser(model)
+
+    def set_sampler(self, scheduler_type: str):
+        library = importlib.import_module("k_diffusion")
+        sampling = getattr(library, "sampling")
+        self.sampler = getattr(sampling, scheduler_type)
+
+    def enable_xformers_memory_efficient_attention(self):
+        r"""
+        Enable memory efficient attention as implemented in xformers.
+
+        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
+        time. Speed up at training time is not guaranteed.
+
+        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
+        is used.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(True)
+
+    def disable_xformers_memory_efficient_attention(self):
+        r"""
+        Disable memory efficient attention as implemented in xformers.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(False)
+
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            # half the attention head size is usually a good trade-off between
+            # speed and memory
+            slice_size = self.unet.config.attention_head_dim // 2
+        self.unet.set_attention_slice(slice_size)
+
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    def enable_sequential_cpu_offload(self, gpu_id=0):
+        r"""
+        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
+        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
+        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
+        """
+        if is_accelerate_available():
+            from accelerate import cpu_offload
+        else:
+            raise ImportError("Please install accelerate via `pip install accelerate`")
+
+        device = torch.device(f"cuda:{gpu_id}")
+
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+            if cpu_offloaded_model is not None:
+                cpu_offload(cpu_offloaded_model, device)
+
+    @property
+    def _execution_device(self):
+        r"""
+        Returns the device on which the pipeline's models will be executed. After calling
+        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
+        hooks.
+        """
+        if self.device != torch.device("meta") or not hasattr(self.unet, "_hf_hook"):
+            return self.device
+        for module in self.unet.modules():
+            if (
+                hasattr(module, "_hf_hook")
+                and hasattr(module._hf_hook, "execution_device")
+                and module._hf_hook.execution_device is not None
+            ):
+                return torch.device(module._hf_hook.execution_device)
+        return self.device
+
+    def _encode_prompt(self, prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            device: (`torch.device`):
+                torch device
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+            negative_prompt (`str` or `List[str]`):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+        """
+        batch_size = len(prompt) if isinstance(prompt, list) else 1
+
+        text_inputs = self.tokenizer(
+            prompt,
+            padding="max_length",
+            max_length=self.tokenizer.model_max_length,
+            truncation=True,
+            return_tensors="pt",
+        )
+        text_input_ids = text_inputs.input_ids
+        untruncated_ids = self.tokenizer(prompt, padding="max_length", return_tensors="pt").input_ids
+
+        if not torch.equal(text_input_ids, untruncated_ids):
+            removed_text = self.tokenizer.batch_decode(untruncated_ids[:, self.tokenizer.model_max_length - 1 : -1])
+            logger.warning(
+                "The following part of your input was truncated because CLIP can only handle sequences up to"
+                f" {self.tokenizer.model_max_length} tokens: {removed_text}"
+            )
+
+        if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+            attention_mask = text_inputs.attention_mask.to(device)
+        else:
+            attention_mask = None
+
+        text_embeddings = self.text_encoder(
+            text_input_ids.to(device),
+            attention_mask=attention_mask,
+        )
+        text_embeddings = text_embeddings[0]
+
+        # duplicate text embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = text_embeddings.shape
+        text_embeddings = text_embeddings.repeat(1, num_images_per_prompt, 1)
+        text_embeddings = text_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_tokens: List[str]
+            if negative_prompt is None:
+                uncond_tokens = [""] * batch_size
+            elif type(prompt) is not type(negative_prompt):
+                raise TypeError(
+                    f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
+                    f" {type(prompt)}."
+                )
+            elif isinstance(negative_prompt, str):
+                uncond_tokens = [negative_prompt]
+            elif batch_size != len(negative_prompt):
+                raise ValueError(
+                    f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:"
+                    f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches"
+                    " the batch size of `prompt`."
+                )
+            else:
+                uncond_tokens = negative_prompt
+
+            max_length = text_input_ids.shape[-1]
+            uncond_input = self.tokenizer(
+                uncond_tokens,
+                padding="max_length",
+                max_length=max_length,
+                truncation=True,
+                return_tensors="pt",
+            )
+
+            if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+                attention_mask = uncond_input.attention_mask.to(device)
+            else:
+                attention_mask = None
+
+            uncond_embeddings = self.text_encoder(
+                uncond_input.input_ids.to(device),
+                attention_mask=attention_mask,
+            )
+            uncond_embeddings = uncond_embeddings[0]
+
+            # duplicate unconditional embeddings for each generation per prompt, using mps friendly method
+            seq_len = uncond_embeddings.shape[1]
+            uncond_embeddings = uncond_embeddings.repeat(1, num_images_per_prompt, 1)
+            uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and text embeddings into a single batch
+            # to avoid doing two forward passes
+            text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
+
+        return text_embeddings
+
+    def run_safety_checker(self, image, device, dtype):
+        if self.safety_checker is not None:
+            safety_checker_input = self.feature_extractor(self.numpy_to_pil(image), return_tensors="pt").to(device)
+            image, has_nsfw_concept = self.safety_checker(
+                images=image, clip_input=safety_checker_input.pixel_values.to(dtype)
+            )
+        else:
+            has_nsfw_concept = None
+        return image, has_nsfw_concept
+
+    def decode_latents(self, latents):
+        latents = 1 / 0.18215 * latents
+        image = self.vae.decode(latents).sample
+        image = (image / 2 + 0.5).clamp(0, 1)
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
+        return image
+
+    def check_inputs(self, prompt, height, width, callback_steps):
+        if not isinstance(prompt, str) and not isinstance(prompt, list):
+            raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
+
+        if height % 8 != 0 or width % 8 != 0:
+            raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+    def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
+        shape = (batch_size, num_channels_latents, height // 8, width // 8)
+        if latents is None:
+            if device.type == "mps":
+                # randn does not work reproducibly on mps
+                latents = torch.randn(shape, generator=generator, device="cpu", dtype=dtype).to(device)
+            else:
+                latents = torch.randn(shape, generator=generator, device=device, dtype=dtype)
+        else:
+            if latents.shape != shape:
+                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {shape}")
+            latents = latents.to(device)
+
+        # scale the initial noise by the standard deviation required by the scheduler
+        return latents
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        prompt: Union[str, List[str]],
+        height: int = 512,
+        width: int = 512,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+        **kwargs,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to 512):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to 512):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+
+        # 1. Check inputs. Raise error if not correct
+        self.check_inputs(prompt, height, width, callback_steps)
+
+        # 2. Define call parameters
+        batch_size = 1 if isinstance(prompt, str) else len(prompt)
+        device = self._execution_device
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = True
+        if guidance_scale <= 1.0:
+            raise ValueError("has to use guidance_scale")
+
+        # 3. Encode input prompt
+        text_embeddings = self._encode_prompt(
+            prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt
+        )
+
+        # 4. Prepare timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=text_embeddings.device)
+        sigmas = self.scheduler.sigmas
+
+        # 5. Prepare latent variables
+        num_channels_latents = self.unet.in_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            text_embeddings.dtype,
+            device,
+            generator,
+            latents,
+        )
+        latents = latents * sigmas[0]
+        self.k_diffusion_model.sigmas = self.k_diffusion_model.sigmas.to(latents.device)
+        self.k_diffusion_model.log_sigmas = self.k_diffusion_model.log_sigmas.to(latents.device)
+
+        def model_fn(x, t):
+            latent_model_input = torch.cat([x] * 2)
+
+            noise_pred = self.k_diffusion_model(latent_model_input, t, encoder_hidden_states=text_embeddings)
+
+            noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+            noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+            return noise_pred
+
+        latents = self.sampler(model_fn, latents, sigmas)
+
+        # 8. Post-processing
+        image = self.decode_latents(latents)
+
+        # 9. Run safety checker
+        image, has_nsfw_concept = self.run_safety_checker(image, device, text_embeddings.dtype)
+
+        # 10. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image, has_nsfw_concept)
+
+        return StableDiffusionPipelineOutput(images=image, nsfw_content_detected=has_nsfw_concept)

examples/community/speech_to_image_diffusion.py

@@ -42,7 +42,7 @@ class SpeechToImagePipeline(DiffusionPipeline):
         super().__init__()
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"

examples/community/text_inpainting.py

@@ -99,7 +99,7 @@ class TextInpainting(DiffusionPipeline):
             scheduler._internal_dict = FrozenDict(new_config)
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"

examples/community/wildcard_stable_diffusion.py

@@ -135,7 +135,7 @@ class WildcardStableDiffusionPipeline(DiffusionPipeline):
             scheduler._internal_dict = FrozenDict(new_config)
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"

examples/dreambooth/README.md

@@ -39,6 +39,8 @@ Now let's get our dataset. Download images from [here](https://drive.google.com/
 
 And launch the training using
 
+**___Note: Change the `resolution` to 768 if you are using the [stable-diffusion-2](https://huggingface.co/stabilityai/stable-diffusion-2) 768x768 model.___**
+
 ```bash
 export MODEL_NAME="CompVis/stable-diffusion-v1-4"
 export INSTANCE_DIR="path-to-instance-images"
@@ -141,7 +143,7 @@ export INSTANCE_DIR="path-to-instance-images"
 export CLASS_DIR="path-to-class-images"
 export OUTPUT_DIR="path-to-save-model"
 
-accelerate launch train_dreambooth.py \
+accelerate launch --mixed_precision="fp16" train_dreambooth.py \
   --pretrained_model_name_or_path=$MODEL_NAME \
   --instance_data_dir=$INSTANCE_DIR \
   --class_data_dir=$CLASS_DIR \
@@ -157,8 +159,7 @@ accelerate launch train_dreambooth.py \
   --lr_scheduler="constant" \
   --lr_warmup_steps=0 \
   --num_class_images=200 \
-  --max_train_steps=800 \
-  --mixed_precision=fp16
+  --max_train_steps=800
 ```
 
 ### Fine-tune text encoder with the UNet.
@@ -194,6 +195,17 @@ accelerate launch train_dreambooth.py \
   --max_train_steps=800
 ```
 
+### Using DreamBooth for other pipelines than Stable Diffusion
+
+Altdiffusion also support dreambooth now, the runing comman is basically the same as abouve, all you need to do is replace the `MODEL_NAME` like this:
+One can now simply change the `pretrained_model_name_or_path` to another architecture such as [`AltDiffusion`](https://huggingface.co/docs/diffusers/api/pipelines/alt_diffusion).
+
+```
+export MODEL_NAME="CompVis/stable-diffusion-v1-4" --> export MODEL_NAME="BAAI/AltDiffusion-m9"
+or
+export MODEL_NAME="CompVis/stable-diffusion-v1-4" --> export MODEL_NAME="BAAI/AltDiffusion"
+```
+
 ### Inference
 
 Once you have trained a model using above command, the inference can be done simply using the `StableDiffusionPipeline`. Make sure to include the `identifier`(e.g. sks in above example) in your prompt.

examples/dreambooth/train_dreambooth.py

@@ -14,18 +14,38 @@ from torch.utils.data import Dataset
 from accelerate import Accelerator
 from accelerate.logging import get_logger
 from accelerate.utils import set_seed
-from diffusers import AutoencoderKL, DDPMScheduler, StableDiffusionPipeline, UNet2DConditionModel
+from diffusers import AutoencoderKL, DDPMScheduler, DiffusionPipeline, UNet2DConditionModel
 from diffusers.optimization import get_scheduler
 from huggingface_hub import HfFolder, Repository, whoami
 from PIL import Image
 from torchvision import transforms
 from tqdm.auto import tqdm
-from transformers import CLIPTextModel, CLIPTokenizer
+from transformers import AutoTokenizer, PretrainedConfig
 
 
 logger = get_logger(__name__)
 
 
+def import_model_class_from_model_name_or_path(pretrained_model_name_or_path: str):
+    text_encoder_config = PretrainedConfig.from_pretrained(
+        pretrained_model_name_or_path,
+        subfolder="text_encoder",
+        revision=args.revision,
+    )
+    model_class = text_encoder_config.architectures[0]
+
+    if model_class == "CLIPTextModel":
+        from transformers import CLIPTextModel
+
+        return CLIPTextModel
+    elif model_class == "RobertaSeriesModelWithTransformation":
+        from diffusers.pipelines.alt_diffusion.modeling_roberta_series import RobertaSeriesModelWithTransformation
+
+        return RobertaSeriesModelWithTransformation
+    else:
+        raise ValueError(f"{model_class} is not supported.")
+
+
 def parse_args(input_args=None):
     parser = argparse.ArgumentParser(description="Simple example of a training script.")
     parser.add_argument(
@@ -124,6 +144,7 @@ def parse_args(input_args=None):
         default=None,
         help="Total number of training steps to perform.  If provided, overrides num_train_epochs.",
     )
+    parser.add_argument("--save_steps", type=int, default=500, help="Save checkpoint every X updates steps.")
     parser.add_argument(
         "--gradient_accumulation_steps",
         type=int,
@@ -187,12 +208,12 @@ def parse_args(input_args=None):
     parser.add_argument(
         "--mixed_precision",
         type=str,
-        default="no",
+        default=None,
         choices=["no", "fp16", "bf16"],
         help=(
-            "Whether to use mixed precision. Choose"
-            "between fp16 and bf16 (bfloat16). Bf16 requires PyTorch >= 1.10."
-            "and an Nvidia Ampere GPU."
+            "Whether to use mixed precision. Choose between fp16 and bf16 (bfloat16). Bf16 requires PyTorch >="
+            " 1.10.and an Nvidia Ampere GPU.  Default to the value of accelerate config of the current system or the"
+            " flag passed with the `accelerate.launch` command. Use this argument to override the accelerate config."
         ),
     )
     parser.add_argument("--local_rank", type=int, default=-1, help="For distributed training: local_rank")
@@ -356,7 +377,7 @@ def main(args):
 
         if cur_class_images < args.num_class_images:
             torch_dtype = torch.float16 if accelerator.device.type == "cuda" else torch.float32
-            pipeline = StableDiffusionPipeline.from_pretrained(
+            pipeline = DiffusionPipeline.from_pretrained(
                 args.pretrained_model_name_or_path,
                 torch_dtype=torch_dtype,
                 safety_checker=None,
@@ -406,19 +427,24 @@ def main(args):
 
     # Load the tokenizer
     if args.tokenizer_name:
-        tokenizer = CLIPTokenizer.from_pretrained(
+        tokenizer = AutoTokenizer.from_pretrained(
             args.tokenizer_name,
             revision=args.revision,
+            use_fast=False,
         )
     elif args.pretrained_model_name_or_path:
-        tokenizer = CLIPTokenizer.from_pretrained(
+        tokenizer = AutoTokenizer.from_pretrained(
             args.pretrained_model_name_or_path,
             subfolder="tokenizer",
             revision=args.revision,
+            use_fast=False,
         )
 
+    # import correct text encoder class
+    text_encoder_cls = import_model_class_from_model_name_or_path(args.pretrained_model_name_or_path)
+
     # Load models and create wrapper for stable diffusion
-    text_encoder = CLIPTextModel.from_pretrained(
+    text_encoder = text_encoder_cls.from_pretrained(
         args.pretrained_model_name_or_path,
         subfolder="text_encoder",
         revision=args.revision,
@@ -472,7 +498,7 @@ def main(args):
         eps=args.adam_epsilon,
     )
 
-    noise_scheduler = DDPMScheduler.from_config("CompVis/stable-diffusion-v1-4", subfolder="scheduler")
+    noise_scheduler = DDPMScheduler.from_config(args.pretrained_model_name_or_path, subfolder="scheduler")
 
     train_dataset = DreamBoothDataset(
         instance_data_root=args.instance_data_dir,
@@ -538,9 +564,9 @@ def main(args):
         )
 
     weight_dtype = torch.float32
-    if args.mixed_precision == "fp16":
+    if accelerator.mixed_precision == "fp16":
         weight_dtype = torch.float16
-    elif args.mixed_precision == "bf16":
+    elif accelerator.mixed_precision == "bf16":
         weight_dtype = torch.bfloat16
 
     # Move text_encode and vae to gpu.
@@ -603,23 +629,31 @@ def main(args):
                 encoder_hidden_states = text_encoder(batch["input_ids"])[0]
 
                 # Predict the noise residual
-                noise_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
+                model_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
+
+                # Get the target for loss depending on the prediction type
+                if noise_scheduler.config.prediction_type == "epsilon":
+                    target = noise
+                elif noise_scheduler.config.prediction_type == "v_prediction":
+                    target = noise_scheduler.get_velocity(latents, noise, timesteps)
+                else:
+                    raise ValueError(f"Unknown prediction type {noise_scheduler.config.prediction_type}")
 
                 if args.with_prior_preservation:
-                    # Chunk the noise and noise_pred into two parts and compute the loss on each part separately.
-                    noise_pred, noise_pred_prior = torch.chunk(noise_pred, 2, dim=0)
-                    noise, noise_prior = torch.chunk(noise, 2, dim=0)
+                    # Chunk the noise and model_pred into two parts and compute the loss on each part separately.
+                    model_pred, model_pred_prior = torch.chunk(model_pred, 2, dim=0)
+                    target, target_prior = torch.chunk(target, 2, dim=0)
 
                     # Compute instance loss
-                    loss = F.mse_loss(noise_pred.float(), noise.float(), reduction="none").mean([1, 2, 3]).mean()
+                    loss = F.mse_loss(model_pred.float(), target.float(), reduction="none").mean([1, 2, 3]).mean()
 
                     # Compute prior loss
-                    prior_loss = F.mse_loss(noise_pred_prior.float(), noise_prior.float(), reduction="mean")
+                    prior_loss = F.mse_loss(model_pred_prior.float(), target_prior.float(), reduction="mean")
 
                     # Add the prior loss to the instance loss.
                     loss = loss + args.prior_loss_weight * prior_loss
                 else:
-                    loss = F.mse_loss(noise_pred.float(), noise.float(), reduction="mean")
+                    loss = F.mse_loss(model_pred.float(), target.float(), reduction="mean")
 
                 accelerator.backward(loss)
                 if accelerator.sync_gradients:
@@ -638,6 +672,17 @@ def main(args):
                 progress_bar.update(1)
                 global_step += 1
 
+                if global_step % args.save_steps == 0:
+                    if accelerator.is_main_process:
+                        pipeline = DiffusionPipeline.from_pretrained(
+                            args.pretrained_model_name_or_path,
+                            unet=accelerator.unwrap_model(unet),
+                            text_encoder=accelerator.unwrap_model(text_encoder),
+                            revision=args.revision,
+                        )
+                        save_path = os.path.join(args.output_dir, f"checkpoint-{global_step}")
+                        pipeline.save_pretrained(save_path)
+
             logs = {"loss": loss.detach().item(), "lr": lr_scheduler.get_last_lr()[0]}
             progress_bar.set_postfix(**logs)
             accelerator.log(logs, step=global_step)
@@ -649,7 +694,7 @@ def main(args):
 
     # Create the pipeline using using the trained modules and save it.
     if accelerator.is_main_process:
-        pipeline = StableDiffusionPipeline.from_pretrained(
+        pipeline = DiffusionPipeline.from_pretrained(
             args.pretrained_model_name_or_path,
             unet=accelerator.unwrap_model(unet),
             text_encoder=accelerator.unwrap_model(text_encoder),

examples/text_to_image/README.md

@@ -42,11 +42,13 @@ If you have already cloned the repo, then you won't need to go through these ste
 #### Hardware
 With `gradient_checkpointing` and `mixed_precision` it should be possible to fine tune the model on a single 24GB GPU. For higher `batch_size` and faster training it's better to use GPUs with >30GB memory.
 
+**___Note: Change the `resolution` to 768 if you are using the [stable-diffusion-2](https://huggingface.co/stabilityai/stable-diffusion-2) 768x768 model.___**
+
 ```bash
 export MODEL_NAME="CompVis/stable-diffusion-v1-4"
 export dataset_name="lambdalabs/pokemon-blip-captions"
 
-accelerate launch train_text_to_image.py \
+accelerate launch --mixed_precision="fp16"  train_text_to_image.py \
   --pretrained_model_name_or_path=$MODEL_NAME \
   --dataset_name=$dataset_name \
   --use_ema \
@@ -54,7 +56,6 @@ accelerate launch train_text_to_image.py \
   --train_batch_size=1 \
   --gradient_accumulation_steps=4 \
   --gradient_checkpointing \
-  --mixed_precision="fp16" \
   --max_train_steps=15000 \
   --learning_rate=1e-05 \
   --max_grad_norm=1 \
@@ -70,7 +71,7 @@ If you wish to use custom loading logic, you should modify the script, we have l
 export MODEL_NAME="CompVis/stable-diffusion-v1-4"
 export TRAIN_DIR="path_to_your_dataset"
 
-accelerate launch train_text_to_image.py \
+accelerate launch --mixed_precision="fp16" train_text_to_image.py \
   --pretrained_model_name_or_path=$MODEL_NAME \
   --train_data_dir=$TRAIN_DIR \
   --use_ema \
@@ -78,7 +79,6 @@ accelerate launch train_text_to_image.py \
   --train_batch_size=1 \
   --gradient_accumulation_steps=4 \
   --gradient_checkpointing \
-  --mixed_precision="fp16" \
   --max_train_steps=15000 \
   --learning_rate=1e-05 \
   --max_grad_norm=1 \

examples/text_to_image/train_text_to_image.py

@@ -15,13 +15,12 @@ from accelerate import Accelerator
 from accelerate.logging import get_logger
 from accelerate.utils import set_seed
 from datasets import load_dataset
-from diffusers import AutoencoderKL, DDPMScheduler, PNDMScheduler, StableDiffusionPipeline, UNet2DConditionModel
+from diffusers import AutoencoderKL, DDPMScheduler, StableDiffusionPipeline, UNet2DConditionModel
 from diffusers.optimization import get_scheduler
-from diffusers.pipelines.stable_diffusion import StableDiffusionSafetyChecker
 from huggingface_hub import HfFolder, Repository, whoami
 from torchvision import transforms
 from tqdm.auto import tqdm
-from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
+from transformers import CLIPTextModel, CLIPTokenizer
 
 
 logger = get_logger(__name__)
@@ -36,6 +35,13 @@ def parse_args():
         required=True,
         help="Path to pretrained model or model identifier from huggingface.co/models.",
     )
+    parser.add_argument(
+        "--revision",
+        type=str,
+        default=None,
+        required=False,
+        help="Revision of pretrained model identifier from huggingface.co/models.",
+    )
     parser.add_argument(
         "--dataset_name",
         type=str,
@@ -186,12 +192,12 @@ def parse_args():
     parser.add_argument(
         "--mixed_precision",
         type=str,
-        default="no",
+        default=None,
         choices=["no", "fp16", "bf16"],
         help=(
-            "Whether to use mixed precision. Choose"
-            "between fp16 and bf16 (bfloat16). Bf16 requires PyTorch >= 1.10."
-            "and an Nvidia Ampere GPU."
+            "Whether to use mixed precision. Choose between fp16 and bf16 (bfloat16). Bf16 requires PyTorch >="
+            " 1.10.and an Nvidia Ampere GPU.  Default to the value of accelerate config of the current system or the"
+            " flag passed with the `accelerate.launch` command. Use this argument to override the accelerate config."
         ),
     )
     parser.add_argument(
@@ -335,10 +341,24 @@ def main():
             os.makedirs(args.output_dir, exist_ok=True)
 
     # Load models and create wrapper for stable diffusion
-    tokenizer = CLIPTokenizer.from_pretrained(args.pretrained_model_name_or_path, subfolder="tokenizer")
-    text_encoder = CLIPTextModel.from_pretrained(args.pretrained_model_name_or_path, subfolder="text_encoder")
-    vae = AutoencoderKL.from_pretrained(args.pretrained_model_name_or_path, subfolder="vae")
-    unet = UNet2DConditionModel.from_pretrained(args.pretrained_model_name_or_path, subfolder="unet")
+    tokenizer = CLIPTokenizer.from_pretrained(
+        args.pretrained_model_name_or_path, subfolder="tokenizer", revision=args.revision
+    )
+    text_encoder = CLIPTextModel.from_pretrained(
+        args.pretrained_model_name_or_path,
+        subfolder="text_encoder",
+        revision=args.revision,
+    )
+    vae = AutoencoderKL.from_pretrained(
+        args.pretrained_model_name_or_path,
+        subfolder="vae",
+        revision=args.revision,
+    )
+    unet = UNet2DConditionModel.from_pretrained(
+        args.pretrained_model_name_or_path,
+        subfolder="unet",
+        revision=args.revision,
+    )
 
     # Freeze vae and text_encoder
     vae.requires_grad_(False)
@@ -372,7 +392,7 @@ def main():
         weight_decay=args.adam_weight_decay,
         eps=args.adam_epsilon,
     )
-    noise_scheduler = DDPMScheduler.from_config("CompVis/stable-diffusion-v1-4", subfolder="scheduler")
+    noise_scheduler = DDPMScheduler.from_config(args.pretrained_model_name_or_path, subfolder="scheduler")
 
     # Get the datasets: you can either provide your own training and evaluation files (see below)
     # or specify a Dataset from the hub (the dataset will be downloaded automatically from the datasets Hub).
@@ -496,9 +516,9 @@ def main():
     )
 
     weight_dtype = torch.float32
-    if args.mixed_precision == "fp16":
+    if accelerator.mixed_precision == "fp16":
         weight_dtype = torch.float16
-    elif args.mixed_precision == "bf16":
+    elif accelerator.mixed_precision == "bf16":
         weight_dtype = torch.bfloat16
 
     # Move text_encode and vae to gpu.
@@ -562,9 +582,17 @@ def main():
                 # Get the text embedding for conditioning
                 encoder_hidden_states = text_encoder(batch["input_ids"])[0]
 
+                # Get the target for loss depending on the prediction type
+                if noise_scheduler.config.prediction_type == "epsilon":
+                    target = noise
+                elif noise_scheduler.config.prediction_type == "v_prediction":
+                    target = noise_scheduler.get_velocity(latents, noise, timesteps)
+                else:
+                    raise ValueError(f"Unknown prediction type {noise_scheduler.config.prediction_type}")
+
                 # Predict the noise residual and compute loss
-                noise_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
-                loss = F.mse_loss(noise_pred.float(), noise.float(), reduction="mean")
+                model_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
+                loss = F.mse_loss(model_pred.float(), target.float(), reduction="mean")
 
                 # Gather the losses across all processes for logging (if we use distributed training).
                 avg_loss = accelerator.gather(loss.repeat(args.train_batch_size)).mean()
@@ -600,14 +628,12 @@ def main():
         if args.use_ema:
             ema_unet.copy_to(unet.parameters())
 
-        pipeline = StableDiffusionPipeline(
+        pipeline = StableDiffusionPipeline.from_pretrained(
+            args.pretrained_model_name_or_path,
             text_encoder=text_encoder,
             vae=vae,
             unet=unet,
-            tokenizer=tokenizer,
-            scheduler=PNDMScheduler.from_config("CompVis/stable-diffusion-v1-4", subfolder="scheduler"),
-            safety_checker=StableDiffusionSafetyChecker.from_pretrained("CompVis/stable-diffusion-safety-checker"),
-            feature_extractor=CLIPFeatureExtractor.from_pretrained("openai/clip-vit-base-patch32"),
+            revision=args.revision,
         )
         pipeline.save_pretrained(args.output_dir)
 

examples/textual_inversion/README.md

@@ -47,6 +47,8 @@ Now let's get our dataset.Download 3-4 images from [here](https://drive.google.c
 
 And launch the training using
 
+**___Note: Change the `resolution` to 768 if you are using the [stable-diffusion-2](https://huggingface.co/stabilityai/stable-diffusion-2) 768x768 model.___**
+
 ```bash
 export MODEL_NAME="runwayml/stable-diffusion-v1-5"
 export DATA_DIR="path-to-dir-containing-images"

examples/textual_inversion/textual_inversion.py

@@ -12,21 +12,22 @@ import torch.nn.functional as F
 import torch.utils.checkpoint
 from torch.utils.data import Dataset
 
+import PIL
 from accelerate import Accelerator
 from accelerate.logging import get_logger
 from accelerate.utils import set_seed
-from diffusers import AutoencoderKL, DDPMScheduler, PNDMScheduler, StableDiffusionPipeline, UNet2DConditionModel
+from diffusers import AutoencoderKL, DDPMScheduler, StableDiffusionPipeline, UNet2DConditionModel
 from diffusers.optimization import get_scheduler
-from diffusers.pipelines.stable_diffusion import StableDiffusionSafetyChecker
 from huggingface_hub import HfFolder, Repository, whoami
-from PIL import Image
-from torchvision import transforms
-from tqdm.auto import tqdm
-from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 # TODO: remove and import from diffusers.utils when the new version of diffusers is released
 from packaging import version
-import PIL
+from PIL import Image
+from torchvision import transforms
+from tqdm.auto import tqdm
+from transformers import CLIPTextModel, CLIPTokenizer
+
+
 if version.parse(version.parse(PIL.__version__).base_version) >= version.parse("9.1.0"):
     PIL_INTERPOLATION = {
         "linear": PIL.Image.Resampling.BILINEAR,
@@ -49,11 +50,11 @@ else:
 logger = get_logger(__name__)
 
 
-def save_progress(text_encoder, placeholder_token_id, accelerator, args):
+def save_progress(text_encoder, placeholder_token_id, accelerator, args, save_path):
     logger.info("Saving embeddings")
     learned_embeds = accelerator.unwrap_model(text_encoder).get_input_embeddings().weight[placeholder_token_id]
     learned_embeds_dict = {args.placeholder_token: learned_embeds.detach().cpu()}
-    torch.save(learned_embeds_dict, os.path.join(args.output_dir, "learned_embeds.bin"))
+    torch.save(learned_embeds_dict, save_path)
 
 
 def parse_args():
@@ -71,6 +72,13 @@ def parse_args():
         required=True,
         help="Path to pretrained model or model identifier from huggingface.co/models.",
     )
+    parser.add_argument(
+        "--revision",
+        type=str,
+        default=None,
+        required=False,
+        help="Revision of pretrained model identifier from huggingface.co/models.",
+    )
     parser.add_argument(
         "--tokenizer_name",
         type=str,
@@ -403,9 +411,21 @@ def main():
     placeholder_token_id = tokenizer.convert_tokens_to_ids(args.placeholder_token)
 
     # Load models and create wrapper for stable diffusion
-    text_encoder = CLIPTextModel.from_pretrained(args.pretrained_model_name_or_path, subfolder="text_encoder")
-    vae = AutoencoderKL.from_pretrained(args.pretrained_model_name_or_path, subfolder="vae")
-    unet = UNet2DConditionModel.from_pretrained(args.pretrained_model_name_or_path, subfolder="unet")
+    text_encoder = CLIPTextModel.from_pretrained(
+        args.pretrained_model_name_or_path,
+        subfolder="text_encoder",
+        revision=args.revision,
+    )
+    vae = AutoencoderKL.from_pretrained(
+        args.pretrained_model_name_or_path,
+        subfolder="vae",
+        revision=args.revision,
+    )
+    unet = UNet2DConditionModel.from_pretrained(
+        args.pretrained_model_name_or_path,
+        subfolder="unet",
+        revision=args.revision,
+    )
 
     # Resize the token embeddings as we are adding new special tokens to the tokenizer
     text_encoder.resize_token_embeddings(len(tokenizer))
@@ -439,7 +459,7 @@ def main():
         eps=args.adam_epsilon,
     )
 
-    noise_scheduler = DDPMScheduler.from_config("CompVis/stable-diffusion-v1-4", subfolder="scheduler")
+    noise_scheduler = DDPMScheduler.from_config(args.pretrained_model_name_or_path, subfolder="scheduler")
 
     train_dataset = TextualInversionDataset(
         data_root=args.train_data_dir,
@@ -530,9 +550,17 @@ def main():
                 encoder_hidden_states = text_encoder(batch["input_ids"])[0]
 
                 # Predict the noise residual
-                noise_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
+                model_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
 
-                loss = F.mse_loss(noise_pred, noise, reduction="none").mean([1, 2, 3]).mean()
+                # Get the target for loss depending on the prediction type
+                if noise_scheduler.config.prediction_type == "epsilon":
+                    target = noise
+                elif noise_scheduler.config.prediction_type == "v_prediction":
+                    target = noise_scheduler.get_velocity(latents, noise, timesteps)
+                else:
+                    raise ValueError(f"Unknown prediction type {noise_scheduler.config.prediction_type}")
+
+                loss = F.mse_loss(model_pred, target, reduction="none").mean([1, 2, 3]).mean()
                 accelerator.backward(loss)
 
                 # Zero out the gradients for all token embeddings except the newly added
@@ -554,7 +582,8 @@ def main():
                 progress_bar.update(1)
                 global_step += 1
                 if global_step % args.save_steps == 0:
-                    save_progress(text_encoder, placeholder_token_id, accelerator, args)
+                    save_path = os.path.join(args.output_dir, f"learned_embeds-steps-{global_step}.bin")
+                    save_progress(text_encoder, placeholder_token_id, accelerator, args, save_path)
 
             logs = {"loss": loss.detach().item(), "lr": lr_scheduler.get_last_lr()[0]}
             progress_bar.set_postfix(**logs)
@@ -567,18 +596,18 @@ def main():
 
     # Create the pipeline using using the trained modules and save it.
     if accelerator.is_main_process:
-        pipeline = StableDiffusionPipeline(
+        pipeline = StableDiffusionPipeline.from_pretrained(
+            args.pretrained_model_name_or_path,
             text_encoder=accelerator.unwrap_model(text_encoder),
+            tokenizer=tokenizer,
             vae=vae,
             unet=unet,
-            tokenizer=tokenizer,
-            scheduler=PNDMScheduler.from_config("CompVis/stable-diffusion-v1-4", subfolder="scheduler"),
-            safety_checker=StableDiffusionSafetyChecker.from_pretrained("CompVis/stable-diffusion-safety-checker"),
-            feature_extractor=CLIPFeatureExtractor.from_pretrained("openai/clip-vit-base-patch32"),
+            revision=args.revision,
         )
         pipeline.save_pretrained(args.output_dir)
         # Also save the newly trained embeddings
-        save_progress(text_encoder, placeholder_token_id, accelerator, args)
+        save_path = os.path.join(args.output_dir, "learned_embeds.bin")
+        save_progress(text_encoder, placeholder_token_id, accelerator, args, save_path)
 
         if args.push_to_hub:
             repo.push_to_hub(commit_message="End of training", blocking=False, auto_lfs_prune=True)

examples/textual_inversion/textual_inversion_flax.py

@@ -14,6 +14,7 @@ from torch.utils.data import Dataset
 import jax
 import jax.numpy as jnp
 import optax
+import PIL
 import transformers
 from diffusers import (
     FlaxAutoencoderKL,
@@ -27,15 +28,15 @@ from flax import jax_utils
 from flax.training import train_state
 from flax.training.common_utils import shard
 from huggingface_hub import HfFolder, Repository, whoami
+
+# TODO: remove and import from diffusers.utils when the new version of diffusers is released
+from packaging import version
 from PIL import Image
 from torchvision import transforms
 from tqdm.auto import tqdm
 from transformers import CLIPFeatureExtractor, CLIPTokenizer, FlaxCLIPTextModel, set_seed
 
 
-# TODO: remove and import from diffusers.utils when the new version of diffusers is released
-from packaging import version
-import PIL
 if version.parse(version.parse(PIL.__version__).base_version) >= version.parse("9.1.0"):
     PIL_INTERPOLATION = {
         "linear": PIL.Image.Resampling.BILINEAR,

examples/unconditional_image_generation/README.md

@@ -127,3 +127,24 @@ dataset.push_to_hub("name_of_your_dataset", private=True)
 and that's it! You can now train your model by simply setting the `--dataset_name` argument to the name of your dataset on the hub.
 
 More on this can also be found in [this blog post](https://huggingface.co/blog/image-search-datasets).
+
+#### Use ONNXRuntime to accelerate training
+
+In order to leverage onnxruntime to accelerate training, please use train_unconditional_ort.py
+
+The command to train a DDPM UNet model on the Oxford Flowers dataset with onnxruntime:
+
+```bash
+accelerate launch train_unconditional_ort.py \
+  --dataset_name="huggan/flowers-102-categories" \
+  --resolution=64 \
+  --output_dir="ddpm-ema-flowers-64" \
+  --train_batch_size=16 \
+  --num_epochs=1 \
+  --gradient_accumulation_steps=1 \
+  --learning_rate=1e-4 \
+  --lr_warmup_steps=500 \
+  --mixed_precision=fp16
+  ```
+
+Please contact Prathik Rao (prathikr), Sunghoon Choi (hanbitmyths), Ashwini Khade (askhade), or Peng Wang (pengwa) on github with any questions.

examples/unconditional_image_generation/train_unconditional.py

@@ -194,9 +194,10 @@ def parse_args():
     )
 
     parser.add_argument(
-        "--predict_epsilon",
-        action="store_true",
-        default=True,
+        "--prediction_type",
+        type=str,
+        default="epsilon",
+        choices=["epsilon", "sample"],
         help="Whether the model should predict the 'epsilon'/noise error or directly the reconstructed image 'x0'.",
     )
 
@@ -256,13 +257,13 @@ def main(args):
             "UpBlock2D",
         ),
     )
-    accepts_predict_epsilon = "predict_epsilon" in set(inspect.signature(DDPMScheduler.__init__).parameters.keys())
+    accepts_prediction_type = "prediction_type" in set(inspect.signature(DDPMScheduler.__init__).parameters.keys())
 
-    if accepts_predict_epsilon:
+    if accepts_prediction_type:
         noise_scheduler = DDPMScheduler(
             num_train_timesteps=args.ddpm_num_steps,
             beta_schedule=args.ddpm_beta_schedule,
-            predict_epsilon=args.predict_epsilon,
+            prediction_type=args.prediction_type,
         )
     else:
         noise_scheduler = DDPMScheduler(num_train_timesteps=args.ddpm_num_steps, beta_schedule=args.ddpm_beta_schedule)
@@ -319,7 +320,12 @@ def main(args):
 
     num_update_steps_per_epoch = math.ceil(len(train_dataloader) / args.gradient_accumulation_steps)
 
-    ema_model = EMAModel(model, inv_gamma=args.ema_inv_gamma, power=args.ema_power, max_value=args.ema_max_decay)
+    ema_model = EMAModel(
+        accelerator.unwrap_model(model),
+        inv_gamma=args.ema_inv_gamma,
+        power=args.ema_power,
+        max_value=args.ema_max_decay,
+    )
 
     # Handle the repository creation
     if accelerator.is_main_process:
@@ -365,9 +371,9 @@ def main(args):
                 # Predict the noise residual
                 model_output = model(noisy_images, timesteps).sample
 
-                if args.predict_epsilon:
+                if args.prediction_type == "epsilon":
                     loss = F.mse_loss(model_output, noise)  # this could have different weights!
-                else:
+                elif args.prediction_type == "sample":
                     alpha_t = _extract_into_tensor(
                         noise_scheduler.alphas_cumprod, timesteps, (clean_images.shape[0], 1, 1, 1)
                     )
@@ -376,6 +382,8 @@ def main(args):
                         model_output, clean_images, reduction="none"
                     )  # use SNR weighting from distillation paper
                     loss = loss.mean()
+                else:
+                    raise ValueError(f"Unsupported prediction type: {args.prediction_type}")
 
                 accelerator.backward(loss)
 

examples/unconditional_image_generation/train_unconditional_ort.py

@@ -0,0 +1,251 @@
+import argparse
+import math
+import os
+
+import torch
+import torch.nn.functional as F
+
+from accelerate import Accelerator
+from accelerate.logging import get_logger
+from datasets import load_dataset
+from diffusers import DDPMPipeline, DDPMScheduler, UNet2DModel
+from diffusers.hub_utils import init_git_repo, push_to_hub
+from diffusers.optimization import get_scheduler
+from diffusers.training_utils import EMAModel
+from onnxruntime.training.ortmodule import ORTModule
+from torchvision.transforms import (
+    CenterCrop,
+    Compose,
+    InterpolationMode,
+    Normalize,
+    RandomHorizontalFlip,
+    Resize,
+    ToTensor,
+)
+from tqdm.auto import tqdm
+
+
+logger = get_logger(__name__)
+
+
+def main(args):
+    logging_dir = os.path.join(args.output_dir, args.logging_dir)
+    accelerator = Accelerator(
+        gradient_accumulation_steps=args.gradient_accumulation_steps,
+        mixed_precision=args.mixed_precision,
+        log_with="tensorboard",
+        logging_dir=logging_dir,
+    )
+
+    model = UNet2DModel(
+        sample_size=args.resolution,
+        in_channels=3,
+        out_channels=3,
+        layers_per_block=2,
+        block_out_channels=(128, 128, 256, 256, 512, 512),
+        down_block_types=(
+            "DownBlock2D",
+            "DownBlock2D",
+            "DownBlock2D",
+            "DownBlock2D",
+            "AttnDownBlock2D",
+            "DownBlock2D",
+        ),
+        up_block_types=(
+            "UpBlock2D",
+            "AttnUpBlock2D",
+            "UpBlock2D",
+            "UpBlock2D",
+            "UpBlock2D",
+            "UpBlock2D",
+        ),
+    )
+    model = ORTModule(model)
+    noise_scheduler = DDPMScheduler(num_train_timesteps=1000, tensor_format="pt")
+    optimizer = torch.optim.AdamW(
+        model.parameters(),
+        lr=args.learning_rate,
+        betas=(args.adam_beta1, args.adam_beta2),
+        weight_decay=args.adam_weight_decay,
+        eps=args.adam_epsilon,
+    )
+
+    augmentations = Compose(
+        [
+            Resize(args.resolution, interpolation=InterpolationMode.BILINEAR),
+            CenterCrop(args.resolution),
+            RandomHorizontalFlip(),
+            ToTensor(),
+            Normalize([0.5], [0.5]),
+        ]
+    )
+
+    if args.dataset_name is not None:
+        dataset = load_dataset(
+            args.dataset_name,
+            args.dataset_config_name,
+            cache_dir=args.cache_dir,
+            use_auth_token=True if args.use_auth_token else None,
+            split="train",
+        )
+    else:
+        dataset = load_dataset("imagefolder", data_dir=args.train_data_dir, cache_dir=args.cache_dir, split="train")
+
+    def transforms(examples):
+        images = [augmentations(image.convert("RGB")) for image in examples["image"]]
+        return {"input": images}
+
+    dataset.set_transform(transforms)
+    train_dataloader = torch.utils.data.DataLoader(dataset, batch_size=args.train_batch_size, shuffle=True)
+
+    lr_scheduler = get_scheduler(
+        args.lr_scheduler,
+        optimizer=optimizer,
+        num_warmup_steps=args.lr_warmup_steps,
+        num_training_steps=(len(train_dataloader) * args.num_epochs) // args.gradient_accumulation_steps,
+    )
+
+    model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+        model, optimizer, train_dataloader, lr_scheduler
+    )
+
+    num_update_steps_per_epoch = math.ceil(len(train_dataloader) / args.gradient_accumulation_steps)
+
+    ema_model = EMAModel(model, inv_gamma=args.ema_inv_gamma, power=args.ema_power, max_value=args.ema_max_decay)
+
+    if args.push_to_hub:
+        repo = init_git_repo(args, at_init=True)
+
+    if accelerator.is_main_process:
+        run = os.path.split(__file__)[-1].split(".")[0]
+        accelerator.init_trackers(run)
+
+    global_step = 0
+    for epoch in range(args.num_epochs):
+        model.train()
+        progress_bar = tqdm(total=num_update_steps_per_epoch, disable=not accelerator.is_local_main_process)
+        progress_bar.set_description(f"Epoch {epoch}")
+        for step, batch in enumerate(train_dataloader):
+            clean_images = batch["input"]
+            # Sample noise that we'll add to the images
+            noise = torch.randn(clean_images.shape).to(clean_images.device)
+            bsz = clean_images.shape[0]
+            # Sample a random timestep for each image
+            timesteps = torch.randint(
+                0, noise_scheduler.config.num_train_timesteps, (bsz,), device=clean_images.device
+            ).long()
+
+            # Add noise to the clean images according to the noise magnitude at each timestep
+            # (this is the forward diffusion process)
+            noisy_images = noise_scheduler.add_noise(clean_images, noise, timesteps)
+
+            with accelerator.accumulate(model):
+                # Predict the noise residual
+                noise_pred = model(noisy_images, timesteps, return_dict=True)[0]
+                loss = F.mse_loss(noise_pred, noise)
+                accelerator.backward(loss)
+
+                accelerator.clip_grad_norm_(model.parameters(), 1.0)
+                optimizer.step()
+                lr_scheduler.step()
+                if args.use_ema:
+                    ema_model.step(model)
+                optimizer.zero_grad()
+
+            # Checks if the accelerator has performed an optimization step behind the scenes
+            if accelerator.sync_gradients:
+                progress_bar.update(1)
+                global_step += 1
+
+            logs = {"loss": loss.detach().item(), "lr": lr_scheduler.get_last_lr()[0], "step": global_step}
+            if args.use_ema:
+                logs["ema_decay"] = ema_model.decay
+            progress_bar.set_postfix(**logs)
+            accelerator.log(logs, step=global_step)
+        progress_bar.close()
+
+        accelerator.wait_for_everyone()
+
+        # Generate sample images for visual inspection
+        if accelerator.is_main_process:
+            if epoch % args.save_images_epochs == 0 or epoch == args.num_epochs - 1:
+                pipeline = DDPMPipeline(
+                    unet=accelerator.unwrap_model(ema_model.averaged_model if args.use_ema else model),
+                    scheduler=noise_scheduler,
+                )
+
+                generator = torch.manual_seed(0)
+                # run pipeline in inference (sample random noise and denoise)
+                images = pipeline(generator=generator, batch_size=args.eval_batch_size, output_type="numpy").images
+
+                # denormalize the images and save to tensorboard
+                images_processed = (images * 255).round().astype("uint8")
+                accelerator.trackers[0].writer.add_images(
+                    "test_samples", images_processed.transpose(0, 3, 1, 2), epoch
+                )
+
+            if epoch % args.save_model_epochs == 0 or epoch == args.num_epochs - 1:
+                # save the model
+                if args.push_to_hub:
+                    push_to_hub(args, pipeline, repo, commit_message=f"Epoch {epoch}", blocking=False)
+                else:
+                    pipeline.save_pretrained(args.output_dir)
+        accelerator.wait_for_everyone()
+
+    accelerator.end_training()
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Simple example of a training script.")
+    parser.add_argument("--local_rank", type=int, default=-1)
+    parser.add_argument("--dataset_name", type=str, default=None)
+    parser.add_argument("--dataset_config_name", type=str, default=None)
+    parser.add_argument("--train_data_dir", type=str, default=None, help="A folder containing the training data.")
+    parser.add_argument("--output_dir", type=str, default="ddpm-model-64")
+    parser.add_argument("--overwrite_output_dir", action="store_true")
+    parser.add_argument("--cache_dir", type=str, default=None)
+    parser.add_argument("--resolution", type=int, default=64)
+    parser.add_argument("--train_batch_size", type=int, default=16)
+    parser.add_argument("--eval_batch_size", type=int, default=16)
+    parser.add_argument("--num_epochs", type=int, default=100)
+    parser.add_argument("--save_images_epochs", type=int, default=10)
+    parser.add_argument("--save_model_epochs", type=int, default=10)
+    parser.add_argument("--gradient_accumulation_steps", type=int, default=1)
+    parser.add_argument("--learning_rate", type=float, default=1e-4)
+    parser.add_argument("--lr_scheduler", type=str, default="cosine")
+    parser.add_argument("--lr_warmup_steps", type=int, default=500)
+    parser.add_argument("--adam_beta1", type=float, default=0.95)
+    parser.add_argument("--adam_beta2", type=float, default=0.999)
+    parser.add_argument("--adam_weight_decay", type=float, default=1e-6)
+    parser.add_argument("--adam_epsilon", type=float, default=1e-08)
+    parser.add_argument("--use_ema", action="store_true", default=True)
+    parser.add_argument("--ema_inv_gamma", type=float, default=1.0)
+    parser.add_argument("--ema_power", type=float, default=3 / 4)
+    parser.add_argument("--ema_max_decay", type=float, default=0.9999)
+    parser.add_argument("--push_to_hub", action="store_true")
+    parser.add_argument("--use_auth_token", action="store_true")
+    parser.add_argument("--hub_token", type=str, default=None)
+    parser.add_argument("--hub_model_id", type=str, default=None)
+    parser.add_argument("--hub_private_repo", action="store_true")
+    parser.add_argument("--logging_dir", type=str, default="logs")
+    parser.add_argument(
+        "--mixed_precision",
+        type=str,
+        default="no",
+        choices=["no", "fp16", "bf16"],
+        help=(
+            "Whether to use mixed precision. Choose"
+            "between fp16 and bf16 (bfloat16). Bf16 requires PyTorch >= 1.10."
+            "and an Nvidia Ampere GPU."
+        ),
+    )
+
+    args = parser.parse_args()
+    env_local_rank = int(os.environ.get("LOCAL_RANK", -1))
+    if env_local_rank != -1 and env_local_rank != args.local_rank:
+        args.local_rank = env_local_rank
+
+    if args.dataset_name is None and args.train_data_dir is None:
+        raise ValueError("You must specify either a dataset name from the hub or a train data directory.")
+
+    main(args)

scripts/convert_original_stable_diffusion_to_diffusers.py

@@ -211,6 +211,7 @@ def create_unet_diffusers_config(original_config):
     """
     Creates a config for the diffusers based on the config of the LDM model.
     """
+    model_params = original_config.model.params
     unet_params = original_config.model.params.unet_config.params
 
     block_out_channels = [unet_params.model_channels * mult for mult in unet_params.channel_mult]
@@ -230,7 +231,7 @@ def create_unet_diffusers_config(original_config):
         resolution //= 2
 
     config = dict(
-        sample_size=unet_params.image_size,
+        sample_size=model_params.image_size,
         in_channels=unet_params.in_channels,
         out_channels=unet_params.out_channels,
         down_block_types=tuple(down_block_types),
@@ -665,17 +666,29 @@ if __name__ == "__main__":
 
     args = parser.parse_args()
 
-    if args.original_config_file is None:
-        os.system(
-            "wget https://raw.githubusercontent.com/CompVis/stable-diffusion/main/configs/stable-diffusion/v1-inference.yaml"
-        )
-        args.original_config_file = "./v1-inference.yaml"
-
-    original_config = OmegaConf.load(args.original_config_file)
-
     checkpoint = torch.load(args.checkpoint_path)
     checkpoint = checkpoint["state_dict"]
 
+    prediction_type = "epsilon"
+    if args.original_config_file is None:
+        key_name = "model.diffusion_model.input_blocks.2.1.transformer_blocks.0.attn2.to_k.weight"
+
+        if key_name in checkpoint and checkpoint[key_name].shape[-1] == 1024:
+            # model_type = "v2"
+            os.system(
+                "wget https://raw.githubusercontent.com/Stability-AI/stablediffusion/main/configs/stable-diffusion/v2-inference-v.yaml"
+            )
+            args.original_config_file = "./v2-inference-v.yaml"
+            prediction_type
+        else:
+            # model_type = "v2"
+            os.system(
+                "wget https://raw.githubusercontent.com/CompVis/stable-diffusion/main/configs/stable-diffusion/v1-inference.yaml"
+            )
+            args.original_config_file = "./v1-inference.yaml"
+
+    original_config = OmegaConf.load(args.original_config_file)
+
     num_train_timesteps = original_config.model.params.timesteps
     beta_start = original_config.model.params.linear_start
     beta_end = original_config.model.params.linear_end

scripts/convert_stable_diffusion_checkpoint_to_onnx.py

@@ -215,8 +215,10 @@ def convert_models(model_path: str, output_path: str, opset: int, fp16: bool = F
         )
         del pipeline.safety_checker
         safety_checker = OnnxRuntimeModel.from_pretrained(output_path / "safety_checker")
+        feature_extractor = pipeline.feature_extractor
     else:
         safety_checker = None
+        feature_extractor = None
 
     onnx_pipeline = OnnxStableDiffusionPipeline(
         vae_encoder=OnnxRuntimeModel.from_pretrained(output_path / "vae_encoder"),
@@ -226,7 +228,8 @@ def convert_models(model_path: str, output_path: str, opset: int, fp16: bool = F
         unet=OnnxRuntimeModel.from_pretrained(output_path / "unet"),
         scheduler=pipeline.scheduler,
         safety_checker=safety_checker,
-        feature_extractor=pipeline.feature_extractor,
+        feature_extractor=feature_extractor,
+        requires_safety_checker=safety_checker is not None,
     )
 
     onnx_pipeline.save_pretrained(output_path)

scripts/convert_versatile_diffusion_to_diffusers.py

@@ -0,0 +1,791 @@
+# coding=utf-8
+# Copyright 2022 The HuggingFace Inc. team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+""" Conversion script for the Versatile Stable Diffusion checkpoints. """
+
+import argparse
+from argparse import Namespace
+
+import torch
+
+from diffusers import (
+    AutoencoderKL,
+    DDIMScheduler,
+    DPMSolverMultistepScheduler,
+    EulerAncestralDiscreteScheduler,
+    EulerDiscreteScheduler,
+    LMSDiscreteScheduler,
+    PNDMScheduler,
+    UNet2DConditionModel,
+    VersatileDiffusionPipeline,
+)
+from diffusers.pipelines.versatile_diffusion.modeling_text_unet import UNetFlatConditionModel
+from transformers import (
+    CLIPFeatureExtractor,
+    CLIPTextModelWithProjection,
+    CLIPTokenizer,
+    CLIPVisionModelWithProjection,
+)
+
+
+SCHEDULER_CONFIG = Namespace(
+    **{
+        "beta_linear_start": 0.00085,
+        "beta_linear_end": 0.012,
+        "timesteps": 1000,
+        "scale_factor": 0.18215,
+    }
+)
+
+IMAGE_UNET_CONFIG = Namespace(
+    **{
+        "input_channels": 4,
+        "model_channels": 320,
+        "output_channels": 4,
+        "num_noattn_blocks": [2, 2, 2, 2],
+        "channel_mult": [1, 2, 4, 4],
+        "with_attn": [True, True, True, False],
+        "num_heads": 8,
+        "context_dim": 768,
+        "use_checkpoint": True,
+    }
+)
+
+TEXT_UNET_CONFIG = Namespace(
+    **{
+        "input_channels": 768,
+        "model_channels": 320,
+        "output_channels": 768,
+        "num_noattn_blocks": [2, 2, 2, 2],
+        "channel_mult": [1, 2, 4, 4],
+        "second_dim": [4, 4, 4, 4],
+        "with_attn": [True, True, True, False],
+        "num_heads": 8,
+        "context_dim": 768,
+        "use_checkpoint": True,
+    }
+)
+
+AUTOENCODER_CONFIG = Namespace(
+    **{
+        "double_z": True,
+        "z_channels": 4,
+        "resolution": 256,
+        "in_channels": 3,
+        "out_ch": 3,
+        "ch": 128,
+        "ch_mult": [1, 2, 4, 4],
+        "num_res_blocks": 2,
+        "attn_resolutions": [],
+        "dropout": 0.0,
+    }
+)
+
+
+def shave_segments(path, n_shave_prefix_segments=1):
+    """
+    Removes segments. Positive values shave the first segments, negative shave the last segments.
+    """
+    if n_shave_prefix_segments >= 0:
+        return ".".join(path.split(".")[n_shave_prefix_segments:])
+    else:
+        return ".".join(path.split(".")[:n_shave_prefix_segments])
+
+
+def renew_resnet_paths(old_list, n_shave_prefix_segments=0):
+    """
+    Updates paths inside resnets to the new naming scheme (local renaming)
+    """
+    mapping = []
+    for old_item in old_list:
+        new_item = old_item.replace("in_layers.0", "norm1")
+        new_item = new_item.replace("in_layers.2", "conv1")
+
+        new_item = new_item.replace("out_layers.0", "norm2")
+        new_item = new_item.replace("out_layers.3", "conv2")
+
+        new_item = new_item.replace("emb_layers.1", "time_emb_proj")
+        new_item = new_item.replace("skip_connection", "conv_shortcut")
+
+        new_item = shave_segments(new_item, n_shave_prefix_segments=n_shave_prefix_segments)
+
+        mapping.append({"old": old_item, "new": new_item})
+
+    return mapping
+
+
+def renew_vae_resnet_paths(old_list, n_shave_prefix_segments=0):
+    """
+    Updates paths inside resnets to the new naming scheme (local renaming)
+    """
+    mapping = []
+    for old_item in old_list:
+        new_item = old_item
+
+        new_item = new_item.replace("nin_shortcut", "conv_shortcut")
+        new_item = shave_segments(new_item, n_shave_prefix_segments=n_shave_prefix_segments)
+
+        mapping.append({"old": old_item, "new": new_item})
+
+    return mapping
+
+
+def renew_attention_paths(old_list, n_shave_prefix_segments=0):
+    """
+    Updates paths inside attentions to the new naming scheme (local renaming)
+    """
+    mapping = []
+    for old_item in old_list:
+        new_item = old_item
+
+        #         new_item = new_item.replace('norm.weight', 'group_norm.weight')
+        #         new_item = new_item.replace('norm.bias', 'group_norm.bias')
+
+        #         new_item = new_item.replace('proj_out.weight', 'proj_attn.weight')
+        #         new_item = new_item.replace('proj_out.bias', 'proj_attn.bias')
+
+        #         new_item = shave_segments(new_item, n_shave_prefix_segments=n_shave_prefix_segments)
+
+        mapping.append({"old": old_item, "new": new_item})
+
+    return mapping
+
+
+def renew_vae_attention_paths(old_list, n_shave_prefix_segments=0):
+    """
+    Updates paths inside attentions to the new naming scheme (local renaming)
+    """
+    mapping = []
+    for old_item in old_list:
+        new_item = old_item
+
+        new_item = new_item.replace("norm.weight", "group_norm.weight")
+        new_item = new_item.replace("norm.bias", "group_norm.bias")
+
+        new_item = new_item.replace("q.weight", "query.weight")
+        new_item = new_item.replace("q.bias", "query.bias")
+
+        new_item = new_item.replace("k.weight", "key.weight")
+        new_item = new_item.replace("k.bias", "key.bias")
+
+        new_item = new_item.replace("v.weight", "value.weight")
+        new_item = new_item.replace("v.bias", "value.bias")
+
+        new_item = new_item.replace("proj_out.weight", "proj_attn.weight")
+        new_item = new_item.replace("proj_out.bias", "proj_attn.bias")
+
+        new_item = shave_segments(new_item, n_shave_prefix_segments=n_shave_prefix_segments)
+
+        mapping.append({"old": old_item, "new": new_item})
+
+    return mapping
+
+
+def assign_to_checkpoint(
+    paths, checkpoint, old_checkpoint, attention_paths_to_split=None, additional_replacements=None, config=None
+):
+    """
+    This does the final conversion step: take locally converted weights and apply a global renaming
+    to them. It splits attention layers, and takes into account additional replacements
+    that may arise.
+
+    Assigns the weights to the new checkpoint.
+    """
+    assert isinstance(paths, list), "Paths should be a list of dicts containing 'old' and 'new' keys."
+
+    # Splits the attention layers into three variables.
+    if attention_paths_to_split is not None:
+        for path, path_map in attention_paths_to_split.items():
+            old_tensor = old_checkpoint[path]
+            channels = old_tensor.shape[0] // 3
+
+            target_shape = (-1, channels) if len(old_tensor.shape) == 3 else (-1)
+
+            num_heads = old_tensor.shape[0] // config["num_head_channels"] // 3
+
+            old_tensor = old_tensor.reshape((num_heads, 3 * channels // num_heads) + old_tensor.shape[1:])
+            query, key, value = old_tensor.split(channels // num_heads, dim=1)
+
+            checkpoint[path_map["query"]] = query.reshape(target_shape)
+            checkpoint[path_map["key"]] = key.reshape(target_shape)
+            checkpoint[path_map["value"]] = value.reshape(target_shape)
+
+    for path in paths:
+        new_path = path["new"]
+
+        # These have already been assigned
+        if attention_paths_to_split is not None and new_path in attention_paths_to_split:
+            continue
+
+        # Global renaming happens here
+        new_path = new_path.replace("middle_block.0", "mid_block.resnets.0")
+        new_path = new_path.replace("middle_block.1", "mid_block.attentions.0")
+        new_path = new_path.replace("middle_block.2", "mid_block.resnets.1")
+
+        if additional_replacements is not None:
+            for replacement in additional_replacements:
+                new_path = new_path.replace(replacement["old"], replacement["new"])
+
+        # proj_attn.weight has to be converted from conv 1D to linear
+        if "proj_attn.weight" in new_path:
+            checkpoint[new_path] = old_checkpoint[path["old"]][:, :, 0]
+        elif path["old"] in old_checkpoint:
+            checkpoint[new_path] = old_checkpoint[path["old"]]
+
+
+def conv_attn_to_linear(checkpoint):
+    keys = list(checkpoint.keys())
+    attn_keys = ["query.weight", "key.weight", "value.weight"]
+    for key in keys:
+        if ".".join(key.split(".")[-2:]) in attn_keys:
+            if checkpoint[key].ndim > 2:
+                checkpoint[key] = checkpoint[key][:, :, 0, 0]
+        elif "proj_attn.weight" in key:
+            if checkpoint[key].ndim > 2:
+                checkpoint[key] = checkpoint[key][:, :, 0]
+
+
+def create_image_unet_diffusers_config(unet_params):
+    """
+    Creates a config for the diffusers based on the config of the VD model.
+    """
+
+    block_out_channels = [unet_params.model_channels * mult for mult in unet_params.channel_mult]
+
+    down_block_types = []
+    resolution = 1
+    for i in range(len(block_out_channels)):
+        block_type = "CrossAttnDownBlock2D" if unet_params.with_attn[i] else "DownBlock2D"
+        down_block_types.append(block_type)
+        if i != len(block_out_channels) - 1:
+            resolution *= 2
+
+    up_block_types = []
+    for i in range(len(block_out_channels)):
+        block_type = "CrossAttnUpBlock2D" if unet_params.with_attn[-i - 1] else "UpBlock2D"
+        up_block_types.append(block_type)
+        resolution //= 2
+
+    if not all(n == unet_params.num_noattn_blocks[0] for n in unet_params.num_noattn_blocks):
+        raise ValueError("Not all num_res_blocks are equal, which is not supported in this script.")
+
+    config = dict(
+        sample_size=None,
+        in_channels=unet_params.input_channels,
+        out_channels=unet_params.output_channels,
+        down_block_types=tuple(down_block_types),
+        up_block_types=tuple(up_block_types),
+        block_out_channels=tuple(block_out_channels),
+        layers_per_block=unet_params.num_noattn_blocks[0],
+        cross_attention_dim=unet_params.context_dim,
+        attention_head_dim=unet_params.num_heads,
+    )
+
+    return config
+
+
+def create_text_unet_diffusers_config(unet_params):
+    """
+    Creates a config for the diffusers based on the config of the VD model.
+    """
+
+    block_out_channels = [unet_params.model_channels * mult for mult in unet_params.channel_mult]
+
+    down_block_types = []
+    resolution = 1
+    for i in range(len(block_out_channels)):
+        block_type = "CrossAttnDownBlockFlat" if unet_params.with_attn[i] else "DownBlockFlat"
+        down_block_types.append(block_type)
+        if i != len(block_out_channels) - 1:
+            resolution *= 2
+
+    up_block_types = []
+    for i in range(len(block_out_channels)):
+        block_type = "CrossAttnUpBlockFlat" if unet_params.with_attn[-i - 1] else "UpBlockFlat"
+        up_block_types.append(block_type)
+        resolution //= 2
+
+    if not all(n == unet_params.num_noattn_blocks[0] for n in unet_params.num_noattn_blocks):
+        raise ValueError("Not all num_res_blocks are equal, which is not supported in this script.")
+
+    config = dict(
+        sample_size=None,
+        in_channels=(unet_params.input_channels, 1, 1),
+        out_channels=(unet_params.output_channels, 1, 1),
+        down_block_types=tuple(down_block_types),
+        up_block_types=tuple(up_block_types),
+        block_out_channels=tuple(block_out_channels),
+        layers_per_block=unet_params.num_noattn_blocks[0],
+        cross_attention_dim=unet_params.context_dim,
+        attention_head_dim=unet_params.num_heads,
+    )
+
+    return config
+
+
+def create_vae_diffusers_config(vae_params):
+    """
+    Creates a config for the diffusers based on the config of the VD model.
+    """
+
+    block_out_channels = [vae_params.ch * mult for mult in vae_params.ch_mult]
+    down_block_types = ["DownEncoderBlock2D"] * len(block_out_channels)
+    up_block_types = ["UpDecoderBlock2D"] * len(block_out_channels)
+
+    config = dict(
+        sample_size=vae_params.resolution,
+        in_channels=vae_params.in_channels,
+        out_channels=vae_params.out_ch,
+        down_block_types=tuple(down_block_types),
+        up_block_types=tuple(up_block_types),
+        block_out_channels=tuple(block_out_channels),
+        latent_channels=vae_params.z_channels,
+        layers_per_block=vae_params.num_res_blocks,
+    )
+    return config
+
+
+def create_diffusers_scheduler(original_config):
+    schedular = DDIMScheduler(
+        num_train_timesteps=original_config.model.params.timesteps,
+        beta_start=original_config.model.params.linear_start,
+        beta_end=original_config.model.params.linear_end,
+        beta_schedule="scaled_linear",
+    )
+    return schedular
+
+
+def convert_vd_unet_checkpoint(checkpoint, config, unet_key, extract_ema=False):
+    """
+    Takes a state dict and a config, and returns a converted checkpoint.
+    """
+
+    # extract state_dict for UNet
+    unet_state_dict = {}
+    keys = list(checkpoint.keys())
+
+    # at least a 100 parameters have to start with `model_ema` in order for the checkpoint to be EMA
+    if sum(k.startswith("model_ema") for k in keys) > 100:
+        print("Checkpoint has both EMA and non-EMA weights.")
+        if extract_ema:
+            print(
+                "In this conversion only the EMA weights are extracted. If you want to instead extract the non-EMA"
+                " weights (useful to continue fine-tuning), please make sure to remove the `--extract_ema` flag."
+            )
+            for key in keys:
+                if key.startswith("model.diffusion_model"):
+                    flat_ema_key = "model_ema." + "".join(key.split(".")[1:])
+                    unet_state_dict[key.replace(unet_key, "")] = checkpoint.pop(flat_ema_key)
+        else:
+            print(
+                "In this conversion only the non-EMA weights are extracted. If you want to instead extract the EMA"
+                " weights (usually better for inference), please make sure to add the `--extract_ema` flag."
+            )
+
+    for key in keys:
+        if key.startswith(unet_key):
+            unet_state_dict[key.replace(unet_key, "")] = checkpoint.pop(key)
+
+    new_checkpoint = {}
+
+    new_checkpoint["time_embedding.linear_1.weight"] = checkpoint["model.diffusion_model.time_embed.0.weight"]
+    new_checkpoint["time_embedding.linear_1.bias"] = checkpoint["model.diffusion_model.time_embed.0.bias"]
+    new_checkpoint["time_embedding.linear_2.weight"] = checkpoint["model.diffusion_model.time_embed.2.weight"]
+    new_checkpoint["time_embedding.linear_2.bias"] = checkpoint["model.diffusion_model.time_embed.2.bias"]
+
+    new_checkpoint["conv_in.weight"] = unet_state_dict["input_blocks.0.0.weight"]
+    new_checkpoint["conv_in.bias"] = unet_state_dict["input_blocks.0.0.bias"]
+
+    new_checkpoint["conv_norm_out.weight"] = unet_state_dict["out.0.weight"]
+    new_checkpoint["conv_norm_out.bias"] = unet_state_dict["out.0.bias"]
+    new_checkpoint["conv_out.weight"] = unet_state_dict["out.2.weight"]
+    new_checkpoint["conv_out.bias"] = unet_state_dict["out.2.bias"]
+
+    # Retrieves the keys for the input blocks only
+    num_input_blocks = len({".".join(layer.split(".")[:2]) for layer in unet_state_dict if "input_blocks" in layer})
+    input_blocks = {
+        layer_id: [key for key in unet_state_dict if f"input_blocks.{layer_id}" in key]
+        for layer_id in range(num_input_blocks)
+    }
+
+    # Retrieves the keys for the middle blocks only
+    num_middle_blocks = len({".".join(layer.split(".")[:2]) for layer in unet_state_dict if "middle_block" in layer})
+    middle_blocks = {
+        layer_id: [key for key in unet_state_dict if f"middle_block.{layer_id}" in key]
+        for layer_id in range(num_middle_blocks)
+    }
+
+    # Retrieves the keys for the output blocks only
+    num_output_blocks = len({".".join(layer.split(".")[:2]) for layer in unet_state_dict if "output_blocks" in layer})
+    output_blocks = {
+        layer_id: [key for key in unet_state_dict if f"output_blocks.{layer_id}" in key]
+        for layer_id in range(num_output_blocks)
+    }
+
+    for i in range(1, num_input_blocks):
+        block_id = (i - 1) // (config["layers_per_block"] + 1)
+        layer_in_block_id = (i - 1) % (config["layers_per_block"] + 1)
+
+        resnets = [
+            key for key in input_blocks[i] if f"input_blocks.{i}.0" in key and f"input_blocks.{i}.0.op" not in key
+        ]
+        attentions = [key for key in input_blocks[i] if f"input_blocks.{i}.1" in key]
+
+        if f"input_blocks.{i}.0.op.weight" in unet_state_dict:
+            new_checkpoint[f"down_blocks.{block_id}.downsamplers.0.conv.weight"] = unet_state_dict.pop(
+                f"input_blocks.{i}.0.op.weight"
+            )
+            new_checkpoint[f"down_blocks.{block_id}.downsamplers.0.conv.bias"] = unet_state_dict.pop(
+                f"input_blocks.{i}.0.op.bias"
+            )
+        elif f"input_blocks.{i}.0.weight" in unet_state_dict:
+            # text_unet uses linear layers in place of downsamplers
+            shape = unet_state_dict[f"input_blocks.{i}.0.weight"].shape
+            if shape[0] != shape[1]:
+                continue
+            new_checkpoint[f"down_blocks.{block_id}.downsamplers.0.weight"] = unet_state_dict.pop(
+                f"input_blocks.{i}.0.weight"
+            )
+            new_checkpoint[f"down_blocks.{block_id}.downsamplers.0.bias"] = unet_state_dict.pop(
+                f"input_blocks.{i}.0.bias"
+            )
+
+        paths = renew_resnet_paths(resnets)
+        meta_path = {"old": f"input_blocks.{i}.0", "new": f"down_blocks.{block_id}.resnets.{layer_in_block_id}"}
+        assign_to_checkpoint(
+            paths, new_checkpoint, unet_state_dict, additional_replacements=[meta_path], config=config
+        )
+
+        if len(attentions):
+            paths = renew_attention_paths(attentions)
+            meta_path = {"old": f"input_blocks.{i}.1", "new": f"down_blocks.{block_id}.attentions.{layer_in_block_id}"}
+            assign_to_checkpoint(
+                paths, new_checkpoint, unet_state_dict, additional_replacements=[meta_path], config=config
+            )
+
+    resnet_0 = middle_blocks[0]
+    attentions = middle_blocks[1]
+    resnet_1 = middle_blocks[2]
+
+    resnet_0_paths = renew_resnet_paths(resnet_0)
+    assign_to_checkpoint(resnet_0_paths, new_checkpoint, unet_state_dict, config=config)
+
+    resnet_1_paths = renew_resnet_paths(resnet_1)
+    assign_to_checkpoint(resnet_1_paths, new_checkpoint, unet_state_dict, config=config)
+
+    attentions_paths = renew_attention_paths(attentions)
+    meta_path = {"old": "middle_block.1", "new": "mid_block.attentions.0"}
+    assign_to_checkpoint(
+        attentions_paths, new_checkpoint, unet_state_dict, additional_replacements=[meta_path], config=config
+    )
+
+    for i in range(num_output_blocks):
+        block_id = i // (config["layers_per_block"] + 1)
+        layer_in_block_id = i % (config["layers_per_block"] + 1)
+        output_block_layers = [shave_segments(name, 2) for name in output_blocks[i]]
+        output_block_list = {}
+
+        for layer in output_block_layers:
+            layer_id, layer_name = layer.split(".")[0], shave_segments(layer, 1)
+            if layer_id in output_block_list:
+                output_block_list[layer_id].append(layer_name)
+            else:
+                output_block_list[layer_id] = [layer_name]
+
+        if len(output_block_list) > 1:
+            resnets = [key for key in output_blocks[i] if f"output_blocks.{i}.0" in key]
+            attentions = [key for key in output_blocks[i] if f"output_blocks.{i}.1" in key]
+
+            paths = renew_resnet_paths(resnets)
+
+            meta_path = {"old": f"output_blocks.{i}.0", "new": f"up_blocks.{block_id}.resnets.{layer_in_block_id}"}
+            assign_to_checkpoint(
+                paths, new_checkpoint, unet_state_dict, additional_replacements=[meta_path], config=config
+            )
+
+            if ["conv.weight", "conv.bias"] in output_block_list.values():
+                index = list(output_block_list.values()).index(["conv.weight", "conv.bias"])
+                new_checkpoint[f"up_blocks.{block_id}.upsamplers.0.conv.weight"] = unet_state_dict[
+                    f"output_blocks.{i}.{index}.conv.weight"
+                ]
+                new_checkpoint[f"up_blocks.{block_id}.upsamplers.0.conv.bias"] = unet_state_dict[
+                    f"output_blocks.{i}.{index}.conv.bias"
+                ]
+                # Clear attentions as they have been attributed above.
+                if len(attentions) == 2:
+                    attentions = []
+            elif f"output_blocks.{i}.1.weight" in unet_state_dict:
+                # text_unet uses linear layers in place of upsamplers
+                shape = unet_state_dict[f"output_blocks.{i}.1.weight"].shape
+                if shape[0] != shape[1]:
+                    continue
+                new_checkpoint[f"up_blocks.{block_id}.upsamplers.0.weight"] = unet_state_dict.pop(
+                    f"output_blocks.{i}.1.weight"
+                )
+                new_checkpoint[f"up_blocks.{block_id}.upsamplers.0.bias"] = unet_state_dict.pop(
+                    f"output_blocks.{i}.1.bias"
+                )
+                # Clear attentions as they have been attributed above.
+                if len(attentions) == 2:
+                    attentions = []
+            elif f"output_blocks.{i}.2.weight" in unet_state_dict:
+                # text_unet uses linear layers in place of upsamplers
+                shape = unet_state_dict[f"output_blocks.{i}.2.weight"].shape
+                if shape[0] != shape[1]:
+                    continue
+                new_checkpoint[f"up_blocks.{block_id}.upsamplers.0.weight"] = unet_state_dict.pop(
+                    f"output_blocks.{i}.2.weight"
+                )
+                new_checkpoint[f"up_blocks.{block_id}.upsamplers.0.bias"] = unet_state_dict.pop(
+                    f"output_blocks.{i}.2.bias"
+                )
+
+            if len(attentions):
+                paths = renew_attention_paths(attentions)
+                meta_path = {
+                    "old": f"output_blocks.{i}.1",
+                    "new": f"up_blocks.{block_id}.attentions.{layer_in_block_id}",
+                }
+                assign_to_checkpoint(
+                    paths, new_checkpoint, unet_state_dict, additional_replacements=[meta_path], config=config
+                )
+        else:
+            resnet_0_paths = renew_resnet_paths(output_block_layers, n_shave_prefix_segments=1)
+            for path in resnet_0_paths:
+                old_path = ".".join(["output_blocks", str(i), path["old"]])
+                new_path = ".".join(["up_blocks", str(block_id), "resnets", str(layer_in_block_id), path["new"]])
+
+                new_checkpoint[new_path] = unet_state_dict[old_path]
+
+    return new_checkpoint
+
+
+def convert_vd_vae_checkpoint(checkpoint, config):
+    # extract state dict for VAE
+    vae_state_dict = {}
+    keys = list(checkpoint.keys())
+    for key in keys:
+        vae_state_dict[key] = checkpoint.get(key)
+
+    new_checkpoint = {}
+
+    new_checkpoint["encoder.conv_in.weight"] = vae_state_dict["encoder.conv_in.weight"]
+    new_checkpoint["encoder.conv_in.bias"] = vae_state_dict["encoder.conv_in.bias"]
+    new_checkpoint["encoder.conv_out.weight"] = vae_state_dict["encoder.conv_out.weight"]
+    new_checkpoint["encoder.conv_out.bias"] = vae_state_dict["encoder.conv_out.bias"]
+    new_checkpoint["encoder.conv_norm_out.weight"] = vae_state_dict["encoder.norm_out.weight"]
+    new_checkpoint["encoder.conv_norm_out.bias"] = vae_state_dict["encoder.norm_out.bias"]
+
+    new_checkpoint["decoder.conv_in.weight"] = vae_state_dict["decoder.conv_in.weight"]
+    new_checkpoint["decoder.conv_in.bias"] = vae_state_dict["decoder.conv_in.bias"]
+    new_checkpoint["decoder.conv_out.weight"] = vae_state_dict["decoder.conv_out.weight"]
+    new_checkpoint["decoder.conv_out.bias"] = vae_state_dict["decoder.conv_out.bias"]
+    new_checkpoint["decoder.conv_norm_out.weight"] = vae_state_dict["decoder.norm_out.weight"]
+    new_checkpoint["decoder.conv_norm_out.bias"] = vae_state_dict["decoder.norm_out.bias"]
+
+    new_checkpoint["quant_conv.weight"] = vae_state_dict["quant_conv.weight"]
+    new_checkpoint["quant_conv.bias"] = vae_state_dict["quant_conv.bias"]
+    new_checkpoint["post_quant_conv.weight"] = vae_state_dict["post_quant_conv.weight"]
+    new_checkpoint["post_quant_conv.bias"] = vae_state_dict["post_quant_conv.bias"]
+
+    # Retrieves the keys for the encoder down blocks only
+    num_down_blocks = len({".".join(layer.split(".")[:3]) for layer in vae_state_dict if "encoder.down" in layer})
+    down_blocks = {
+        layer_id: [key for key in vae_state_dict if f"down.{layer_id}" in key] for layer_id in range(num_down_blocks)
+    }
+
+    # Retrieves the keys for the decoder up blocks only
+    num_up_blocks = len({".".join(layer.split(".")[:3]) for layer in vae_state_dict if "decoder.up" in layer})
+    up_blocks = {
+        layer_id: [key for key in vae_state_dict if f"up.{layer_id}" in key] for layer_id in range(num_up_blocks)
+    }
+
+    for i in range(num_down_blocks):
+        resnets = [key for key in down_blocks[i] if f"down.{i}" in key and f"down.{i}.downsample" not in key]
+
+        if f"encoder.down.{i}.downsample.conv.weight" in vae_state_dict:
+            new_checkpoint[f"encoder.down_blocks.{i}.downsamplers.0.conv.weight"] = vae_state_dict.pop(
+                f"encoder.down.{i}.downsample.conv.weight"
+            )
+            new_checkpoint[f"encoder.down_blocks.{i}.downsamplers.0.conv.bias"] = vae_state_dict.pop(
+                f"encoder.down.{i}.downsample.conv.bias"
+            )
+
+        paths = renew_vae_resnet_paths(resnets)
+        meta_path = {"old": f"down.{i}.block", "new": f"down_blocks.{i}.resnets"}
+        assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+
+    mid_resnets = [key for key in vae_state_dict if "encoder.mid.block" in key]
+    num_mid_res_blocks = 2
+    for i in range(1, num_mid_res_blocks + 1):
+        resnets = [key for key in mid_resnets if f"encoder.mid.block_{i}" in key]
+
+        paths = renew_vae_resnet_paths(resnets)
+        meta_path = {"old": f"mid.block_{i}", "new": f"mid_block.resnets.{i - 1}"}
+        assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+
+    mid_attentions = [key for key in vae_state_dict if "encoder.mid.attn" in key]
+    paths = renew_vae_attention_paths(mid_attentions)
+    meta_path = {"old": "mid.attn_1", "new": "mid_block.attentions.0"}
+    assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+    conv_attn_to_linear(new_checkpoint)
+
+    for i in range(num_up_blocks):
+        block_id = num_up_blocks - 1 - i
+        resnets = [
+            key for key in up_blocks[block_id] if f"up.{block_id}" in key and f"up.{block_id}.upsample" not in key
+        ]
+
+        if f"decoder.up.{block_id}.upsample.conv.weight" in vae_state_dict:
+            new_checkpoint[f"decoder.up_blocks.{i}.upsamplers.0.conv.weight"] = vae_state_dict[
+                f"decoder.up.{block_id}.upsample.conv.weight"
+            ]
+            new_checkpoint[f"decoder.up_blocks.{i}.upsamplers.0.conv.bias"] = vae_state_dict[
+                f"decoder.up.{block_id}.upsample.conv.bias"
+            ]
+
+        paths = renew_vae_resnet_paths(resnets)
+        meta_path = {"old": f"up.{block_id}.block", "new": f"up_blocks.{i}.resnets"}
+        assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+
+    mid_resnets = [key for key in vae_state_dict if "decoder.mid.block" in key]
+    num_mid_res_blocks = 2
+    for i in range(1, num_mid_res_blocks + 1):
+        resnets = [key for key in mid_resnets if f"decoder.mid.block_{i}" in key]
+
+        paths = renew_vae_resnet_paths(resnets)
+        meta_path = {"old": f"mid.block_{i}", "new": f"mid_block.resnets.{i - 1}"}
+        assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+
+    mid_attentions = [key for key in vae_state_dict if "decoder.mid.attn" in key]
+    paths = renew_vae_attention_paths(mid_attentions)
+    meta_path = {"old": "mid.attn_1", "new": "mid_block.attentions.0"}
+    assign_to_checkpoint(paths, new_checkpoint, vae_state_dict, additional_replacements=[meta_path], config=config)
+    conv_attn_to_linear(new_checkpoint)
+    return new_checkpoint
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "--unet_checkpoint_path", default=None, type=str, required=False, help="Path to the checkpoint to convert."
+    )
+    parser.add_argument(
+        "--vae_checkpoint_path", default=None, type=str, required=False, help="Path to the checkpoint to convert."
+    )
+    parser.add_argument(
+        "--optimus_checkpoint_path", default=None, type=str, required=False, help="Path to the checkpoint to convert."
+    )
+    parser.add_argument(
+        "--scheduler_type",
+        default="pndm",
+        type=str,
+        help="Type of scheduler to use. Should be one of ['pndm', 'lms', 'ddim', 'euler', 'euler-ancest', 'dpm']",
+    )
+    parser.add_argument(
+        "--extract_ema",
+        action="store_true",
+        help=(
+            "Only relevant for checkpoints that have both EMA and non-EMA weights. Whether to extract the EMA weights"
+            " or not. Defaults to `False`. Add `--extract_ema` to extract the EMA weights. EMA weights usually yield"
+            " higher quality images for inference. Non-EMA weights are usually better to continue fine-tuning."
+        ),
+    )
+    parser.add_argument("--dump_path", default=None, type=str, required=True, help="Path to the output model.")
+
+    args = parser.parse_args()
+
+    scheduler_config = SCHEDULER_CONFIG
+
+    num_train_timesteps = scheduler_config.timesteps
+    beta_start = scheduler_config.beta_linear_start
+    beta_end = scheduler_config.beta_linear_end
+    if args.scheduler_type == "pndm":
+        scheduler = PNDMScheduler(
+            beta_end=beta_end,
+            beta_schedule="scaled_linear",
+            beta_start=beta_start,
+            num_train_timesteps=num_train_timesteps,
+            skip_prk_steps=True,
+            steps_offset=1,
+        )
+    elif args.scheduler_type == "lms":
+        scheduler = LMSDiscreteScheduler(beta_start=beta_start, beta_end=beta_end, beta_schedule="scaled_linear")
+    elif args.scheduler_type == "euler":
+        scheduler = EulerDiscreteScheduler(beta_start=beta_start, beta_end=beta_end, beta_schedule="scaled_linear")
+    elif args.scheduler_type == "euler-ancestral":
+        scheduler = EulerAncestralDiscreteScheduler(
+            beta_start=beta_start, beta_end=beta_end, beta_schedule="scaled_linear"
+        )
+    elif args.scheduler_type == "dpm":
+        scheduler = DPMSolverMultistepScheduler(
+            beta_start=beta_start, beta_end=beta_end, beta_schedule="scaled_linear"
+        )
+    elif args.scheduler_type == "ddim":
+        scheduler = DDIMScheduler(
+            beta_start=beta_start,
+            beta_end=beta_end,
+            beta_schedule="scaled_linear",
+            clip_sample=False,
+            set_alpha_to_one=False,
+            steps_offset=1,
+        )
+    else:
+        raise ValueError(f"Scheduler of type {args.scheduler_type} doesn't exist!")
+
+    # Convert the UNet2DConditionModel models.
+    if args.unet_checkpoint_path is not None:
+        # image UNet
+        image_unet_config = create_image_unet_diffusers_config(IMAGE_UNET_CONFIG)
+        checkpoint = torch.load(args.unet_checkpoint_path)
+        converted_image_unet_checkpoint = convert_vd_unet_checkpoint(
+            checkpoint, image_unet_config, unet_key="model.diffusion_model.unet_image.", extract_ema=args.extract_ema
+        )
+        image_unet = UNet2DConditionModel(**image_unet_config)
+        image_unet.load_state_dict(converted_image_unet_checkpoint)
+
+        # text UNet
+        text_unet_config = create_text_unet_diffusers_config(TEXT_UNET_CONFIG)
+        converted_text_unet_checkpoint = convert_vd_unet_checkpoint(
+            checkpoint, text_unet_config, unet_key="model.diffusion_model.unet_text.", extract_ema=args.extract_ema
+        )
+        text_unet = UNetFlatConditionModel(**text_unet_config)
+        text_unet.load_state_dict(converted_text_unet_checkpoint)
+
+    # Convert the VAE model.
+    if args.vae_checkpoint_path is not None:
+        vae_config = create_vae_diffusers_config(AUTOENCODER_CONFIG)
+        checkpoint = torch.load(args.vae_checkpoint_path)
+        converted_vae_checkpoint = convert_vd_vae_checkpoint(checkpoint, vae_config)
+
+        vae = AutoencoderKL(**vae_config)
+        vae.load_state_dict(converted_vae_checkpoint)
+
+    tokenizer = CLIPTokenizer.from_pretrained("openai/clip-vit-large-patch14")
+    image_feature_extractor = CLIPFeatureExtractor.from_pretrained("openai/clip-vit-large-patch14")
+    text_encoder = CLIPTextModelWithProjection.from_pretrained("openai/clip-vit-large-patch14")
+    image_encoder = CLIPVisionModelWithProjection.from_pretrained("openai/clip-vit-large-patch14")
+
+    pipe = VersatileDiffusionPipeline(
+        scheduler=scheduler,
+        tokenizer=tokenizer,
+        image_feature_extractor=image_feature_extractor,
+        text_encoder=text_encoder,
+        image_encoder=image_encoder,
+        image_unet=image_unet,
+        text_unet=text_unet,
+        vae=vae,
+    )
+    pipe.save_pretrained(args.dump_path)

scripts/v1-inference.yaml

@@ -0,0 +1,70 @@
+model:
+  base_learning_rate: 1.0e-04
+  target: ldm.models.diffusion.ddpm.LatentDiffusion
+  params:
+    linear_start: 0.00085
+    linear_end: 0.0120
+    num_timesteps_cond: 1
+    log_every_t: 200
+    timesteps: 1000
+    first_stage_key: "jpg"
+    cond_stage_key: "txt"
+    image_size: 64
+    channels: 4
+    cond_stage_trainable: false   # Note: different from the one we trained before
+    conditioning_key: crossattn
+    monitor: val/loss_simple_ema
+    scale_factor: 0.18215
+    use_ema: False
+
+    scheduler_config: # 10000 warmup steps
+      target: ldm.lr_scheduler.LambdaLinearScheduler
+      params:
+        warm_up_steps: [ 10000 ]
+        cycle_lengths: [ 10000000000000 ] # incredibly large number to prevent corner cases
+        f_start: [ 1.e-6 ]
+        f_max: [ 1. ]
+        f_min: [ 1. ]
+
+    unet_config:
+      target: ldm.modules.diffusionmodules.openaimodel.UNetModel
+      params:
+        image_size: 32 # unused
+        in_channels: 4
+        out_channels: 4
+        model_channels: 320
+        attention_resolutions: [ 4, 2, 1 ]
+        num_res_blocks: 2
+        channel_mult: [ 1, 2, 4, 4 ]
+        num_heads: 8
+        use_spatial_transformer: True
+        transformer_depth: 1
+        context_dim: 768
+        use_checkpoint: True
+        legacy: False
+
+    first_stage_config:
+      target: ldm.models.autoencoder.AutoencoderKL
+      params:
+        embed_dim: 4
+        monitor: val/rec_loss
+        ddconfig:
+          double_z: true
+          z_channels: 4
+          resolution: 256
+          in_channels: 3
+          out_ch: 3
+          ch: 128
+          ch_mult:
+          - 1
+          - 2
+          - 4
+          - 4
+          num_res_blocks: 2
+          attn_resolutions: []
+          dropout: 0.0
+        lossconfig:
+          target: torch.nn.Identity
+
+    cond_stage_config:
+      target: ldm.modules.encoders.modules.FrozenCLIPEmbedder

setup.py

@@ -97,6 +97,7 @@ _deps = [
     "pytest",
     "pytest-timeout",
     "pytest-xdist",
+    "safetensors",
     "sentencepiece>=0.1.91,!=0.1.92",
     "scipy",
     "regex!=2019.12.17",
@@ -184,10 +185,11 @@ extras["test"] = deps_list(
     "pytest",
     "pytest-timeout",
     "pytest-xdist",
+    "safetensors",
     "sentencepiece",
     "scipy",
     "torchvision",
-    "transformers"
+    "transformers",
 )
 extras["torch"] = deps_list("torch", "accelerate")
 
@@ -212,7 +214,7 @@ install_requires = [
 
 setup(
     name="diffusers",
-    version="0.8.0.dev0",  # expected format is one of x.y.z.dev0, or x.y.z.rc1 or x.y.z (no to dashes, yes to dots)
+    version="0.9.0",  # expected format is one of x.y.z.dev0, or x.y.z.rc1 or x.y.z (no to dashes, yes to dots)
     description="Diffusers",
     long_description=open("README.md", "r", encoding="utf-8").read(),
     long_description_content_type="text/markdown",

src/diffusers/__init__.py

@@ -9,7 +9,7 @@ from .utils import (
 )
 
 
-__version__ = "0.8.0.dev0"
+__version__ = "0.9.0"
 
 from .configuration_utils import ConfigMixin
 from .onnx_utils import OnnxRuntimeModel
@@ -46,8 +46,11 @@ if is_torch_available():
         DPMSolverMultistepScheduler,
         EulerAncestralDiscreteScheduler,
         EulerDiscreteScheduler,
+        HeunDiscreteScheduler,
         IPNDMScheduler,
         KarrasVeScheduler,
+        KDPM2AncestralDiscreteScheduler,
+        KDPM2DiscreteScheduler,
         PNDMScheduler,
         RePaintScheduler,
         SchedulerMixin,
@@ -69,11 +72,17 @@ if is_torch_available() and is_transformers_available():
         AltDiffusionPipeline,
         CycleDiffusionPipeline,
         LDMTextToImagePipeline,
+        StableDiffusionImageVariationPipeline,
         StableDiffusionImg2ImgPipeline,
         StableDiffusionInpaintPipeline,
         StableDiffusionInpaintPipelineLegacy,
         StableDiffusionPipeline,
-        StableDiffusionUpscalerPipeline,
+        StableDiffusionPipelineSafe,
+        StableDiffusionUpscalePipeline,
+        VersatileDiffusionDualGuidedPipeline,
+        VersatileDiffusionImageVariationPipeline,
+        VersatileDiffusionPipeline,
+        VersatileDiffusionTextToImagePipeline,
         VQDiffusionPipeline,
     )
 else:
@@ -83,6 +92,7 @@ if is_torch_available() and is_transformers_available() and is_onnx_available():
     from .pipelines import (
         OnnxStableDiffusionImg2ImgPipeline,
         OnnxStableDiffusionInpaintPipeline,
+        OnnxStableDiffusionInpaintPipelineLegacy,
         OnnxStableDiffusionPipeline,
         StableDiffusionOnnxPipeline,
     )

src/diffusers/configuration_utils.py

@@ -24,6 +24,8 @@ import re
 from collections import OrderedDict
 from typing import Any, Dict, Tuple, Union
 
+import numpy as np
+
 from huggingface_hub import hf_hub_download
 from huggingface_hub.utils import EntryNotFoundError, RepositoryNotFoundError, RevisionNotFoundError
 from requests import HTTPError
@@ -80,20 +82,21 @@ class ConfigMixin:
         - **config_name** (`str`) -- A filename under which the config should stored when calling
           [`~ConfigMixin.save_config`] (should be overridden by parent class).
         - **ignore_for_config** (`List[str]`) -- A list of attributes that should not be saved in the config (should be
-          overridden by parent class).
-        - **has_compatibles** (`bool`) -- Whether the class has compatible classes (should be overridden by parent
-          class).
+          overridden by subclass).
+        - **has_compatibles** (`bool`) -- Whether the class has compatible classes (should be overridden by subclass).
+        - **_deprecated_kwargs** (`List[str]`) -- Keyword arguments that are deprecated. Note that the init function
+          should only have a `kwargs` argument if at least one argument is deprecated (should be overridden by
+          subclass).
     """
     config_name = None
     ignore_for_config = []
     has_compatibles = False
 
+    _deprecated_kwargs = []
+
     def register_to_config(self, **kwargs):
         if self.config_name is None:
             raise NotImplementedError(f"Make sure that {self.__class__} has defined a class name `config_name`")
-        kwargs["_class_name"] = self.__class__.__name__
-        kwargs["_diffusers_version"] = __version__
-
         # Special case for `kwargs` used in deprecation warning added to schedulers
         # TODO: remove this when we remove the deprecation warning, and the `kwargs` argument,
         # or solve in a more general way.
@@ -198,6 +201,11 @@ class ConfigMixin:
         if "dtype" in unused_kwargs:
             init_dict["dtype"] = unused_kwargs.pop("dtype")
 
+        # add possible deprecated kwargs
+        for deprecated_kwarg in cls._deprecated_kwargs:
+            if deprecated_kwarg in unused_kwargs:
+                init_dict[deprecated_kwarg] = unused_kwargs.pop(deprecated_kwarg)
+
         # Return model and optionally state and/or unused_kwargs
         model = cls(**init_dict)
 
@@ -462,7 +470,7 @@ class ConfigMixin:
         unused_kwargs = {**config_dict, **kwargs}
 
         # 7. Define "hidden" config parameters that were saved for compatible classes
-        hidden_config_dict = {k: v for k, v in original_dict.items() if k not in init_dict and not k.startswith("_")}
+        hidden_config_dict = {k: v for k, v in original_dict.items() if k not in init_dict}
 
         return init_dict, unused_kwargs, hidden_config_dict
 
@@ -493,6 +501,15 @@ class ConfigMixin:
             `str`: String containing all the attributes that make up this configuration instance in JSON format.
         """
         config_dict = self._internal_dict if hasattr(self, "_internal_dict") else {}
+        config_dict["_class_name"] = self.__class__.__name__
+        config_dict["_diffusers_version"] = __version__
+
+        def to_json_saveable(value):
+            if isinstance(value, np.ndarray):
+                value = value.tolist()
+            return value
+
+        config_dict = {k: to_json_saveable(v) for k, v in config_dict.items()}
         return json.dumps(config_dict, indent=2, sort_keys=True) + "\n"
 
     def to_json_file(self, json_file_path: Union[str, os.PathLike]):
@@ -520,7 +537,7 @@ def register_to_config(init):
     def inner_init(self, *args, **kwargs):
         # Ignore private kwargs in the init.
         init_kwargs = {k: v for k, v in kwargs.items() if not k.startswith("_")}
-        init(self, *args, **init_kwargs)
+        config_init_kwargs = {k: v for k, v in kwargs.items() if k.startswith("_")}
         if not isinstance(self, ConfigMixin):
             raise RuntimeError(
                 f"`@register_for_config` was applied to {self.__class__.__name__} init method, but this class does "
@@ -545,7 +562,9 @@ def register_to_config(init):
                 if k not in ignore and k not in new_kwargs
             }
         )
+        new_kwargs = {**config_init_kwargs, **new_kwargs}
         getattr(self, "register_to_config")(**new_kwargs)
+        init(self, *args, **init_kwargs)
 
     return inner_init
 
@@ -562,7 +581,7 @@ def flax_register_to_config(cls):
             )
 
         # Ignore private kwargs in the init. Retrieve all passed attributes
-        init_kwargs = {k: v for k, v in kwargs.items() if not k.startswith("_")}
+        init_kwargs = {k: v for k, v in kwargs.items()}
 
         # Retrieve default values
         fields = dataclasses.fields(self)

src/diffusers/dependency_versions_table.py

@@ -21,6 +21,7 @@ deps = {
     "pytest": "pytest",
     "pytest-timeout": "pytest-timeout",
     "pytest-xdist": "pytest-xdist",
+    "safetensors": "safetensors",
     "sentencepiece": "sentencepiece>=0.1.91,!=0.1.92",
     "scipy": "scipy",
     "regex": "regex!=2019.12.17",

src/diffusers/experimental/rl/value_guided_sampling.py

@@ -89,6 +89,7 @@ class ValueGuidedRLPipeline(DiffusionPipeline):
                 x = x + scale * grad
                 x = self.reset_x0(x, conditions, self.action_dim)
             prev_x = self.unet(x.permute(0, 2, 1), timesteps).sample.permute(0, 2, 1)
+            # TODO: set prediction_type when instantiating the model
             x = self.scheduler.step(prev_x, i, x, predict_epsilon=False)["prev_sample"]
 
             # apply conditions to the trajectory

src/diffusers/modeling_flax_utils.py

@@ -332,7 +332,7 @@ class FlaxModelMixin:
             elif os.path.isfile(os.path.join(pretrained_path_with_subfolder, WEIGHTS_NAME)):
                 raise EnvironmentError(
                     f"{WEIGHTS_NAME} file found in directory {pretrained_path_with_subfolder}. Please load the model"
-                    " using  `from_pt=True`."
+                    " using `from_pt=True`."
                 )
             else:
                 raise EnvironmentError(

src/diffusers/modeling_utils.py

@@ -30,8 +30,10 @@ from .utils import (
     CONFIG_NAME,
     DIFFUSERS_CACHE,
     HUGGINGFACE_CO_RESOLVE_ENDPOINT,
+    SAFETENSORS_WEIGHTS_NAME,
     WEIGHTS_NAME,
     is_accelerate_available,
+    is_safetensors_available,
     is_torch_version,
     logging,
 )
@@ -51,6 +53,9 @@ if is_accelerate_available():
     from accelerate.utils import set_module_tensor_to_device
     from accelerate.utils.versions import is_torch_version
 
+if is_safetensors_available():
+    import safetensors
+
 
 def get_parameter_device(parameter: torch.nn.Module):
     try:
@@ -84,10 +89,13 @@ def get_parameter_dtype(parameter: torch.nn.Module):
 
 def load_state_dict(checkpoint_file: Union[str, os.PathLike]):
     """
-    Reads a PyTorch checkpoint file, returning properly formatted errors if they arise.
+    Reads a checkpoint file, returning properly formatted errors if they arise.
     """
     try:
-        return torch.load(checkpoint_file, map_location="cpu")
+        if os.path.basename(checkpoint_file) == WEIGHTS_NAME:
+            return torch.load(checkpoint_file, map_location="cpu")
+        else:
+            return safetensors.torch.load_file(checkpoint_file, device="cpu")
     except Exception as e:
         try:
             with open(checkpoint_file) as f:
@@ -104,7 +112,7 @@ def load_state_dict(checkpoint_file: Union[str, os.PathLike]):
                     ) from e
         except (UnicodeDecodeError, ValueError):
             raise OSError(
-                f"Unable to load weights from pytorch checkpoint file for '{checkpoint_file}' "
+                f"Unable to load weights from checkpoint file for '{checkpoint_file}' "
                 f"at '{checkpoint_file}'. "
                 "If you tried to load a PyTorch model from a TF 2.0 checkpoint, please set from_tf=True."
             )
@@ -332,7 +340,7 @@ class ModelMixin(torch.nn.Module):
 
         if low_cpu_mem_usage and not is_accelerate_available():
             low_cpu_mem_usage = False
-            logger.warn(
+            logger.warning(
                 "Cannot initialize model with low cpu memory usage because `accelerate` was not found in the"
                 " environment. Defaulting to `low_cpu_mem_usage=False`. It is strongly recommended to install"
                 " `accelerate` for faster and less memory-intense model loading. You can do so with: \n```\npip"
@@ -375,80 +383,44 @@ class ModelMixin(torch.nn.Module):
 
         # This variable will flag if we're loading a sharded checkpoint. In this case the archive file is just the
         # Load model
-        pretrained_model_name_or_path = str(pretrained_model_name_or_path)
-        if os.path.isdir(pretrained_model_name_or_path):
-            if os.path.isfile(os.path.join(pretrained_model_name_or_path, WEIGHTS_NAME)):
-                # Load from a PyTorch checkpoint
-                model_file = os.path.join(pretrained_model_name_or_path, WEIGHTS_NAME)
-            elif subfolder is not None and os.path.isfile(
-                os.path.join(pretrained_model_name_or_path, subfolder, WEIGHTS_NAME)
-            ):
-                model_file = os.path.join(pretrained_model_name_or_path, subfolder, WEIGHTS_NAME)
-            else:
-                raise EnvironmentError(
-                    f"Error no file named {WEIGHTS_NAME} found in directory {pretrained_model_name_or_path}."
-                )
-        else:
+
+        model_file = None
+        if is_safetensors_available():
             try:
-                # Load from URL or cache if already cached
-                model_file = hf_hub_download(
+                model_file = _get_model_file(
                     pretrained_model_name_or_path,
-                    filename=WEIGHTS_NAME,
+                    weights_name=SAFETENSORS_WEIGHTS_NAME,
                     cache_dir=cache_dir,
                     force_download=force_download,
-                    proxies=proxies,
                     resume_download=resume_download,
+                    proxies=proxies,
                     local_files_only=local_files_only,
                     use_auth_token=use_auth_token,
-                    user_agent=user_agent,
-                    subfolder=subfolder,
                     revision=revision,
+                    subfolder=subfolder,
+                    user_agent=user_agent,
                 )
-
-            except RepositoryNotFoundError:
-                raise EnvironmentError(
-                    f"{pretrained_model_name_or_path} is not a local folder and is not a valid model identifier "
-                    "listed on 'https://huggingface.co/models'\nIf this is a private repository, make sure to pass a "
-                    "token having permission to this repo with `use_auth_token` or log in with `huggingface-cli "
-                    "login`."
-                )
-            except RevisionNotFoundError:
-                raise EnvironmentError(
-                    f"{revision} is not a valid git identifier (branch name, tag name or commit id) that exists for "
-                    "this model name. Check the model page at "
-                    f"'https://huggingface.co/{pretrained_model_name_or_path}' for available revisions."
-                )
-            except EntryNotFoundError:
-                raise EnvironmentError(
-                    f"{pretrained_model_name_or_path} does not appear to have a file named {WEIGHTS_NAME}."
-                )
-            except HTTPError as err:
-                raise EnvironmentError(
-                    "There was a specific connection error when trying to load"
-                    f" {pretrained_model_name_or_path}:\n{err}"
-                )
-            except ValueError:
-                raise EnvironmentError(
-                    f"We couldn't connect to '{HUGGINGFACE_CO_RESOLVE_ENDPOINT}' to load this model, couldn't find it"
-                    f" in the cached files and it looks like {pretrained_model_name_or_path} is not the path to a"
-                    f" directory containing a file named {WEIGHTS_NAME} or"
-                    " \nCheckout your internet connection or see how to run the library in"
-                    " offline mode at 'https://huggingface.co/docs/diffusers/installation#offline-mode'."
-                )
-            except EnvironmentError:
-                raise EnvironmentError(
-                    f"Can't load the model for '{pretrained_model_name_or_path}'. If you were trying to load it from "
-                    "'https://huggingface.co/models', make sure you don't have a local directory with the same name. "
-                    f"Otherwise, make sure '{pretrained_model_name_or_path}' is the correct path to a directory "
-                    f"containing a file named {WEIGHTS_NAME}"
-                )
-
-            # restore default dtype
+            except:
+                pass
+        if model_file is None:
+            model_file = _get_model_file(
+                pretrained_model_name_or_path,
+                weights_name=WEIGHTS_NAME,
+                cache_dir=cache_dir,
+                force_download=force_download,
+                resume_download=resume_download,
+                proxies=proxies,
+                local_files_only=local_files_only,
+                use_auth_token=use_auth_token,
+                revision=revision,
+                subfolder=subfolder,
+                user_agent=user_agent,
+            )
 
         if low_cpu_mem_usage:
             # Instantiate model with empty weights
             with accelerate.init_empty_weights():
-                model, unused_kwargs = cls.from_config(
+                config, unused_kwargs = cls.load_config(
                     config_path,
                     cache_dir=cache_dir,
                     return_unused_kwargs=True,
@@ -462,6 +434,7 @@ class ModelMixin(torch.nn.Module):
                     device_map=device_map,
                     **kwargs,
                 )
+                model = cls.from_config(config, **unused_kwargs)
 
             # if device_map is Non,e load the state dict on move the params from meta device to the cpu
             if device_map is None:
@@ -482,7 +455,7 @@ class ModelMixin(torch.nn.Module):
                 "error_msgs": [],
             }
         else:
-            model, unused_kwargs = cls.from_config(
+            config, unused_kwargs = cls.load_config(
                 config_path,
                 cache_dir=cache_dir,
                 return_unused_kwargs=True,
@@ -496,8 +469,24 @@ class ModelMixin(torch.nn.Module):
                 device_map=device_map,
                 **kwargs,
             )
+            model = cls.from_config(config, **unused_kwargs)
 
             state_dict = load_state_dict(model_file)
+            dtype = set(v.dtype for v in state_dict.values())
+
+            if len(dtype) > 1 and torch.float32 not in dtype:
+                raise ValueError(
+                    f"The weights of the model file {model_file} have a mixture of incompatible dtypes {dtype}. Please"
+                    f" make sure that {model_file} weights have only one dtype."
+                )
+            elif len(dtype) > 1 and torch.float32 in dtype:
+                dtype = torch.float32
+            else:
+                dtype = dtype.pop()
+
+            # move model to correct dtype
+            model = model.to(dtype)
+
             model, missing_keys, unexpected_keys, mismatched_keys, error_msgs = cls._load_pretrained_model(
                 model,
                 state_dict,
@@ -689,3 +678,88 @@ def unwrap_model(model: torch.nn.Module) -> torch.nn.Module:
         return unwrap_model(model.module)
     else:
         return model
+
+
+def _get_model_file(
+    pretrained_model_name_or_path,
+    *,
+    weights_name,
+    subfolder,
+    cache_dir,
+    force_download,
+    proxies,
+    resume_download,
+    local_files_only,
+    use_auth_token,
+    user_agent,
+    revision,
+):
+    pretrained_model_name_or_path = str(pretrained_model_name_or_path)
+    if os.path.isdir(pretrained_model_name_or_path):
+        if os.path.isfile(os.path.join(pretrained_model_name_or_path, weights_name)):
+            # Load from a PyTorch checkpoint
+            model_file = os.path.join(pretrained_model_name_or_path, weights_name)
+            return model_file
+        elif subfolder is not None and os.path.isfile(
+            os.path.join(pretrained_model_name_or_path, subfolder, weights_name)
+        ):
+            model_file = os.path.join(pretrained_model_name_or_path, subfolder, weights_name)
+            return model_file
+        else:
+            raise EnvironmentError(
+                f"Error no file named {weights_name} found in directory {pretrained_model_name_or_path}."
+            )
+    else:
+        try:
+            # Load from URL or cache if already cached
+            model_file = hf_hub_download(
+                pretrained_model_name_or_path,
+                filename=weights_name,
+                cache_dir=cache_dir,
+                force_download=force_download,
+                proxies=proxies,
+                resume_download=resume_download,
+                local_files_only=local_files_only,
+                use_auth_token=use_auth_token,
+                user_agent=user_agent,
+                subfolder=subfolder,
+                revision=revision,
+            )
+            return model_file
+
+        except RepositoryNotFoundError:
+            raise EnvironmentError(
+                f"{pretrained_model_name_or_path} is not a local folder and is not a valid model identifier "
+                "listed on 'https://huggingface.co/models'\nIf this is a private repository, make sure to pass a "
+                "token having permission to this repo with `use_auth_token` or log in with `huggingface-cli "
+                "login`."
+            )
+        except RevisionNotFoundError:
+            raise EnvironmentError(
+                f"{revision} is not a valid git identifier (branch name, tag name or commit id) that exists for "
+                "this model name. Check the model page at "
+                f"'https://huggingface.co/{pretrained_model_name_or_path}' for available revisions."
+            )
+        except EntryNotFoundError:
+            raise EnvironmentError(
+                f"{pretrained_model_name_or_path} does not appear to have a file named {weights_name}."
+            )
+        except HTTPError as err:
+            raise EnvironmentError(
+                f"There was a specific connection error when trying to load {pretrained_model_name_or_path}:\n{err}"
+            )
+        except ValueError:
+            raise EnvironmentError(
+                f"We couldn't connect to '{HUGGINGFACE_CO_RESOLVE_ENDPOINT}' to load this model, couldn't find it"
+                f" in the cached files and it looks like {pretrained_model_name_or_path} is not the path to a"
+                f" directory containing a file named {weights_name} or"
+                " \nCheckout your internet connection or see how to run the library in"
+                " offline mode at 'https://huggingface.co/docs/diffusers/installation#offline-mode'."
+            )
+        except EnvironmentError:
+            raise EnvironmentError(
+                f"Can't load the model for '{pretrained_model_name_or_path}'. If you were trying to load it from "
+                "'https://huggingface.co/models', make sure you don't have a local directory with the same name. "
+                f"Otherwise, make sure '{pretrained_model_name_or_path}' is the correct path to a directory "
+                f"containing a file named {weights_name}"
+            )

src/diffusers/models/attention.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import math
+import warnings
 from dataclasses import dataclass
 from typing import Optional
 
@@ -98,8 +99,11 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
         num_vector_embeds: Optional[int] = None,
         activation_fn: str = "geglu",
         num_embeds_ada_norm: Optional[int] = None,
+        use_linear_projection: bool = False,
+        only_cross_attention: bool = False,
     ):
         super().__init__()
+        self.use_linear_projection = use_linear_projection
         self.num_attention_heads = num_attention_heads
         self.attention_head_dim = attention_head_dim
         inner_dim = num_attention_heads * attention_head_dim
@@ -125,7 +129,10 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
             self.in_channels = in_channels
 
             self.norm = torch.nn.GroupNorm(num_groups=norm_num_groups, num_channels=in_channels, eps=1e-6, affine=True)
-            self.proj_in = nn.Conv2d(in_channels, inner_dim, kernel_size=1, stride=1, padding=0)
+            if use_linear_projection:
+                self.proj_in = nn.Linear(in_channels, inner_dim)
+            else:
+                self.proj_in = nn.Conv2d(in_channels, inner_dim, kernel_size=1, stride=1, padding=0)
         elif self.is_input_vectorized:
             assert sample_size is not None, "Transformer2DModel over discrete input must provide sample_size"
             assert num_vector_embeds is not None, "Transformer2DModel over discrete input must provide num_embed"
@@ -151,6 +158,7 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
                     activation_fn=activation_fn,
                     num_embeds_ada_norm=num_embeds_ada_norm,
                     attention_bias=attention_bias,
+                    only_cross_attention=only_cross_attention,
                 )
                 for d in range(num_layers)
             ]
@@ -158,7 +166,10 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
 
         # 4. Define output layers
         if self.is_input_continuous:
-            self.proj_out = nn.Conv2d(inner_dim, in_channels, kernel_size=1, stride=1, padding=0)
+            if use_linear_projection:
+                self.proj_out = nn.Linear(in_channels, inner_dim)
+            else:
+                self.proj_out = nn.Conv2d(inner_dim, in_channels, kernel_size=1, stride=1, padding=0)
         elif self.is_input_vectorized:
             self.norm_out = nn.LayerNorm(inner_dim)
             self.out = nn.Linear(inner_dim, self.num_vector_embeds - 1)
@@ -190,10 +201,16 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
         if self.is_input_continuous:
             batch, channel, height, weight = hidden_states.shape
             residual = hidden_states
+
             hidden_states = self.norm(hidden_states)
-            hidden_states = self.proj_in(hidden_states)
-            inner_dim = hidden_states.shape[1]
-            hidden_states = hidden_states.permute(0, 2, 3, 1).reshape(batch, height * weight, inner_dim)
+            if not self.use_linear_projection:
+                hidden_states = self.proj_in(hidden_states)
+                inner_dim = hidden_states.shape[1]
+                hidden_states = hidden_states.permute(0, 2, 3, 1).reshape(batch, height * weight, inner_dim)
+            else:
+                inner_dim = hidden_states.shape[1]
+                hidden_states = hidden_states.permute(0, 2, 3, 1).reshape(batch, height * weight, inner_dim)
+                hidden_states = self.proj_in(hidden_states)
         elif self.is_input_vectorized:
             hidden_states = self.latent_image_embedding(hidden_states)
 
@@ -203,8 +220,17 @@ class Transformer2DModel(ModelMixin, ConfigMixin):
 
         # 3. Output
         if self.is_input_continuous:
-            hidden_states = hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2)
-            hidden_states = self.proj_out(hidden_states)
+            if not self.use_linear_projection:
+                hidden_states = (
+                    hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2).contiguous()
+                )
+                hidden_states = self.proj_out(hidden_states)
+            else:
+                hidden_states = self.proj_out(hidden_states)
+                hidden_states = (
+                    hidden_states.reshape(batch, height, weight, inner_dim).permute(0, 3, 1, 2).contiguous()
+                )
+
             output = hidden_states + residual
         elif self.is_input_vectorized:
             hidden_states = self.norm_out(hidden_states)
@@ -284,22 +310,52 @@ class AttentionBlock(nn.Module):
         key_proj = self.key(hidden_states)
         value_proj = self.value(hidden_states)
 
-        # transpose
-        query_states = self.transpose_for_scores(query_proj)
-        key_states = self.transpose_for_scores(key_proj)
-        value_states = self.transpose_for_scores(value_proj)
+        scale = 1 / math.sqrt(self.channels / self.num_heads)
 
         # get scores
-        scale = 1 / math.sqrt(math.sqrt(self.channels / self.num_heads))
-        attention_scores = torch.matmul(query_states * scale, key_states.transpose(-1, -2) * scale)  # TODO: use baddmm
+        if self.num_heads > 1:
+            query_states = self.transpose_for_scores(query_proj)
+            key_states = self.transpose_for_scores(key_proj)
+            value_states = self.transpose_for_scores(value_proj)
+
+            # TODO: is there a way to perform batched matmul (e.g. baddbmm) on 4D tensors?
+            #       or reformulate this into a 3D problem?
+            # TODO: measure whether on MPS device it would be faster to do this matmul via einsum
+            #       as some matmuls can be 1.94x slower than an equivalent einsum on MPS
+            #       https://gist.github.com/Birch-san/cba16789ec27bb20996a4b4831b13ce0
+            attention_scores = torch.matmul(query_states, key_states.transpose(-1, -2)) * scale
+        else:
+            query_states, key_states, value_states = query_proj, key_proj, value_proj
+
+            attention_scores = torch.baddbmm(
+                torch.empty(
+                    query_states.shape[0],
+                    query_states.shape[1],
+                    key_states.shape[1],
+                    dtype=query_states.dtype,
+                    device=query_states.device,
+                ),
+                query_states,
+                key_states.transpose(-1, -2),
+                beta=0,
+                alpha=scale,
+            )
+
         attention_probs = torch.softmax(attention_scores.float(), dim=-1).type(attention_scores.dtype)
 
         # compute attention output
-        hidden_states = torch.matmul(attention_probs, value_states)
-
-        hidden_states = hidden_states.permute(0, 2, 1, 3).contiguous()
-        new_hidden_states_shape = hidden_states.size()[:-2] + (self.channels,)
-        hidden_states = hidden_states.view(new_hidden_states_shape)
+        if self.num_heads > 1:
+            # TODO: is there a way to perform batched matmul (e.g. bmm) on 4D tensors?
+            #       or reformulate this into a 3D problem?
+            # TODO: measure whether on MPS device it would be faster to do this matmul via einsum
+            #       as some matmuls can be 1.94x slower than an equivalent einsum on MPS
+            #       https://gist.github.com/Birch-san/cba16789ec27bb20996a4b4831b13ce0
+            hidden_states = torch.matmul(attention_probs, value_states)
+            hidden_states = hidden_states.permute(0, 2, 1, 3).contiguous()
+            new_hidden_states_shape = hidden_states.size()[:-2] + (self.channels,)
+            hidden_states = hidden_states.view(new_hidden_states_shape)
+        else:
+            hidden_states = torch.bmm(attention_probs, value_states)
 
         # compute next hidden_states
         hidden_states = self.proj_attn(hidden_states)
@@ -337,14 +393,17 @@ class BasicTransformerBlock(nn.Module):
         activation_fn: str = "geglu",
         num_embeds_ada_norm: Optional[int] = None,
         attention_bias: bool = False,
+        only_cross_attention: bool = False,
     ):
         super().__init__()
+        self.only_cross_attention = only_cross_attention
         self.attn1 = CrossAttention(
             query_dim=dim,
             heads=num_attention_heads,
             dim_head=attention_head_dim,
             dropout=dropout,
             bias=attention_bias,
+            cross_attention_dim=cross_attention_dim if only_cross_attention else None,
         )  # is a self-attention
         self.ff = FeedForward(dim, dropout=dropout, activation_fn=activation_fn)
         self.attn2 = CrossAttention(
@@ -366,6 +425,16 @@ class BasicTransformerBlock(nn.Module):
             self.norm2 = nn.LayerNorm(dim)
         self.norm3 = nn.LayerNorm(dim)
 
+        # if xformers is installed try to use memory_efficient_attention by default
+        if is_xformers_available():
+            try:
+                self._set_use_memory_efficient_attention_xformers(True)
+            except Exception as e:
+                warnings.warn(
+                    "Could not enable memory efficient attention. Make sure xformers is installed"
+                    f" correctly and a GPU is available: {e}"
+                )
+
     def _set_attention_slice(self, slice_size):
         self.attn1._slice_size = slice_size
         self.attn2._slice_size = slice_size
@@ -401,7 +470,11 @@ class BasicTransformerBlock(nn.Module):
         norm_hidden_states = (
             self.norm1(hidden_states, timestep) if self.use_ada_layer_norm else self.norm1(hidden_states)
         )
-        hidden_states = self.attn1(norm_hidden_states) + hidden_states
+
+        if self.only_cross_attention:
+            hidden_states = self.attn1(norm_hidden_states, context) + hidden_states
+        else:
+            hidden_states = self.attn1(norm_hidden_states) + hidden_states
 
         # 2. Cross-Attention
         norm_hidden_states = (
@@ -507,19 +580,17 @@ class CrossAttention(nn.Module):
         return hidden_states
 
     def _attention(self, query, key, value):
-        # TODO: use baddbmm for better performance
-        if query.device.type == "mps":
-            # Better performance on mps (~20-25%)
-            attention_scores = torch.einsum("b i d, b j d -> b i j", query, key) * self.scale
-        else:
-            attention_scores = torch.matmul(query, key.transpose(-1, -2)) * self.scale
+        attention_scores = torch.baddbmm(
+            torch.empty(query.shape[0], query.shape[1], key.shape[1], dtype=query.dtype, device=query.device),
+            query,
+            key.transpose(-1, -2),
+            beta=0,
+            alpha=self.scale,
+        )
         attention_probs = attention_scores.softmax(dim=-1)
         # compute attention output
 
-        if query.device.type == "mps":
-            hidden_states = torch.einsum("b i j, b j d -> b i d", attention_probs, value)
-        else:
-            hidden_states = torch.matmul(attention_probs, value)
+        hidden_states = torch.bmm(attention_probs, value)
 
         # reshape hidden_states
         hidden_states = self.reshape_batch_dim_to_heads(hidden_states)
@@ -534,21 +605,15 @@ class CrossAttention(nn.Module):
         for i in range(hidden_states.shape[0] // slice_size):
             start_idx = i * slice_size
             end_idx = (i + 1) * slice_size
-            if query.device.type == "mps":
-                # Better performance on mps (~20-25%)
-                attn_slice = (
-                    torch.einsum("b i d, b j d -> b i j", query[start_idx:end_idx], key[start_idx:end_idx])
-                    * self.scale
-                )
-            else:
-                attn_slice = (
-                    torch.matmul(query[start_idx:end_idx], key[start_idx:end_idx].transpose(1, 2)) * self.scale
-                )  # TODO: use baddbmm for better performance
+            attn_slice = torch.baddbmm(
+                torch.empty(slice_size, query.shape[1], key.shape[1], dtype=query.dtype, device=query.device),
+                query[start_idx:end_idx],
+                key[start_idx:end_idx].transpose(-1, -2),
+                beta=0,
+                alpha=self.scale,
+            )
             attn_slice = attn_slice.softmax(dim=-1)
-            if query.device.type == "mps":
-                attn_slice = torch.einsum("b i j, b j d -> b i d", attn_slice, value[start_idx:end_idx])
-            else:
-                attn_slice = torch.matmul(attn_slice, value[start_idx:end_idx])
+            attn_slice = torch.bmm(attn_slice, value[start_idx:end_idx])
 
             hidden_states[start_idx:end_idx] = attn_slice
 
@@ -666,3 +731,129 @@ class AdaLayerNorm(nn.Module):
         scale, shift = torch.chunk(emb, 2)
         x = self.norm(x) * (1 + scale) + shift
         return x
+
+
+class DualTransformer2DModel(nn.Module):
+    """
+    Dual transformer wrapper that combines two `Transformer2DModel`s for mixed inference.
+
+    Parameters:
+        num_attention_heads (`int`, *optional*, defaults to 16): The number of heads to use for multi-head attention.
+        attention_head_dim (`int`, *optional*, defaults to 88): The number of channels in each head.
+        in_channels (`int`, *optional*):
+            Pass if the input is continuous. The number of channels in the input and output.
+        num_layers (`int`, *optional*, defaults to 1): The number of layers of Transformer blocks to use.
+        dropout (`float`, *optional*, defaults to 0.1): The dropout probability to use.
+        cross_attention_dim (`int`, *optional*): The number of context dimensions to use.
+        sample_size (`int`, *optional*): Pass if the input is discrete. The width of the latent images.
+            Note that this is fixed at training time as it is used for learning a number of position embeddings. See
+            `ImagePositionalEmbeddings`.
+        num_vector_embeds (`int`, *optional*):
+            Pass if the input is discrete. The number of classes of the vector embeddings of the latent pixels.
+            Includes the class for the masked latent pixel.
+        activation_fn (`str`, *optional*, defaults to `"geglu"`): Activation function to be used in feed-forward.
+        num_embeds_ada_norm ( `int`, *optional*): Pass if at least one of the norm_layers is `AdaLayerNorm`.
+            The number of diffusion steps used during training. Note that this is fixed at training time as it is used
+            to learn a number of embeddings that are added to the hidden states. During inference, you can denoise for
+            up to but not more than steps than `num_embeds_ada_norm`.
+        attention_bias (`bool`, *optional*):
+            Configure if the TransformerBlocks' attention should contain a bias parameter.
+    """
+
+    def __init__(
+        self,
+        num_attention_heads: int = 16,
+        attention_head_dim: int = 88,
+        in_channels: Optional[int] = None,
+        num_layers: int = 1,
+        dropout: float = 0.0,
+        norm_num_groups: int = 32,
+        cross_attention_dim: Optional[int] = None,
+        attention_bias: bool = False,
+        sample_size: Optional[int] = None,
+        num_vector_embeds: Optional[int] = None,
+        activation_fn: str = "geglu",
+        num_embeds_ada_norm: Optional[int] = None,
+    ):
+        super().__init__()
+        self.transformers = nn.ModuleList(
+            [
+                Transformer2DModel(
+                    num_attention_heads=num_attention_heads,
+                    attention_head_dim=attention_head_dim,
+                    in_channels=in_channels,
+                    num_layers=num_layers,
+                    dropout=dropout,
+                    norm_num_groups=norm_num_groups,
+                    cross_attention_dim=cross_attention_dim,
+                    attention_bias=attention_bias,
+                    sample_size=sample_size,
+                    num_vector_embeds=num_vector_embeds,
+                    activation_fn=activation_fn,
+                    num_embeds_ada_norm=num_embeds_ada_norm,
+                )
+                for _ in range(2)
+            ]
+        )
+
+        # Variables that can be set by a pipeline:
+
+        # The ratio of transformer1 to transformer2's output states to be combined during inference
+        self.mix_ratio = 0.5
+
+        # The shape of `encoder_hidden_states` is expected to be
+        # `(batch_size, condition_lengths[0]+condition_lengths[1], num_features)`
+        self.condition_lengths = [77, 257]
+
+        # Which transformer to use to encode which condition.
+        # E.g. `(1, 0)` means that we'll use `transformers[1](conditions[0])` and `transformers[0](conditions[1])`
+        self.transformer_index_for_condition = [1, 0]
+
+    def forward(self, hidden_states, encoder_hidden_states, timestep=None, return_dict: bool = True):
+        """
+        Args:
+            hidden_states ( When discrete, `torch.LongTensor` of shape `(batch size, num latent pixels)`.
+                When continuous, `torch.FloatTensor` of shape `(batch size, channel, height, width)`): Input
+                hidden_states
+            encoder_hidden_states ( `torch.LongTensor` of shape `(batch size, context dim)`, *optional*):
+                Conditional embeddings for cross attention layer. If not given, cross-attention defaults to
+                self-attention.
+            timestep ( `torch.long`, *optional*):
+                Optional timestep to be applied as an embedding in AdaLayerNorm's. Used to indicate denoising step.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`models.unet_2d_condition.UNet2DConditionOutput`] instead of a plain tuple.
+
+        Returns:
+            [`~models.attention.Transformer2DModelOutput`] or `tuple`: [`~models.attention.Transformer2DModelOutput`]
+            if `return_dict` is True, otherwise a `tuple`. When returning a tuple, the first element is the sample
+            tensor.
+        """
+        input_states = hidden_states
+
+        encoded_states = []
+        tokens_start = 0
+        for i in range(2):
+            # for each of the two transformers, pass the corresponding condition tokens
+            condition_state = encoder_hidden_states[:, tokens_start : tokens_start + self.condition_lengths[i]]
+            transformer_index = self.transformer_index_for_condition[i]
+            encoded_state = self.transformers[transformer_index](input_states, condition_state, timestep, return_dict)[
+                0
+            ]
+            encoded_states.append(encoded_state - input_states)
+            tokens_start += self.condition_lengths[i]
+
+        output_states = encoded_states[0] * self.mix_ratio + encoded_states[1] * (1 - self.mix_ratio)
+        output_states = output_states + input_states
+
+        if not return_dict:
+            return (output_states,)
+
+        return Transformer2DModelOutput(sample=output_states)
+
+    def _set_attention_slice(self, slice_size):
+        for transformer in self.transformers:
+            transformer._set_attention_slice(slice_size)
+
+    def _set_use_memory_efficient_attention_xformers(self, use_memory_efficient_attention_xformers: bool):
+        for transformer in self.transformers:
+            transformer._set_use_memory_efficient_attention_xformers(use_memory_efficient_attention_xformers)

src/diffusers/models/attention_flax.py

@@ -104,6 +104,8 @@ class FlaxBasicTransformerBlock(nn.Module):
             Hidden states dimension inside each head
         dropout (:obj:`float`, *optional*, defaults to 0.0):
             Dropout rate
+        only_cross_attention (`bool`, defaults to `False`):
+            Whether to only apply cross attention.
         dtype (:obj:`jnp.dtype`, *optional*, defaults to jnp.float32):
             Parameters `dtype`
     """
@@ -111,10 +113,11 @@ class FlaxBasicTransformerBlock(nn.Module):
     n_heads: int
     d_head: int
     dropout: float = 0.0
+    only_cross_attention: bool = False
     dtype: jnp.dtype = jnp.float32
 
     def setup(self):
-        # self attention
+        # self attention (or cross_attention if only_cross_attention is True)
         self.attn1 = FlaxAttentionBlock(self.dim, self.n_heads, self.d_head, self.dropout, dtype=self.dtype)
         # cross attention
         self.attn2 = FlaxAttentionBlock(self.dim, self.n_heads, self.d_head, self.dropout, dtype=self.dtype)
@@ -126,7 +129,10 @@ class FlaxBasicTransformerBlock(nn.Module):
     def __call__(self, hidden_states, context, deterministic=True):
         # self attention
         residual = hidden_states
-        hidden_states = self.attn1(self.norm1(hidden_states), deterministic=deterministic)
+        if self.only_cross_attention:
+            hidden_states = self.attn1(self.norm1(hidden_states), context, deterministic=deterministic)
+        else:
+            hidden_states = self.attn1(self.norm1(hidden_states), deterministic=deterministic)
         hidden_states = hidden_states + residual
 
         # cross attention
@@ -159,6 +165,8 @@ class FlaxTransformer2DModel(nn.Module):
             Number of transformers block
         dropout (:obj:`float`, *optional*, defaults to 0.0):
             Dropout rate
+        use_linear_projection (`bool`, defaults to `False`): tbd
+        only_cross_attention (`bool`, defaults to `False`): tbd
         dtype (:obj:`jnp.dtype`, *optional*, defaults to jnp.float32):
             Parameters `dtype`
     """
@@ -167,49 +175,70 @@ class FlaxTransformer2DModel(nn.Module):
     d_head: int
     depth: int = 1
     dropout: float = 0.0
+    use_linear_projection: bool = False
+    only_cross_attention: bool = False
     dtype: jnp.dtype = jnp.float32
 
     def setup(self):
         self.norm = nn.GroupNorm(num_groups=32, epsilon=1e-5)
 
         inner_dim = self.n_heads * self.d_head
-        self.proj_in = nn.Conv(
-            inner_dim,
-            kernel_size=(1, 1),
-            strides=(1, 1),
-            padding="VALID",
-            dtype=self.dtype,
-        )
+        if self.use_linear_projection:
+            self.proj_in = nn.Dense(inner_dim, dtype=self.dtype)
+        else:
+            self.proj_in = nn.Conv(
+                inner_dim,
+                kernel_size=(1, 1),
+                strides=(1, 1),
+                padding="VALID",
+                dtype=self.dtype,
+            )
 
         self.transformer_blocks = [
-            FlaxBasicTransformerBlock(inner_dim, self.n_heads, self.d_head, dropout=self.dropout, dtype=self.dtype)
+            FlaxBasicTransformerBlock(
+                inner_dim,
+                self.n_heads,
+                self.d_head,
+                dropout=self.dropout,
+                only_cross_attention=self.only_cross_attention,
+                dtype=self.dtype,
+            )
             for _ in range(self.depth)
         ]
 
-        self.proj_out = nn.Conv(
-            inner_dim,
-            kernel_size=(1, 1),
-            strides=(1, 1),
-            padding="VALID",
-            dtype=self.dtype,
-        )
+        if self.use_linear_projection:
+            self.proj_out = nn.Dense(inner_dim, dtype=self.dtype)
+        else:
+            self.proj_out = nn.Conv(
+                inner_dim,
+                kernel_size=(1, 1),
+                strides=(1, 1),
+                padding="VALID",
+                dtype=self.dtype,
+            )
 
     def __call__(self, hidden_states, context, deterministic=True):
         batch, height, width, channels = hidden_states.shape
         residual = hidden_states
         hidden_states = self.norm(hidden_states)
-        hidden_states = self.proj_in(hidden_states)
-
-        hidden_states = hidden_states.reshape(batch, height * width, channels)
+        if self.use_linear_projection:
+            hidden_states = hidden_states.reshape(batch, height * width, channels)
+            hidden_states = self.proj_in(hidden_states)
+        else:
+            hidden_states = self.proj_in(hidden_states)
+            hidden_states = hidden_states.reshape(batch, height * width, channels)
 
         for transformer_block in self.transformer_blocks:
             hidden_states = transformer_block(hidden_states, context, deterministic=deterministic)
 
-        hidden_states = hidden_states.reshape(batch, height, width, channels)
+        if self.use_linear_projection:
+            hidden_states = self.proj_out(hidden_states)
+            hidden_states = hidden_states.reshape(batch, height, width, channels)
+        else:
+            hidden_states = hidden_states.reshape(batch, height, width, channels)
+            hidden_states = self.proj_out(hidden_states)
 
-        hidden_states = self.proj_out(hidden_states)
         hidden_states = hidden_states + residual
-
         return hidden_states
 
 

src/diffusers/models/resnet.py

@@ -419,8 +419,6 @@ class ResnetBlock2D(nn.Module):
             self.nonlinearity = Mish()
         elif non_linearity == "silu":
             self.nonlinearity = nn.SiLU()
-        elif non_linearity == "gelu":
-            self.nonlinearity = nn.GELU()
 
         self.upsample = self.downsample = None
         if self.up:

src/diffusers/models/unet_2d.py

@@ -43,8 +43,8 @@ class UNet2DModel(ModelMixin, ConfigMixin):
     implements for all the model (such as downloading or saving, etc.)
 
     Parameters:
-        sample_size (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`, *optional*):
-            Input sample size.
+        sample_size (`int` or `Tuple[int, int]`, *optional*, defaults to `None`):
+            Height and width of input/output sample.
         in_channels (`int`, *optional*, defaults to 3): Number of channels in the input image.
         out_channels (`int`, *optional*, defaults to 3): Number of channels in the output.
         center_input_sample (`bool`, *optional*, defaults to `False`): Whether to center the input sample.
@@ -71,7 +71,7 @@ class UNet2DModel(ModelMixin, ConfigMixin):
     @register_to_config
     def __init__(
         self,
-        sample_size: Optional[int] = None,
+        sample_size: Optional[Union[int, Tuple[int, int]]] = None,
         in_channels: int = 3,
         out_channels: int = 3,
         center_input_sample: bool = False,
@@ -175,7 +175,7 @@ class UNet2DModel(ModelMixin, ConfigMixin):
         num_groups_out = norm_num_groups if norm_num_groups is not None else min(block_out_channels[0] // 4, 32)
         self.conv_norm_out = nn.GroupNorm(num_channels=block_out_channels[0], num_groups=num_groups_out, eps=norm_eps)
         self.conv_act = nn.SiLU()
-        self.conv_out = nn.Conv2d(block_out_channels[0], out_channels, 3, padding=1)
+        self.conv_out = nn.Conv2d(block_out_channels[0], out_channels, kernel_size=3, padding=1)
 
     def forward(
         self,
@@ -209,6 +209,11 @@ class UNet2DModel(ModelMixin, ConfigMixin):
         timesteps = timesteps * torch.ones(sample.shape[0], dtype=timesteps.dtype, device=timesteps.device)
 
         t_emb = self.time_proj(timesteps)
+
+        # timesteps does not contain any weights and will always return f32 tensors
+        # but time_embedding might actually be running in fp16. so we need to cast here.
+        # there might be better ways to encapsulate this.
+        t_emb = t_emb.to(dtype=self.dtype)
         emb = self.time_embedding(t_emb)
 
         # 2. pre-process
@@ -242,9 +247,7 @@ class UNet2DModel(ModelMixin, ConfigMixin):
                 sample = upsample_block(sample, res_samples, emb)
 
         # 6. post-process
-        # make sure hidden states is in float32
-        # when running in half-precision
-        sample = self.conv_norm_out(sample.float()).type(sample.dtype)
+        sample = self.conv_norm_out(sample)
         sample = self.conv_act(sample)
         sample = self.conv_out(sample)
 

src/diffusers/models/unet_2d_blocks.py

@@ -15,7 +15,7 @@ import numpy as np
 import torch
 from torch import nn
 
-from .attention import AttentionBlock, Transformer2DModel
+from .attention import AttentionBlock, DualTransformer2DModel, Transformer2DModel
 from .resnet import Downsample2D, FirDownsample2D, FirUpsample2D, ResnetBlock2D, Upsample2D
 
 
@@ -32,6 +32,9 @@ def get_down_block(
     resnet_groups=None,
     cross_attention_dim=None,
     downsample_padding=None,
+    dual_cross_attention=False,
+    use_linear_projection=False,
+    only_cross_attention=False,
 ):
     down_block_type = down_block_type[7:] if down_block_type.startswith("UNetRes") else down_block_type
     if down_block_type == "DownBlock2D":
@@ -74,6 +77,9 @@ def get_down_block(
             downsample_padding=downsample_padding,
             cross_attention_dim=cross_attention_dim,
             attn_num_head_channels=attn_num_head_channels,
+            dual_cross_attention=dual_cross_attention,
+            use_linear_projection=use_linear_projection,
+            only_cross_attention=only_cross_attention,
         )
     elif down_block_type == "SkipDownBlock2D":
         return SkipDownBlock2D(
@@ -137,6 +143,9 @@ def get_up_block(
     attn_num_head_channels,
     resnet_groups=None,
     cross_attention_dim=None,
+    dual_cross_attention=False,
+    use_linear_projection=False,
+    only_cross_attention=False,
 ):
     up_block_type = up_block_type[7:] if up_block_type.startswith("UNetRes") else up_block_type
     if up_block_type == "UpBlock2D":
@@ -166,6 +175,9 @@ def get_up_block(
             resnet_groups=resnet_groups,
             cross_attention_dim=cross_attention_dim,
             attn_num_head_channels=attn_num_head_channels,
+            dual_cross_attention=dual_cross_attention,
+            use_linear_projection=use_linear_projection,
+            only_cross_attention=only_cross_attention,
         )
     elif up_block_type == "AttnUpBlock2D":
         return AttnUpBlock2D(
@@ -242,7 +254,6 @@ class UNetMidBlock2D(nn.Module):
         attn_num_head_channels=1,
         attention_type="default",
         output_scale_factor=1.0,
-        **kwargs,
     ):
         super().__init__()
 
@@ -322,7 +333,8 @@ class UNetMidBlock2DCrossAttn(nn.Module):
         attention_type="default",
         output_scale_factor=1.0,
         cross_attention_dim=1280,
-        **kwargs,
+        dual_cross_attention=False,
+        use_linear_projection=False,
     ):
         super().__init__()
 
@@ -348,16 +360,29 @@ class UNetMidBlock2DCrossAttn(nn.Module):
         attentions = []
 
         for _ in range(num_layers):
-            attentions.append(
-                Transformer2DModel(
-                    attn_num_head_channels,
-                    in_channels // attn_num_head_channels,
-                    in_channels=in_channels,
-                    num_layers=1,
-                    cross_attention_dim=cross_attention_dim,
-                    norm_num_groups=resnet_groups,
+            if not dual_cross_attention:
+                attentions.append(
+                    Transformer2DModel(
+                        attn_num_head_channels,
+                        in_channels // attn_num_head_channels,
+                        in_channels=in_channels,
+                        num_layers=1,
+                        cross_attention_dim=cross_attention_dim,
+                        norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
+                    )
+                )
+            else:
+                attentions.append(
+                    DualTransformer2DModel(
+                        attn_num_head_channels,
+                        in_channels // attn_num_head_channels,
+                        in_channels=in_channels,
+                        num_layers=1,
+                        cross_attention_dim=cross_attention_dim,
+                        norm_num_groups=resnet_groups,
+                    )
                 )
-            )
             resnets.append(
                 ResnetBlock2D(
                     in_channels=in_channels,
@@ -377,15 +402,17 @@ class UNetMidBlock2DCrossAttn(nn.Module):
         self.resnets = nn.ModuleList(resnets)
 
     def set_attention_slice(self, slice_size):
-        if slice_size is not None and self.attn_num_head_channels % slice_size != 0:
+        head_dims = self.attn_num_head_channels
+        head_dims = [head_dims] if isinstance(head_dims, int) else head_dims
+        if slice_size is not None and any(dim % slice_size != 0 for dim in head_dims):
             raise ValueError(
-                f"Make sure slice_size {slice_size} is a divisor of "
-                f"the number of heads used in cross_attention {self.attn_num_head_channels}"
+                f"Make sure slice_size {slice_size} is a common divisor of "
+                f"the number of heads used in cross_attention: {head_dims}"
             )
-        if slice_size is not None and slice_size > self.attn_num_head_channels:
+        if slice_size is not None and slice_size > min(head_dims):
             raise ValueError(
-                f"Chunk_size {slice_size} has to be smaller or equal to "
-                f"the number of heads used in cross_attention {self.attn_num_head_channels}"
+                f"slice_size {slice_size} has to be smaller or equal to "
+                f"the lowest number of heads used in cross_attention: min({head_dims}) = {min(head_dims)}"
             )
 
         for attn in self.attentions:
@@ -505,6 +532,9 @@ class CrossAttnDownBlock2D(nn.Module):
         output_scale_factor=1.0,
         downsample_padding=1,
         add_downsample=True,
+        dual_cross_attention=False,
+        use_linear_projection=False,
+        only_cross_attention=False,
     ):
         super().__init__()
         resnets = []
@@ -529,16 +559,30 @@ class CrossAttnDownBlock2D(nn.Module):
                     pre_norm=resnet_pre_norm,
                 )
             )
-            attentions.append(
-                Transformer2DModel(
-                    attn_num_head_channels,
-                    out_channels // attn_num_head_channels,
-                    in_channels=out_channels,
-                    num_layers=1,
-                    cross_attention_dim=cross_attention_dim,
-                    norm_num_groups=resnet_groups,
+            if not dual_cross_attention:
+                attentions.append(
+                    Transformer2DModel(
+                        attn_num_head_channels,
+                        out_channels // attn_num_head_channels,
+                        in_channels=out_channels,
+                        num_layers=1,
+                        cross_attention_dim=cross_attention_dim,
+                        norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
+                        only_cross_attention=only_cross_attention,
+                    )
+                )
+            else:
+                attentions.append(
+                    DualTransformer2DModel(
+                        attn_num_head_channels,
+                        out_channels // attn_num_head_channels,
+                        in_channels=out_channels,
+                        num_layers=1,
+                        cross_attention_dim=cross_attention_dim,
+                        norm_num_groups=resnet_groups,
+                    )
                 )
-            )
         self.attentions = nn.ModuleList(attentions)
         self.resnets = nn.ModuleList(resnets)
 
@@ -556,15 +600,17 @@ class CrossAttnDownBlock2D(nn.Module):
         self.gradient_checkpointing = False
 
     def set_attention_slice(self, slice_size):
-        if slice_size is not None and self.attn_num_head_channels % slice_size != 0:
+        head_dims = self.attn_num_head_channels
+        head_dims = [head_dims] if isinstance(head_dims, int) else head_dims
+        if slice_size is not None and any(dim % slice_size != 0 for dim in head_dims):
             raise ValueError(
-                f"Make sure slice_size {slice_size} is a divisor of "
-                f"the number of heads used in cross_attention {self.attn_num_head_channels}"
+                f"Make sure slice_size {slice_size} is a common divisor of "
+                f"the number of heads used in cross_attention: {head_dims}"
             )
-        if slice_size is not None and slice_size > self.attn_num_head_channels:
+        if slice_size is not None and slice_size > min(head_dims):
             raise ValueError(
-                f"Chunk_size {slice_size} has to be smaller or equal to "
-                f"the number of heads used in cross_attention {self.attn_num_head_channels}"
+                f"slice_size {slice_size} has to be smaller or equal to "
+                f"the lowest number of heads used in cross_attention: min({head_dims}) = {min(head_dims)}"
             )
 
         for attn in self.attentions:
@@ -1089,6 +1135,9 @@ class CrossAttnUpBlock2D(nn.Module):
         attention_type="default",
         output_scale_factor=1.0,
         add_upsample=True,
+        dual_cross_attention=False,
+        use_linear_projection=False,
+        only_cross_attention=False,
     ):
         super().__init__()
         resnets = []
@@ -1115,16 +1164,30 @@ class CrossAttnUpBlock2D(nn.Module):
                     pre_norm=resnet_pre_norm,
                 )
             )
-            attentions.append(
-                Transformer2DModel(
-                    attn_num_head_channels,
-                    out_channels // attn_num_head_channels,
-                    in_channels=out_channels,
-                    num_layers=1,
-                    cross_attention_dim=cross_attention_dim,
-                    norm_num_groups=resnet_groups,
+            if not dual_cross_attention:
+                attentions.append(
+                    Transformer2DModel(
+                        attn_num_head_channels,
+                        out_channels // attn_num_head_channels,
+                        in_channels=out_channels,
+                        num_layers=1,
+                        cross_attention_dim=cross_attention_dim,
+                        norm_num_groups=resnet_groups,
+                        use_linear_projection=use_linear_projection,
+                        only_cross_attention=only_cross_attention,
+                    )
+                )
+            else:
+                attentions.append(
+                    DualTransformer2DModel(
+                        attn_num_head_channels,
+                        out_channels // attn_num_head_channels,
+                        in_channels=out_channels,
+                        num_layers=1,
+                        cross_attention_dim=cross_attention_dim,
+                        norm_num_groups=resnet_groups,
+                    )
                 )
-            )
         self.attentions = nn.ModuleList(attentions)
         self.resnets = nn.ModuleList(resnets)
 
@@ -1136,15 +1199,17 @@ class CrossAttnUpBlock2D(nn.Module):
         self.gradient_checkpointing = False
 
     def set_attention_slice(self, slice_size):
-        if slice_size is not None and self.attn_num_head_channels % slice_size != 0:
+        head_dims = self.attn_num_head_channels
+        head_dims = [head_dims] if isinstance(head_dims, int) else head_dims
+        if slice_size is not None and any(dim % slice_size != 0 for dim in head_dims):
             raise ValueError(
-                f"Make sure slice_size {slice_size} is a divisor of "
-                f"the number of heads used in cross_attention {self.attn_num_head_channels}"
+                f"Make sure slice_size {slice_size} is a common divisor of "
+                f"the number of heads used in cross_attention: {head_dims}"
             )
-        if slice_size is not None and slice_size > self.attn_num_head_channels:
+        if slice_size is not None and slice_size > min(head_dims):
             raise ValueError(
-                f"Chunk_size {slice_size} has to be smaller or equal to "
-                f"the number of heads used in cross_attention {self.attn_num_head_channels}"
+                f"slice_size {slice_size} has to be smaller or equal to "
+                f"the lowest number of heads used in cross_attention: min({head_dims}) = {min(head_dims)}"
             )
 
         for attn in self.attentions:

src/diffusers/models/unet_2d_blocks_flax.py

@@ -46,6 +46,8 @@ class FlaxCrossAttnDownBlock2D(nn.Module):
     num_layers: int = 1
     attn_num_head_channels: int = 1
     add_downsample: bool = True
+    use_linear_projection: bool = False
+    only_cross_attention: bool = False
     dtype: jnp.dtype = jnp.float32
 
     def setup(self):
@@ -68,6 +70,8 @@ class FlaxCrossAttnDownBlock2D(nn.Module):
                 n_heads=self.attn_num_head_channels,
                 d_head=self.out_channels // self.attn_num_head_channels,
                 depth=1,
+                use_linear_projection=self.use_linear_projection,
+                only_cross_attention=self.only_cross_attention,
                 dtype=self.dtype,
             )
             attentions.append(attn_block)
@@ -178,6 +182,8 @@ class FlaxCrossAttnUpBlock2D(nn.Module):
     num_layers: int = 1
     attn_num_head_channels: int = 1
     add_upsample: bool = True
+    use_linear_projection: bool = False
+    only_cross_attention: bool = False
     dtype: jnp.dtype = jnp.float32
 
     def setup(self):
@@ -201,6 +207,8 @@ class FlaxCrossAttnUpBlock2D(nn.Module):
                 n_heads=self.attn_num_head_channels,
                 d_head=self.out_channels // self.attn_num_head_channels,
                 depth=1,
+                use_linear_projection=self.use_linear_projection,
+                only_cross_attention=self.only_cross_attention,
                 dtype=self.dtype,
             )
             attentions.append(attn_block)
@@ -310,6 +318,7 @@ class FlaxUNetMidBlock2DCrossAttn(nn.Module):
     dropout: float = 0.0
     num_layers: int = 1
     attn_num_head_channels: int = 1
+    use_linear_projection: bool = False
     dtype: jnp.dtype = jnp.float32
 
     def setup(self):
@@ -331,6 +340,7 @@ class FlaxUNetMidBlock2DCrossAttn(nn.Module):
                 n_heads=self.attn_num_head_channels,
                 d_head=self.in_channels // self.attn_num_head_channels,
                 depth=1,
+                use_linear_projection=self.use_linear_projection,
                 dtype=self.dtype,
             )
             attentions.append(attn_block)

src/diffusers/models/unet_2d_condition.py

@@ -56,11 +56,12 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
     implements for all the models (such as downloading or saving, etc.)
 
     Parameters:
-        sample_size (`int`, *optional*): The size of the input sample.
+        sample_size (`int` or `Tuple[int, int]`, *optional*, defaults to `None`):
+            Height and width of input/output sample.
         in_channels (`int`, *optional*, defaults to 4): The number of channels in the input sample.
         out_channels (`int`, *optional*, defaults to 4): The number of channels in the output.
         center_input_sample (`bool`, *optional*, defaults to `False`): Whether to center the input sample.
-        flip_sin_to_cos (`bool`, *optional*, defaults to `True`):
+        flip_sin_to_cos (`bool`, *optional*, defaults to `False`):
             Whether to flip the sin to cos in the time embedding.
         freq_shift (`int`, *optional*, defaults to 0): The frequency shift to apply to the time embedding.
         down_block_types (`Tuple[str]`, *optional*, defaults to `("CrossAttnDownBlock2D", "CrossAttnDownBlock2D", "CrossAttnDownBlock2D", "DownBlock2D")`):
@@ -97,6 +98,7 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
             "DownBlock2D",
         ),
         up_block_types: Tuple[str] = ("UpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D"),
+        only_cross_attention: Union[bool, Tuple[bool]] = False,
         block_out_channels: Tuple[int] = (320, 640, 1280, 1280),
         layers_per_block: int = 2,
         downsample_padding: int = 1,
@@ -105,7 +107,10 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         norm_num_groups: int = 32,
         norm_eps: float = 1e-5,
         cross_attention_dim: int = 1280,
-        attention_head_dim: int = 8,
+        attention_head_dim: Union[int, Tuple[int]] = 8,
+        dual_cross_attention: bool = False,
+        use_linear_projection: bool = False,
+        num_class_embeds: Optional[int] = None,
     ):
         super().__init__()
 
@@ -121,10 +126,20 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
 
         self.time_embedding = TimestepEmbedding(timestep_input_dim, time_embed_dim)
 
+        # class embedding
+        if num_class_embeds is not None:
+            self.class_embedding = nn.Embedding(num_class_embeds, time_embed_dim)
+
         self.down_blocks = nn.ModuleList([])
         self.mid_block = None
         self.up_blocks = nn.ModuleList([])
 
+        if isinstance(only_cross_attention, bool):
+            only_cross_attention = [only_cross_attention] * len(down_block_types)
+
+        if isinstance(attention_head_dim, int):
+            attention_head_dim = (attention_head_dim,) * len(down_block_types)
+
         # down
         output_channel = block_out_channels[0]
         for i, down_block_type in enumerate(down_block_types):
@@ -143,8 +158,11 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
                 resnet_act_fn=act_fn,
                 resnet_groups=norm_num_groups,
                 cross_attention_dim=cross_attention_dim,
-                attn_num_head_channels=attention_head_dim,
+                attn_num_head_channels=attention_head_dim[i],
                 downsample_padding=downsample_padding,
+                dual_cross_attention=dual_cross_attention,
+                use_linear_projection=use_linear_projection,
+                only_cross_attention=only_cross_attention[i],
             )
             self.down_blocks.append(down_block)
 
@@ -157,8 +175,10 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
             output_scale_factor=mid_block_scale_factor,
             resnet_time_scale_shift="default",
             cross_attention_dim=cross_attention_dim,
-            attn_num_head_channels=attention_head_dim,
+            attn_num_head_channels=attention_head_dim[-1],
             resnet_groups=norm_num_groups,
+            dual_cross_attention=dual_cross_attention,
+            use_linear_projection=use_linear_projection,
         )
 
         # count how many layers upsample the images
@@ -166,6 +186,8 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
 
         # up
         reversed_block_out_channels = list(reversed(block_out_channels))
+        reversed_attention_head_dim = list(reversed(attention_head_dim))
+        only_cross_attention = list(reversed(only_cross_attention))
         output_channel = reversed_block_out_channels[0]
         for i, up_block_type in enumerate(up_block_types):
             is_final_block = i == len(block_out_channels) - 1
@@ -193,7 +215,10 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
                 resnet_act_fn=act_fn,
                 resnet_groups=norm_num_groups,
                 cross_attention_dim=cross_attention_dim,
-                attn_num_head_channels=attention_head_dim,
+                attn_num_head_channels=reversed_attention_head_dim[i],
+                dual_cross_attention=dual_cross_attention,
+                use_linear_projection=use_linear_projection,
+                only_cross_attention=only_cross_attention[i],
             )
             self.up_blocks.append(up_block)
             prev_output_channel = output_channel
@@ -201,18 +226,20 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         # out
         self.conv_norm_out = nn.GroupNorm(num_channels=block_out_channels[0], num_groups=norm_num_groups, eps=norm_eps)
         self.conv_act = nn.SiLU()
-        self.conv_out = nn.Conv2d(block_out_channels[0], out_channels, 3, padding=1)
+        self.conv_out = nn.Conv2d(block_out_channels[0], out_channels, kernel_size=3, padding=1)
 
     def set_attention_slice(self, slice_size):
-        if slice_size is not None and self.config.attention_head_dim % slice_size != 0:
+        head_dims = self.config.attention_head_dim
+        head_dims = [head_dims] if isinstance(head_dims, int) else head_dims
+        if slice_size is not None and any(dim % slice_size != 0 for dim in head_dims):
             raise ValueError(
-                f"Make sure slice_size {slice_size} is a divisor of "
-                f"the number of heads used in cross_attention {self.config.attention_head_dim}"
+                f"Make sure slice_size {slice_size} is a common divisor of "
+                f"the number of heads used in cross_attention: {head_dims}"
             )
-        if slice_size is not None and slice_size > self.config.attention_head_dim:
+        if slice_size is not None and slice_size > min(head_dims):
             raise ValueError(
-                f"Chunk_size {slice_size} has to be smaller or equal to "
-                f"the number of heads used in cross_attention {self.config.attention_head_dim}"
+                f"slice_size {slice_size} has to be smaller or equal to "
+                f"the lowest number of heads used in cross_attention: min({head_dims}) = {min(head_dims)}"
             )
 
         for block in self.down_blocks:
@@ -245,14 +272,14 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         sample: torch.FloatTensor,
         timestep: Union[torch.Tensor, float, int],
         encoder_hidden_states: torch.Tensor,
+        class_labels: Optional[torch.Tensor] = None,
         return_dict: bool = True,
     ) -> Union[UNet2DConditionOutput, Tuple]:
         r"""
         Args:
             sample (`torch.FloatTensor`): (batch, channel, height, width) noisy inputs tensor
             timestep (`torch.FloatTensor` or `float` or `int`): (batch) timesteps
-            encoder_hidden_states (`torch.FloatTensor`):
-                (batch_size, sequence_length, hidden_size) encoder hidden states
+            encoder_hidden_states (`torch.FloatTensor`): (batch, channel, height, width) encoder hidden states
             return_dict (`bool`, *optional*, defaults to `True`):
                 Whether or not to return a [`models.unet_2d_condition.UNet2DConditionOutput`] instead of a plain tuple.
 
@@ -298,6 +325,12 @@ class UNet2DConditionModel(ModelMixin, ConfigMixin):
         t_emb = t_emb.to(dtype=self.dtype)
         emb = self.time_embedding(t_emb)
 
+        if self.config.num_class_embeds is not None:
+            if class_labels is None:
+                raise ValueError("class_labels should be provided when num_class_embeds > 0")
+            class_emb = self.class_embedding(class_labels).to(dtype=self.dtype)
+            emb = emb + class_emb
+
         # 2. pre-process
         sample = self.conv_in(sample)
 

src/diffusers/models/unet_2d_condition_flax.py

@@ -79,7 +79,7 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
             The tuple of output channels for each block.
         layers_per_block (`int`, *optional*, defaults to 2):
             The number of layers per block.
-        attention_head_dim (`int`, *optional*, defaults to 8):
+        attention_head_dim (`int` or `Tuple[int]`, *optional*, defaults to 8):
             The dimension of the attention heads.
         cross_attention_dim (`int`, *optional*, defaults to 768):
             The dimension of the cross attention features.
@@ -97,11 +97,13 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
         "DownBlock2D",
     )
     up_block_types: Tuple[str] = ("UpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D")
+    only_cross_attention: Union[bool, Tuple[bool]] = False
     block_out_channels: Tuple[int] = (320, 640, 1280, 1280)
     layers_per_block: int = 2
-    attention_head_dim: int = 8
+    attention_head_dim: Union[int, Tuple[int]] = 8
     cross_attention_dim: int = 1280
     dropout: float = 0.0
+    use_linear_projection: bool = False
     dtype: jnp.dtype = jnp.float32
     freq_shift: int = 0
 
@@ -134,6 +136,14 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
         self.time_proj = FlaxTimesteps(block_out_channels[0], freq_shift=self.config.freq_shift)
         self.time_embedding = FlaxTimestepEmbedding(time_embed_dim, dtype=self.dtype)
 
+        only_cross_attention = self.only_cross_attention
+        if isinstance(only_cross_attention, bool):
+            only_cross_attention = (only_cross_attention,) * len(self.down_block_types)
+
+        attention_head_dim = self.attention_head_dim
+        if isinstance(attention_head_dim, int):
+            attention_head_dim = (attention_head_dim,) * len(self.down_block_types)
+
         # down
         down_blocks = []
         output_channel = block_out_channels[0]
@@ -148,8 +158,10 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
                     out_channels=output_channel,
                     dropout=self.dropout,
                     num_layers=self.layers_per_block,
-                    attn_num_head_channels=self.attention_head_dim,
+                    attn_num_head_channels=attention_head_dim[i],
                     add_downsample=not is_final_block,
+                    use_linear_projection=self.use_linear_projection,
+                    only_cross_attention=only_cross_attention[i],
                     dtype=self.dtype,
                 )
             else:
@@ -169,13 +181,16 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
         self.mid_block = FlaxUNetMidBlock2DCrossAttn(
             in_channels=block_out_channels[-1],
             dropout=self.dropout,
-            attn_num_head_channels=self.attention_head_dim,
+            attn_num_head_channels=attention_head_dim[-1],
+            use_linear_projection=self.use_linear_projection,
             dtype=self.dtype,
         )
 
         # up
         up_blocks = []
         reversed_block_out_channels = list(reversed(block_out_channels))
+        reversed_attention_head_dim = list(reversed(attention_head_dim))
+        only_cross_attention = list(reversed(only_cross_attention))
         output_channel = reversed_block_out_channels[0]
         for i, up_block_type in enumerate(self.up_block_types):
             prev_output_channel = output_channel
@@ -190,9 +205,11 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
                     out_channels=output_channel,
                     prev_output_channel=prev_output_channel,
                     num_layers=self.layers_per_block + 1,
-                    attn_num_head_channels=self.attention_head_dim,
+                    attn_num_head_channels=reversed_attention_head_dim[i],
                     add_upsample=not is_final_block,
                     dropout=self.dropout,
+                    use_linear_projection=self.use_linear_projection,
+                    only_cross_attention=only_cross_attention[i],
                     dtype=self.dtype,
                 )
             else:

src/diffusers/models/vae.py

@@ -565,6 +565,7 @@ class AutoencoderKL(ModelMixin, ConfigMixin):
 
         self.quant_conv = torch.nn.Conv2d(2 * latent_channels, 2 * latent_channels, 1)
         self.post_quant_conv = torch.nn.Conv2d(latent_channels, latent_channels, 1)
+        self.use_slicing = False
 
     def encode(self, x: torch.FloatTensor, return_dict: bool = True) -> AutoencoderKLOutput:
         h = self.encoder(x)
@@ -576,7 +577,7 @@ class AutoencoderKL(ModelMixin, ConfigMixin):
 
         return AutoencoderKLOutput(latent_dist=posterior)
 
-    def decode(self, z: torch.FloatTensor, return_dict: bool = True) -> Union[DecoderOutput, torch.FloatTensor]:
+    def _decode(self, z: torch.FloatTensor, return_dict: bool = True) -> Union[DecoderOutput, torch.FloatTensor]:
         z = self.post_quant_conv(z)
         dec = self.decoder(z)
 
@@ -585,6 +586,34 @@ class AutoencoderKL(ModelMixin, ConfigMixin):
 
         return DecoderOutput(sample=dec)
 
+    def enable_slicing(self):
+        r"""
+        Enable sliced VAE decoding.
+
+        When this option is enabled, the VAE will split the input tensor in slices to compute decoding in several
+        steps. This is useful to save some memory and allow larger batch sizes.
+        """
+        self.use_slicing = True
+
+    def disable_slicing(self):
+        r"""
+        Disable sliced VAE decoding. If `enable_slicing` was previously invoked, this method will go back to computing
+        decoding in one step.
+        """
+        self.use_slicing = False
+
+    def decode(self, z: torch.FloatTensor, return_dict: bool = True) -> Union[DecoderOutput, torch.FloatTensor]:
+        if self.use_slicing and z.shape[0] > 1:
+            decoded_slices = [self._decode(z_slice).sample for z_slice in z.split(1)]
+            decoded = torch.cat(decoded_slices)
+        else:
+            decoded = self._decode(z).sample
+
+        if not return_dict:
+            return (decoded,)
+
+        return DecoderOutput(sample=decoded)
+
     def forward(
         self,
         sample: torch.FloatTensor,

src/diffusers/pipeline_flax_utils.py

@@ -317,8 +317,8 @@ class FlaxDiffusionPipeline(ConfigMixin):
             allow_patterns = [os.path.join(k, "*") for k in folder_names]
             allow_patterns += [FLAX_WEIGHTS_NAME, SCHEDULER_CONFIG_NAME, CONFIG_NAME, cls.config_name]
 
-            # make sure we don't download PyTorch weights
-            ignore_patterns = "*.bin"
+            # make sure we don't download PyTorch weights, unless when using from_pt
+            ignore_patterns = "*.bin" if not from_pt else []
 
             if cls != FlaxDiffusionPipeline:
                 requested_pipeline_class = cls.__name__
@@ -411,13 +411,13 @@ class FlaxDiffusionPipeline(ConfigMixin):
                             f" {expected_class_obj}"
                         )
                 elif passed_class_obj[name] is None:
-                    logger.warn(
+                    logger.warning(
                         f"You have passed `None` for {name} to disable its functionality in {pipeline_class}. Note"
                         f" that this might lead to problems when using {pipeline_class} and is not recommended."
                     )
                     sub_model_should_be_defined = False
                 else:
-                    logger.warn(
+                    logger.warning(
                         f"You have passed a non-standard module {passed_class_obj[name]}. We cannot verify whether it"
                         " has the correct type"
                     )

src/diffusers/pipeline_utils.py

@@ -18,6 +18,7 @@ import importlib
 import inspect
 import os
 from dataclasses import dataclass
+from pathlib import Path
 from typing import Any, Dict, List, Optional, Union
 
 import numpy as np
@@ -25,7 +26,7 @@ import torch
 
 import diffusers
 import PIL
-from huggingface_hub import snapshot_download
+from huggingface_hub import model_info, snapshot_download
 from packaging import version
 from PIL import Image
 from tqdm.auto import tqdm
@@ -43,6 +44,7 @@ from .utils import (
     BaseOutput,
     deprecate,
     is_accelerate_available,
+    is_safetensors_available,
     is_torch_version,
     is_transformers_available,
     logging,
@@ -78,6 +80,9 @@ LOADABLE_CLASSES = {
         "ProcessorMixin": ["save_pretrained", "from_pretrained"],
         "ImageProcessingMixin": ["save_pretrained", "from_pretrained"],
     },
+    "onnxruntime.training": {
+        "ORTModule": ["save_pretrained", "from_pretrained"],
+    },
 }
 
 ALL_IMPORTABLE_CLASSES = {}
@@ -113,6 +118,23 @@ class AudioPipelineOutput(BaseOutput):
     audios: np.ndarray
 
 
+def is_safetensors_compatible(info) -> bool:
+    filenames = set(sibling.rfilename for sibling in info.siblings)
+    pt_filenames = set(filename for filename in filenames if filename.endswith(".bin"))
+    is_safetensors_compatible = any(file.endswith(".safetensors") for file in filenames)
+    for pt_filename in pt_filenames:
+        prefix, raw = os.path.split(pt_filename)
+        if raw == "pytorch_model.bin":
+            # transformers specific
+            sf_filename = os.path.join(prefix, "model.safetensors")
+        else:
+            sf_filename = pt_filename[: -len(".bin")] + ".safetensors"
+        if is_safetensors_compatible and sf_filename not in filenames:
+            logger.warning(f"{sf_filename} not found")
+            is_safetensors_compatible = False
+    return is_safetensors_compatible
+
+
 class DiffusionPipeline(ConfigMixin):
     r"""
     Base class for all models.
@@ -125,10 +147,13 @@ class DiffusionPipeline(ConfigMixin):
 
     Class attributes:
 
-        - **config_name** ([`str`]) -- name of the config file that will store the class and module names of all
+        - **config_name** (`str`) -- name of the config file that will store the class and module names of all
           components of the diffusion pipeline.
+        - **_optional_components** (List[`str`]) -- list of all components that are optional so they don't have to be
+          passed for the pipeline to function (should be overridden by subclasses).
     """
     config_name = "model_index.json"
+    _optional_components = []
 
     def register_modules(self, **kwargs):
         # import it here to avoid circular import
@@ -180,12 +205,19 @@ class DiffusionPipeline(ConfigMixin):
         model_index_dict.pop("_diffusers_version")
         model_index_dict.pop("_module", None)
 
+        expected_modules, optional_kwargs = self._get_signature_keys(self)
+
+        def is_saveable_module(name, value):
+            if name not in expected_modules:
+                return False
+            if name in self._optional_components and value[0] is None:
+                return False
+            return True
+
+        model_index_dict = {k: v for k, v in model_index_dict.items() if is_saveable_module(k, v)}
+
         for pipeline_component_name in model_index_dict.keys():
             sub_model = getattr(self, pipeline_component_name)
-            if sub_model is None:
-                # edge case for saving a pipeline with safety_checker=None
-                continue
-
             model_cls = sub_model.__class__
 
             save_method_name = None
@@ -401,7 +433,7 @@ class DiffusionPipeline(ConfigMixin):
 
         if low_cpu_mem_usage and not is_accelerate_available():
             low_cpu_mem_usage = False
-            logger.warn(
+            logger.warning(
                 "Cannot initialize model with low cpu memory usage because `accelerate` was not found in the"
                 " environment. Defaulting to `low_cpu_mem_usage=False`. It is strongly recommended to install"
                 " `accelerate` for faster and less memory-intense model loading. You can do so with: \n```\npip"
@@ -445,7 +477,7 @@ class DiffusionPipeline(ConfigMixin):
             allow_patterns += [WEIGHTS_NAME, SCHEDULER_CONFIG_NAME, CONFIG_NAME, ONNX_WEIGHTS_NAME, cls.config_name]
 
             # make sure we don't download flax weights
-            ignore_patterns = "*.msgpack"
+            ignore_patterns = ["*.msgpack"]
 
             if custom_pipeline is not None:
                 allow_patterns += [CUSTOM_PIPELINE_FILE_NAME]
@@ -459,6 +491,15 @@ class DiffusionPipeline(ConfigMixin):
                 user_agent["custom_pipeline"] = custom_pipeline
             user_agent = http_user_agent(user_agent)
 
+            if is_safetensors_available():
+                info = model_info(
+                    pretrained_model_name_or_path,
+                    use_auth_token=use_auth_token,
+                    revision=revision,
+                )
+                if is_safetensors_compatible(info):
+                    ignore_patterns.append("*.bin")
+
             # download all allow_patterns
             cached_folder = snapshot_download(
                 pretrained_model_name_or_path,
@@ -480,8 +521,16 @@ class DiffusionPipeline(ConfigMixin):
         # 2. Load the pipeline class, if using custom module then load it from the hub
         # if we load from explicit class, let's use it
         if custom_pipeline is not None:
+            if custom_pipeline.endswith(".py"):
+                path = Path(custom_pipeline)
+                # decompose into folder & file
+                file_name = path.name
+                custom_pipeline = path.parent.absolute()
+            else:
+                file_name = CUSTOM_PIPELINE_FILE_NAME
+
             pipeline_class = get_class_from_dynamic_module(
-                custom_pipeline, module_file=CUSTOM_PIPELINE_FILE_NAME, cache_dir=custom_pipeline
+                custom_pipeline, module_file=file_name, cache_dir=custom_pipeline
             )
         elif cls != DiffusionPipeline:
             pipeline_class = cls
@@ -511,38 +560,47 @@ class DiffusionPipeline(ConfigMixin):
         # some modules can be passed directly to the init
         # in this case they are already instantiated in `kwargs`
         # extract them here
-        expected_modules = set(inspect.signature(pipeline_class.__init__).parameters.keys()) - set(["self"])
+        expected_modules, optional_kwargs = cls._get_signature_keys(pipeline_class)
         passed_class_obj = {k: kwargs.pop(k) for k in expected_modules if k in kwargs}
+        passed_pipe_kwargs = {k: kwargs.pop(k) for k in optional_kwargs if k in kwargs}
 
         init_dict, unused_kwargs, _ = pipeline_class.extract_init_dict(config_dict, **kwargs)
 
-        if len(unused_kwargs) > 0:
-            logger.warning(f"Keyword arguments {unused_kwargs} not recognized.")
+        # define init kwargs
+        init_kwargs = {k: init_dict.pop(k) for k in optional_kwargs if k in init_dict}
+        init_kwargs = {**init_kwargs, **passed_pipe_kwargs}
 
-        init_kwargs = {}
+        # remove `null` components
+        def load_module(name, value):
+            if value[0] is None:
+                return False
+            if name in passed_class_obj and passed_class_obj[name] is None:
+                return False
+            return True
+
+        init_dict = {k: v for k, v in init_dict.items() if load_module(k, v)}
+
+        if len(unused_kwargs) > 0:
+            logger.warning(
+                f"Keyword arguments {unused_kwargs} are not expected by {pipeline_class.__name__} and will be ignored."
+            )
 
         # import it here to avoid circular import
         from diffusers import pipelines
 
         # 3. Load each module in the pipeline
         for name, (library_name, class_name) in init_dict.items():
-            if class_name is None:
-                # edge case for when the pipeline was saved with safety_checker=None
-                init_kwargs[name] = None
-                continue
-
             # 3.1 - now that JAX/Flax is an official framework of the library, we might load from Flax names
             if class_name.startswith("Flax"):
                 class_name = class_name[4:]
 
             is_pipeline_module = hasattr(pipelines, library_name)
             loaded_sub_model = None
-            sub_model_should_be_defined = True
 
             # if the model is in a pipeline module, then we load it from the pipeline
             if name in passed_class_obj:
                 # 1. check that passed_class_obj has correct parent class
-                if not is_pipeline_module and passed_class_obj[name] is not None:
+                if not is_pipeline_module:
                     library = importlib.import_module(library_name)
                     class_obj = getattr(library, class_name)
                     importable_classes = LOADABLE_CLASSES[library_name]
@@ -558,14 +616,8 @@ class DiffusionPipeline(ConfigMixin):
                             f"{passed_class_obj[name]} is of type: {type(passed_class_obj[name])}, but should be"
                             f" {expected_class_obj}"
                         )
-                elif passed_class_obj[name] is None:
-                    logger.warn(
-                        f"You have passed `None` for {name} to disable its functionality in {pipeline_class}. Note"
-                        f" that this might lead to problems when using {pipeline_class} and is not recommended."
-                    )
-                    sub_model_should_be_defined = False
                 else:
-                    logger.warn(
+                    logger.warning(
                         f"You have passed a non-standard module {passed_class_obj[name]}. We cannot verify whether it"
                         " has the correct type"
                     )
@@ -585,7 +637,7 @@ class DiffusionPipeline(ConfigMixin):
                 importable_classes = LOADABLE_CLASSES[library_name]
                 class_candidates = {c: getattr(library, c, None) for c in importable_classes.keys()}
 
-            if loaded_sub_model is None and sub_model_should_be_defined:
+            if loaded_sub_model is None:
                 load_method_name = None
                 for class_name, class_candidate in class_candidates.items():
                     if class_candidate is not None and issubclass(class_obj, class_candidate):
@@ -639,11 +691,13 @@ class DiffusionPipeline(ConfigMixin):
 
         # 4. Potentially add passed objects if expected
         missing_modules = set(expected_modules) - set(init_kwargs.keys())
-        if len(missing_modules) > 0 and missing_modules <= set(passed_class_obj.keys()):
+        passed_modules = list(passed_class_obj.keys())
+        optional_modules = pipeline_class._optional_components
+        if len(missing_modules) > 0 and missing_modules <= set(passed_modules + optional_modules):
             for module in missing_modules:
-                init_kwargs[module] = passed_class_obj[module]
+                init_kwargs[module] = passed_class_obj.get(module, None)
         elif len(missing_modules) > 0:
-            passed_modules = set(list(init_kwargs.keys()) + list(passed_class_obj.keys()))
+            passed_modules = set(list(init_kwargs.keys()) + list(passed_class_obj.keys())) - optional_kwargs
             raise ValueError(
                 f"Pipeline {pipeline_class} expected {expected_modules}, but only {passed_modules} were passed."
             )
@@ -652,6 +706,14 @@ class DiffusionPipeline(ConfigMixin):
         model = pipeline_class(**init_kwargs)
         return model
 
+    @staticmethod
+    def _get_signature_keys(obj):
+        parameters = inspect.signature(obj.__init__).parameters
+        required_parameters = {k: v for k, v in parameters.items() if v.default == inspect._empty}
+        optional_parameters = set({k for k, v in parameters.items() if v.default != inspect._empty})
+        expected_modules = set(required_parameters.keys()) - set(["self"])
+        return expected_modules, optional_parameters
+
     @property
     def components(self) -> Dict[str, Any]:
         r"""
@@ -668,16 +730,18 @@ class DiffusionPipeline(ConfigMixin):
         ...     StableDiffusionInpaintPipeline,
         ... )
 
-        >>> img2text = StableDiffusionPipeline.from_pretrained("runwayml/stable-diffusion-v1-5")
-        >>> img2img = StableDiffusionImg2ImgPipeline(**img2text.components)
-        >>> inpaint = StableDiffusionInpaintPipeline(**img2text.components)
+        >>> text2img = StableDiffusionPipeline.from_pretrained("runwayml/stable-diffusion-v1-5")
+        >>> img2img = StableDiffusionImg2ImgPipeline(**text2img.components)
+        >>> inpaint = StableDiffusionInpaintPipeline(**text2img.components)
         ```
 
         Returns:
             A dictionaly containing all the modules needed to initialize the pipeline.
         """
-        components = {k: getattr(self, k) for k in self.config.keys() if not k.startswith("_")}
-        expected_modules = set(inspect.signature(self.__init__).parameters.keys()) - set(["self"])
+        expected_modules, optional_parameters = self._get_signature_keys(self)
+        components = {
+            k: getattr(self, k) for k in self.config.keys() if not k.startswith("_") and k not in optional_parameters
+        }
 
         if set(components.keys()) != expected_modules:
             raise ValueError(
@@ -703,7 +767,7 @@ class DiffusionPipeline(ConfigMixin):
 
         return pil_images
 
-    def progress_bar(self, iterable):
+    def progress_bar(self, iterable=None, total=None):
         if not hasattr(self, "_progress_bar_config"):
             self._progress_bar_config = {}
         elif not isinstance(self._progress_bar_config, dict):
@@ -711,7 +775,12 @@ class DiffusionPipeline(ConfigMixin):
                 f"`self._progress_bar_config` should be of type `dict`, but is {type(self._progress_bar_config)}."
             )
 
-        return tqdm(iterable, **self._progress_bar_config)
+        if iterable is not None:
+            return tqdm(iterable, **self._progress_bar_config)
+        elif total is not None:
+            return tqdm(total=total, **self._progress_bar_config)
+        else:
+            raise ValueError("Either `total` or `iterable` has to be defined.")
 
     def set_progress_bar_config(self, **kwargs):
         self._progress_bar_config = kwargs

src/diffusers/pipelines/__init__.py

@@ -19,11 +19,19 @@ if is_torch_available() and is_transformers_available():
     from .latent_diffusion import LDMTextToImagePipeline
     from .stable_diffusion import (
         CycleDiffusionPipeline,
+        StableDiffusionImageVariationPipeline,
         StableDiffusionImg2ImgPipeline,
         StableDiffusionInpaintPipeline,
         StableDiffusionInpaintPipelineLegacy,
         StableDiffusionPipeline,
-        StableDiffusionUpscalerPipeline,
+        StableDiffusionUpscalePipeline,
+    )
+    from .stable_diffusion_safe import StableDiffusionPipelineSafe
+    from .versatile_diffusion import (
+        VersatileDiffusionDualGuidedPipeline,
+        VersatileDiffusionImageVariationPipeline,
+        VersatileDiffusionPipeline,
+        VersatileDiffusionTextToImagePipeline,
     )
     from .vq_diffusion import VQDiffusionPipeline
 
@@ -31,6 +39,7 @@ if is_transformers_available() and is_onnx_available():
     from .stable_diffusion import (
         OnnxStableDiffusionImg2ImgPipeline,
         OnnxStableDiffusionInpaintPipeline,
+        OnnxStableDiffusionInpaintPipelineLegacy,
         OnnxStableDiffusionPipeline,
         StableDiffusionOnnxPipeline,
     )

src/diffusers/pipelines/alt_diffusion/pipeline_alt_diffusion.py

@@ -18,6 +18,7 @@ from typing import Callable, List, Optional, Union
 import torch
 
 from diffusers.utils import is_accelerate_available
+from packaging import version
 from transformers import CLIPFeatureExtractor, XLMRobertaTokenizer
 
 from ...configuration_utils import FrozenDict
@@ -67,6 +68,7 @@ class AltDiffusionPipeline(DiffusionPipeline):
         feature_extractor ([`CLIPFeatureExtractor`]):
             Model that extracts features from generated images to be used as inputs for the `safety_checker`.
     """
+    _optional_components = ["safety_checker", "feature_extractor"]
 
     def __init__(
         self,
@@ -84,6 +86,7 @@ class AltDiffusionPipeline(DiffusionPipeline):
         ],
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -114,8 +117,8 @@ class AltDiffusionPipeline(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
-            logger.warn(
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Alt Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -124,6 +127,33 @@ class AltDiffusionPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -133,6 +163,8 @@ class AltDiffusionPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     def enable_xformers_memory_efficient_attention(self):
         r"""
@@ -166,9 +198,14 @@ class AltDiffusionPipeline(DiffusionPipeline):
                 `attention_head_dim` must be a multiple of `slice_size`.
         """
         if slice_size == "auto":
-            # half the attention head size is usually a good trade-off between
-            # speed and memory
-            slice_size = self.unet.config.attention_head_dim // 2
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
         self.unet.set_attention_slice(slice_size)
 
     def disable_attention_slicing(self):
@@ -179,7 +216,23 @@ class AltDiffusionPipeline(DiffusionPipeline):
         # set slice_size = `None` to disable `attention slicing`
         self.enable_attention_slicing(None)
 
-    def enable_sequential_cpu_offload(self):
+    def enable_vae_slicing(self):
+        r"""
+        Enable sliced VAE decoding.
+
+        When this option is enabled, the VAE will split the input tensor in slices to compute decoding in several
+        steps. This is useful to save some memory and allow larger batch sizes.
+        """
+        self.vae.enable_slicing()
+
+    def disable_vae_slicing(self):
+        r"""
+        Disable sliced VAE decoding. If `enable_vae_slicing` was previously invoked, this method will go back to
+        computing decoding in one step.
+        """
+        self.vae.disable_slicing()
+
+    def enable_sequential_cpu_offload(self, gpu_id=0):
         r"""
         Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
         text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
@@ -190,12 +243,17 @@ class AltDiffusionPipeline(DiffusionPipeline):
         else:
             raise ImportError("Please install accelerate via `pip install accelerate`")
 
-        device = torch.device("cuda")
+        device = torch.device(f"cuda:{gpu_id}")
 
-        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae]:
             if cpu_offloaded_model is not None:
                 cpu_offload(cpu_offloaded_model, device)
 
+        if self.safety_checker is not None:
+            # TODO(Patrick) - there is currently a bug with cpu offload of nn.Parameter in accelerate
+            # fix by only offloading self.safety_checker for now
+            cpu_offload(self.safety_checker.vision_model, device)
+
     @property
     def _execution_device(self):
         r"""
@@ -370,7 +428,7 @@ class AltDiffusionPipeline(DiffusionPipeline):
             )
 
     def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
-        shape = (batch_size, num_channels_latents, height // 8, width // 8)
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
         if latents is None:
             if device.type == "mps":
                 # randn does not work reproducibly on mps
@@ -390,8 +448,8 @@ class AltDiffusionPipeline(DiffusionPipeline):
     def __call__(
         self,
         prompt: Union[str, List[str]],
-        height: int = 512,
-        width: int = 512,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
         num_inference_steps: int = 50,
         guidance_scale: float = 7.5,
         negative_prompt: Optional[Union[str, List[str]]] = None,
@@ -403,7 +461,6 @@ class AltDiffusionPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -411,9 +468,9 @@ class AltDiffusionPipeline(DiffusionPipeline):
         Args:
             prompt (`str` or `List[str]`):
                 The prompt or prompts to guide the image generation.
-            height (`int`, *optional*, defaults to 512):
+            height (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The height in pixels of the generated image.
-            width (`int`, *optional*, defaults to 512):
+            width (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The width in pixels of the generated image.
             num_inference_steps (`int`, *optional*, defaults to 50):
                 The number of denoising steps. More denoising steps usually lead to a higher quality image at the
@@ -459,6 +516,9 @@ class AltDiffusionPipeline(DiffusionPipeline):
             list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
             (nsfw) content, according to the `safety_checker`.
         """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
 
         # 1. Check inputs. Raise error if not correct
         self.check_inputs(prompt, height, width, callback_steps)
@@ -497,25 +557,29 @@ class AltDiffusionPipeline(DiffusionPipeline):
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
         # 7. Denoising loop
-        for i, t in enumerate(self.progress_bar(timesteps)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
 
-            # predict the noise residual
-            noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
 
-            # perform guidance
-            if do_classifier_free_guidance:
-                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
-                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+                    # compute the previous noisy sample x_t -> x_t-1
+                    latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
 
-            # call the callback, if provided
-            if callback is not None and i % callback_steps == 0:
-                callback(i, t, latents)
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
 
         # 8. Post-processing
         image = self.decode_latents(latents)

src/diffusers/pipelines/alt_diffusion/pipeline_alt_diffusion_img2img.py

@@ -20,6 +20,7 @@ import torch
 
 import PIL
 from diffusers.utils import is_accelerate_available
+from packaging import version
 from transformers import CLIPFeatureExtractor, XLMRobertaTokenizer
 
 from ...configuration_utils import FrozenDict
@@ -80,8 +81,8 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         feature_extractor ([`CLIPFeatureExtractor`]):
             Model that extracts features from generated images to be used as inputs for the `safety_checker`.
     """
+    _optional_components = ["safety_checker", "feature_extractor"]
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.__init__
     def __init__(
         self,
         vae: AutoencoderKL,
@@ -98,6 +99,7 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         ],
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -128,8 +130,8 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
-            logger.warn(
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Alt Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -138,6 +140,33 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -147,8 +176,9 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.enable_attention_slicing
     def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
         r"""
         Enable sliced attention computation.
@@ -163,12 +193,16 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
                 `attention_head_dim` must be a multiple of `slice_size`.
         """
         if slice_size == "auto":
-            # half the attention head size is usually a good trade-off between
-            # speed and memory
-            slice_size = self.unet.config.attention_head_dim // 2
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
         self.unet.set_attention_slice(slice_size)
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.disable_attention_slicing
     def disable_attention_slicing(self):
         r"""
         Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
@@ -177,8 +211,7 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         # set slice_size = `None` to disable `attention slicing`
         self.enable_attention_slicing(None)
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.enable_sequential_cpu_offload
-    def enable_sequential_cpu_offload(self):
+    def enable_sequential_cpu_offload(self, gpu_id=0):
         r"""
         Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
         text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
@@ -189,14 +222,18 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         else:
             raise ImportError("Please install accelerate via `pip install accelerate`")
 
-        device = torch.device("cuda")
+        device = torch.device(f"cuda:{gpu_id}")
 
-        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae]:
             if cpu_offloaded_model is not None:
                 cpu_offload(cpu_offloaded_model, device)
 
+        if self.safety_checker is not None:
+            # TODO(Patrick) - there is currently a bug with cpu offload of nn.Parameter in accelerate
+            # fix by only offloading self.safety_checker for now
+            cpu_offload(self.safety_checker.vision_model, device)
+
     @property
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline._execution_device
     def _execution_device(self):
         r"""
         Returns the device on which the pipeline's models will be executed. After calling
@@ -214,7 +251,6 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
                 return torch.device(module._hf_hook.execution_device)
         return self.device
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.enable_xformers_memory_efficient_attention
     def enable_xformers_memory_efficient_attention(self):
         r"""
         Enable memory efficient attention as implemented in xformers.
@@ -227,14 +263,12 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         """
         self.unet.set_use_memory_efficient_attention_xformers(True)
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.disable_xformers_memory_efficient_attention
     def disable_xformers_memory_efficient_attention(self):
         r"""
         Disable memory efficient attention as implemented in xformers.
         """
         self.unet.set_use_memory_efficient_attention_xformers(False)
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline._encode_prompt
     def _encode_prompt(self, prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
         r"""
         Encodes the prompt into text encoder hidden states.
@@ -340,7 +374,6 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
 
         return text_embeddings
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.run_safety_checker
     def run_safety_checker(self, image, device, dtype):
         if self.safety_checker is not None:
             safety_checker_input = self.feature_extractor(self.numpy_to_pil(image), return_tensors="pt").to(device)
@@ -351,7 +384,6 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
             has_nsfw_concept = None
         return image, has_nsfw_concept
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.decode_latents
     def decode_latents(self, latents):
         latents = 1 / 0.18215 * latents
         image = self.vae.decode(latents).sample
@@ -360,7 +392,6 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         image = image.cpu().permute(0, 2, 3, 1).float().numpy()
         return image
 
-    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.AltDiffusionPipeline.prepare_extra_step_kwargs
     def prepare_extra_step_kwargs(self, generator, eta):
         # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
         # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
@@ -402,7 +433,7 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         t_start = max(num_inference_steps - init_timestep + offset, 0)
         timesteps = self.scheduler.timesteps[t_start:]
 
-        return timesteps
+        return timesteps, num_inference_steps - t_start
 
     def prepare_latents(self, init_image, timestep, batch_size, num_images_per_prompt, dtype, device, generator=None):
         init_image = init_image.to(device=device, dtype=dtype)
@@ -453,7 +484,6 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -532,7 +562,7 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
 
         # 5. set timesteps
         self.scheduler.set_timesteps(num_inference_steps, device=device)
-        timesteps = self.get_timesteps(num_inference_steps, strength, device)
+        timesteps, num_inference_steps = self.get_timesteps(num_inference_steps, strength, device)
         latent_timestep = timesteps[:1].repeat(batch_size * num_images_per_prompt)
 
         # 6. Prepare latent variables
@@ -544,25 +574,29 @@ class AltDiffusionImg2ImgPipeline(DiffusionPipeline):
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
         # 8. Denoising loop
-        for i, t in enumerate(self.progress_bar(timesteps)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
 
-            # predict the noise residual
-            noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
 
-            # perform guidance
-            if do_classifier_free_guidance:
-                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
-                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+                # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
 
-            # call the callback, if provided
-            if callback is not None and i % callback_steps == 0:
-                callback(i, t, latents)
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
 
         # 9. Post-processing
         image = self.decode_latents(latents)

src/diffusers/pipelines/ddim/pipeline_ddim.py

@@ -89,7 +89,11 @@ class DDIMPipeline(DiffusionPipeline):
             generator = None
 
         # Sample gaussian noise to begin loop
-        image_shape = (batch_size, self.unet.in_channels, self.unet.sample_size, self.unet.sample_size)
+        if isinstance(self.unet.sample_size, int):
+            image_shape = (batch_size, self.unet.in_channels, self.unet.sample_size, self.unet.sample_size)
+        else:
+            image_shape = (batch_size, self.unet.in_channels, *self.unet.sample_size)
+
         if self.device.type == "mps":
             # randn does not work reproducibly on mps
             image = torch.randn(image_shape, generator=generator)

src/diffusers/pipelines/ddpm/pipeline_ddpm.py

@@ -70,14 +70,14 @@ class DDPMPipeline(DiffusionPipeline):
             generated images.
         """
         message = (
-            "Please make sure to instantiate your scheduler with `predict_epsilon` instead. E.g. `scheduler ="
-            " DDPMScheduler.from_pretrained(<model_id>, predict_epsilon=True)`."
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " DDPMScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
         )
         predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
 
         if predict_epsilon is not None:
             new_config = dict(self.scheduler.config)
-            new_config["predict_epsilon"] = predict_epsilon
+            new_config["prediction_type"] = "epsilon" if predict_epsilon else "sample"
             self.scheduler._internal_dict = FrozenDict(new_config)
 
         if generator is not None and generator.device.type != self.device.type and self.device.type != "mps":
@@ -94,7 +94,11 @@ class DDPMPipeline(DiffusionPipeline):
             generator = None
 
         # Sample gaussian noise to begin loop
-        image_shape = (batch_size, self.unet.in_channels, self.unet.sample_size, self.unet.sample_size)
+        if isinstance(self.unet.sample_size, int):
+            image_shape = (batch_size, self.unet.in_channels, self.unet.sample_size, self.unet.sample_size)
+        else:
+            image_shape = (batch_size, self.unet.in_channels, *self.unet.sample_size)
+
         if self.device.type == "mps":
             # randn does not work reproducibly on mps
             image = torch.randn(image_shape, generator=generator)
@@ -110,9 +114,7 @@ class DDPMPipeline(DiffusionPipeline):
             model_output = self.unet(image, t).sample
 
             # 2. compute previous image: x_t -> x_t-1
-            image = self.scheduler.step(
-                model_output, t, image, generator=generator, predict_epsilon=predict_epsilon
-            ).prev_sample
+            image = self.scheduler.step(model_output, t, image, generator=generator).prev_sample
 
         image = (image / 2 + 0.5).clamp(0, 1)
         image = image.cpu().permute(0, 2, 3, 1).numpy()

src/diffusers/pipelines/latent_diffusion/pipeline_latent_diffusion.py

@@ -60,13 +60,14 @@ class LDMTextToImagePipeline(DiffusionPipeline):
     ):
         super().__init__()
         self.register_modules(vqvae=vqvae, bert=bert, tokenizer=tokenizer, unet=unet, scheduler=scheduler)
+        self.vae_scale_factor = 2 ** (len(self.vqvae.config.block_out_channels) - 1)
 
     @torch.no_grad()
     def __call__(
         self,
         prompt: Union[str, List[str]],
-        height: Optional[int] = 256,
-        width: Optional[int] = 256,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
         num_inference_steps: Optional[int] = 50,
         guidance_scale: Optional[float] = 1.0,
         eta: Optional[float] = 0.0,
@@ -79,9 +80,9 @@ class LDMTextToImagePipeline(DiffusionPipeline):
         Args:
             prompt (`str` or `List[str]`):
                 The prompt or prompts to guide the image generation.
-            height (`int`, *optional*, defaults to 256):
+            height (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The height in pixels of the generated image.
-            width (`int`, *optional*, defaults to 256):
+            width (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The width in pixels of the generated image.
             num_inference_steps (`int`, *optional*, defaults to 50):
                 The number of denoising steps. More denoising steps usually lead to a higher quality image at the
@@ -106,6 +107,9 @@ class LDMTextToImagePipeline(DiffusionPipeline):
             `return_dict` is True, otherwise a `tuple. When returning a tuple, the first element is a list with the
             generated images.
         """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
 
         if isinstance(prompt, str):
             batch_size = 1

src/diffusers/pipelines/stable_diffusion/__init__.py

@@ -6,7 +6,14 @@ import numpy as np
 import PIL
 from PIL import Image
 
-from ...utils import BaseOutput, is_flax_available, is_onnx_available, is_torch_available, is_transformers_available
+from ...utils import (
+    BaseOutput,
+    is_flax_available,
+    is_onnx_available,
+    is_torch_available,
+    is_transformers_available,
+    is_transformers_version,
+)
 
 
 @dataclass
@@ -33,13 +40,19 @@ if is_transformers_available() and is_torch_available():
     from .pipeline_stable_diffusion_img2img import StableDiffusionImg2ImgPipeline
     from .pipeline_stable_diffusion_inpaint import StableDiffusionInpaintPipeline
     from .pipeline_stable_diffusion_inpaint_legacy import StableDiffusionInpaintPipelineLegacy
-    from .pipeline_stable_diffusion_upscaler import StableDiffusionUpscalerPipeline
+    from .pipeline_stable_diffusion_upscale import StableDiffusionUpscalePipeline
     from .safety_checker import StableDiffusionSafetyChecker
 
+if is_transformers_available() and is_torch_available() and is_transformers_version(">=", "4.25.0.dev0"):
+    from .pipeline_stable_diffusion_image_variation import StableDiffusionImageVariationPipeline
+else:
+    from ...utils.dummy_torch_and_transformers_objects import StableDiffusionImageVariationPipeline
+
 if is_transformers_available() and is_onnx_available():
     from .pipeline_onnx_stable_diffusion import OnnxStableDiffusionPipeline, StableDiffusionOnnxPipeline
     from .pipeline_onnx_stable_diffusion_img2img import OnnxStableDiffusionImg2ImgPipeline
     from .pipeline_onnx_stable_diffusion_inpaint import OnnxStableDiffusionInpaintPipeline
+    from .pipeline_onnx_stable_diffusion_inpaint_legacy import OnnxStableDiffusionInpaintPipelineLegacy
 
 if is_transformers_available() and is_flax_available():
     import flax
@@ -50,15 +63,14 @@ if is_transformers_available() and is_flax_available():
         Output class for Stable Diffusion pipelines.
 
         Args:
-            images (`List[PIL.Image.Image]` or `np.ndarray`)
-                List of denoised PIL images of length `batch_size` or numpy array of shape `(batch_size, height, width,
-                num_channels)`. PIL images or numpy array present the denoised images of the diffusion pipeline.
+            images (`np.ndarray`)
+                Array of shape `(batch_size, height, width, num_channels)` with images from the diffusion pipeline.
             nsfw_content_detected (`List[bool]`)
                 List of flags denoting whether the corresponding generated image likely represents "not-safe-for-work"
                 (nsfw) content.
         """
 
-        images: Union[List[PIL.Image.Image], np.ndarray]
+        images: np.ndarray
         nsfw_content_detected: List[bool]
 
     from ...schedulers.scheduling_pndm_flax import PNDMSchedulerState

src/diffusers/pipelines/stable_diffusion/pipeline_cycle_diffusion.py

@@ -20,6 +20,7 @@ import torch
 
 import PIL
 from diffusers.utils import is_accelerate_available
+from packaging import version
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 from ...configuration_utils import FrozenDict
@@ -132,6 +133,7 @@ class CycleDiffusionPipeline(DiffusionPipeline):
         feature_extractor ([`CLIPFeatureExtractor`]):
             Model that extracts features from generated images to be used as inputs for the `safety_checker`.
     """
+    _optional_components = ["safety_checker", "feature_extractor"]
 
     def __init__(
         self,
@@ -142,6 +144,7 @@ class CycleDiffusionPipeline(DiffusionPipeline):
         scheduler: DDIMScheduler,
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -159,8 +162,8 @@ class CycleDiffusionPipeline(DiffusionPipeline):
             new_config["steps_offset"] = 1
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
-            logger.warn(
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -169,6 +172,32 @@ class CycleDiffusionPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -178,6 +207,7 @@ class CycleDiffusionPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing
     def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
@@ -194,9 +224,14 @@ class CycleDiffusionPipeline(DiffusionPipeline):
                 `attention_head_dim` must be a multiple of `slice_size`.
         """
         if slice_size == "auto":
-            # half the attention head size is usually a good trade-off between
-            # speed and memory
-            slice_size = self.unet.config.attention_head_dim // 2
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
         self.unet.set_attention_slice(slice_size)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
@@ -209,7 +244,7 @@ class CycleDiffusionPipeline(DiffusionPipeline):
         self.enable_attention_slicing(None)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_sequential_cpu_offload
-    def enable_sequential_cpu_offload(self):
+    def enable_sequential_cpu_offload(self, gpu_id=0):
         r"""
         Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
         text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
@@ -220,12 +255,17 @@ class CycleDiffusionPipeline(DiffusionPipeline):
         else:
             raise ImportError("Please install accelerate via `pip install accelerate`")
 
-        device = torch.device("cuda")
+        device = torch.device(f"cuda:{gpu_id}")
 
-        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae]:
             if cpu_offloaded_model is not None:
                 cpu_offload(cpu_offloaded_model, device)
 
+        if self.safety_checker is not None:
+            # TODO(Patrick) - there is currently a bug with cpu offload of nn.Parameter in accelerate
+            # fix by only offloading self.safety_checker for now
+            cpu_offload(self.safety_checker.vision_model, device)
+
     @property
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device
     def _execution_device(self):
@@ -435,7 +475,7 @@ class CycleDiffusionPipeline(DiffusionPipeline):
         t_start = max(num_inference_steps - init_timestep + offset, 0)
         timesteps = self.scheduler.timesteps[t_start:]
 
-        return timesteps
+        return timesteps, num_inference_steps - t_start
 
     def prepare_latents(self, init_image, timestep, batch_size, num_images_per_prompt, dtype, device, generator=None):
         init_image = init_image.to(device=device, dtype=dtype)
@@ -488,7 +528,6 @@ class CycleDiffusionPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -568,7 +607,7 @@ class CycleDiffusionPipeline(DiffusionPipeline):
 
         # 5. Prepare timesteps
         self.scheduler.set_timesteps(num_inference_steps, device=device)
-        timesteps = self.get_timesteps(num_inference_steps, strength, device)
+        timesteps, num_inference_steps = self.get_timesteps(num_inference_steps, strength, device)
         latent_timestep = timesteps[:1].repeat(batch_size * num_images_per_prompt)
 
         # 6. Prepare latent variables
@@ -582,66 +621,70 @@ class CycleDiffusionPipeline(DiffusionPipeline):
         generator = extra_step_kwargs.pop("generator", None)
 
         # 8. Denoising loop
-        for i, t in enumerate(self.progress_bar(timesteps)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2)
-            source_latent_model_input = torch.cat([source_latents] * 2)
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
-            source_latent_model_input = self.scheduler.scale_model_input(source_latent_model_input, t)
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2)
+                source_latent_model_input = torch.cat([source_latents] * 2)
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+                source_latent_model_input = self.scheduler.scale_model_input(source_latent_model_input, t)
 
-            # predict the noise residual
-            concat_latent_model_input = torch.stack(
-                [
-                    source_latent_model_input[0],
-                    latent_model_input[0],
-                    source_latent_model_input[1],
-                    latent_model_input[1],
-                ],
-                dim=0,
-            )
-            concat_text_embeddings = torch.stack(
-                [
-                    source_text_embeddings[0],
-                    text_embeddings[0],
-                    source_text_embeddings[1],
-                    text_embeddings[1],
-                ],
-                dim=0,
-            )
-            concat_noise_pred = self.unet(
-                concat_latent_model_input, t, encoder_hidden_states=concat_text_embeddings
-            ).sample
+                # predict the noise residual
+                concat_latent_model_input = torch.stack(
+                    [
+                        source_latent_model_input[0],
+                        latent_model_input[0],
+                        source_latent_model_input[1],
+                        latent_model_input[1],
+                    ],
+                    dim=0,
+                )
+                concat_text_embeddings = torch.stack(
+                    [
+                        source_text_embeddings[0],
+                        text_embeddings[0],
+                        source_text_embeddings[1],
+                        text_embeddings[1],
+                    ],
+                    dim=0,
+                )
+                concat_noise_pred = self.unet(
+                    concat_latent_model_input, t, encoder_hidden_states=concat_text_embeddings
+                ).sample
 
-            # perform guidance
-            (
-                source_noise_pred_uncond,
-                noise_pred_uncond,
-                source_noise_pred_text,
-                noise_pred_text,
-            ) = concat_noise_pred.chunk(4, dim=0)
-            noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
-            source_noise_pred = source_noise_pred_uncond + source_guidance_scale * (
-                source_noise_pred_text - source_noise_pred_uncond
-            )
+                # perform guidance
+                (
+                    source_noise_pred_uncond,
+                    noise_pred_uncond,
+                    source_noise_pred_text,
+                    noise_pred_text,
+                ) = concat_noise_pred.chunk(4, dim=0)
+                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+                source_noise_pred = source_noise_pred_uncond + source_guidance_scale * (
+                    source_noise_pred_text - source_noise_pred_uncond
+                )
 
-            # Sample source_latents from the posterior distribution.
-            prev_source_latents = posterior_sample(
-                self.scheduler, source_latents, t, clean_latents, generator=generator, **extra_step_kwargs
-            )
-            # Compute noise.
-            noise = compute_noise(
-                self.scheduler, prev_source_latents, source_latents, t, source_noise_pred, **extra_step_kwargs
-            )
-            source_latents = prev_source_latents
+                # Sample source_latents from the posterior distribution.
+                prev_source_latents = posterior_sample(
+                    self.scheduler, source_latents, t, clean_latents, generator=generator, **extra_step_kwargs
+                )
+                # Compute noise.
+                noise = compute_noise(
+                    self.scheduler, prev_source_latents, source_latents, t, source_noise_pred, **extra_step_kwargs
+                )
+                source_latents = prev_source_latents
 
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(
-                noise_pred, t, latents, variance_noise=noise, **extra_step_kwargs
-            ).prev_sample
+                # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(
+                    noise_pred, t, latents, variance_noise=noise, **extra_step_kwargs
+                ).prev_sample
 
-            # call the callback, if provided
-            if callback is not None and i % callback_steps == 0:
-                callback(i, t, latents)
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
 
         # 9. Post-processing
         image = self.decode_latents(latents)

src/diffusers/pipelines/stable_diffusion/pipeline_flax_stable_diffusion.py

@@ -23,6 +23,7 @@ import jax.numpy as jnp
 from flax.core.frozen_dict import FrozenDict
 from flax.jax_utils import unreplicate
 from flax.training.common_utils import shard
+from packaging import version
 from PIL import Image
 from transformers import CLIPFeatureExtractor, CLIPTokenizer, FlaxCLIPTextModel
 
@@ -34,7 +35,7 @@ from ...schedulers import (
     FlaxLMSDiscreteScheduler,
     FlaxPNDMScheduler,
 )
-from ...utils import logging
+from ...utils import deprecate, logging
 from . import FlaxStableDiffusionPipelineOutput
 from .safety_checker_flax import FlaxStableDiffusionSafetyChecker
 
@@ -88,7 +89,7 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
         self.dtype = dtype
 
         if safety_checker is None:
-            logger.warn(
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -97,6 +98,27 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -106,6 +128,7 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
 
     def prepare_inputs(self, prompt: Union[str, List[str]]):
         if not isinstance(prompt, (str, list)):
@@ -160,12 +183,17 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
         params: Union[Dict, FrozenDict],
         prng_seed: jax.random.PRNGKey,
         num_inference_steps: int = 50,
-        height: int = 512,
-        width: int = 512,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
         guidance_scale: float = 7.5,
         latents: Optional[jnp.array] = None,
         debug: bool = False,
+        neg_prompt_ids: jnp.array = None,
     ):
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
+
         if height % 8 != 0 or width % 8 != 0:
             raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
 
@@ -177,13 +205,22 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
         batch_size = prompt_ids.shape[0]
 
         max_length = prompt_ids.shape[-1]
-        uncond_input = self.tokenizer(
-            [""] * batch_size, padding="max_length", max_length=max_length, return_tensors="np"
-        )
-        uncond_embeddings = self.text_encoder(uncond_input.input_ids, params=params["text_encoder"])[0]
+
+        if neg_prompt_ids is None:
+            uncond_input = self.tokenizer(
+                [""] * batch_size, padding="max_length", max_length=max_length, return_tensors="np"
+            ).input_ids
+        else:
+            uncond_input = neg_prompt_ids
+        uncond_embeddings = self.text_encoder(uncond_input, params=params["text_encoder"])[0]
         context = jnp.concatenate([uncond_embeddings, text_embeddings])
 
-        latents_shape = (batch_size, self.unet.in_channels, height // 8, width // 8)
+        latents_shape = (
+            batch_size,
+            self.unet.in_channels,
+            height // self.vae_scale_factor,
+            width // self.vae_scale_factor,
+        )
         if latents is None:
             latents = jax.random.normal(prng_seed, shape=latents_shape, dtype=jnp.float32)
         else:
@@ -244,14 +281,14 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
         params: Union[Dict, FrozenDict],
         prng_seed: jax.random.PRNGKey,
         num_inference_steps: int = 50,
-        height: int = 512,
-        width: int = 512,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
         guidance_scale: float = 7.5,
         latents: jnp.array = None,
         return_dict: bool = True,
         jit: bool = False,
         debug: bool = False,
-        **kwargs,
+        neg_prompt_ids: jnp.array = None,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -259,9 +296,9 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
         Args:
             prompt (`str` or `List[str]`):
                 The prompt or prompts to guide the image generation.
-            height (`int`, *optional*, defaults to 512):
+            height (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The height in pixels of the generated image.
-            width (`int`, *optional*, defaults to 512):
+            width (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The width in pixels of the generated image.
             num_inference_steps (`int`, *optional*, defaults to 50):
                 The number of denoising steps. More denoising steps usually lead to a higher quality image at the
@@ -279,9 +316,6 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
                 Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
                 generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
                 tensor will ge generated by sampling using the supplied random `generator`.
-            output_type (`str`, *optional*, defaults to `"pil"`):
-                The output format of the generate image. Choose between
-                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
             jit (`bool`, defaults to `False`):
                 Whether to run `pmap` versions of the generation and safety scoring functions. NOTE: This argument
                 exists because `__call__` is not yet end-to-end pmap-able. It will be removed in a future release.
@@ -296,13 +330,36 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
             element is a list of `bool`s denoting whether the corresponding generated image likely represents
             "not-safe-for-work" (nsfw) content, according to the `safety_checker`.
         """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
+
         if jit:
             images = _p_generate(
-                self, prompt_ids, params, prng_seed, num_inference_steps, height, width, guidance_scale, latents, debug
+                self,
+                prompt_ids,
+                params,
+                prng_seed,
+                num_inference_steps,
+                height,
+                width,
+                guidance_scale,
+                latents,
+                debug,
+                neg_prompt_ids,
             )
         else:
             images = self._generate(
-                prompt_ids, params, prng_seed, num_inference_steps, height, width, guidance_scale, latents, debug
+                prompt_ids,
+                params,
+                prng_seed,
+                num_inference_steps,
+                height,
+                width,
+                guidance_scale,
+                latents,
+                debug,
+                neg_prompt_ids,
             )
 
         if self.safety_checker is not None:
@@ -322,6 +379,7 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
 
             images = images.reshape(num_devices, batch_size, height, width, 3)
         else:
+            images = np.asarray(images)
             has_nsfw_concept = False
 
         if not return_dict:
@@ -333,10 +391,29 @@ class FlaxStableDiffusionPipeline(FlaxDiffusionPipeline):
 # TODO: maybe use a config dict instead of so many static argnums
 @partial(jax.pmap, static_broadcasted_argnums=(0, 4, 5, 6, 7, 9))
 def _p_generate(
-    pipe, prompt_ids, params, prng_seed, num_inference_steps, height, width, guidance_scale, latents, debug
+    pipe,
+    prompt_ids,
+    params,
+    prng_seed,
+    num_inference_steps,
+    height,
+    width,
+    guidance_scale,
+    latents,
+    debug,
+    neg_prompt_ids,
 ):
     return pipe._generate(
-        prompt_ids, params, prng_seed, num_inference_steps, height, width, guidance_scale, latents, debug
+        prompt_ids,
+        params,
+        prng_seed,
+        num_inference_steps,
+        height,
+        width,
+        guidance_scale,
+        latents,
+        debug,
+        neg_prompt_ids,
     )
 
 

src/diffusers/pipelines/stable_diffusion/pipeline_onnx_stable_diffusion.py

@@ -41,6 +41,8 @@ class OnnxStableDiffusionPipeline(DiffusionPipeline):
     safety_checker: OnnxRuntimeModel
     feature_extractor: CLIPFeatureExtractor
 
+    _optional_components = ["safety_checker", "feature_extractor"]
+
     def __init__(
         self,
         vae_encoder: OnnxRuntimeModel,
@@ -51,6 +53,7 @@ class OnnxStableDiffusionPipeline(DiffusionPipeline):
         scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
         safety_checker: OnnxRuntimeModel,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -81,6 +84,22 @@ class OnnxStableDiffusionPipeline(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
+                f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
+                " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
+                " results in services or applications open to the public. Both the diffusers team and Hugging Face"
+                " strongly recommend to keep the safety filter enabled in all public facing circumstances, disabling"
+                " it only for use-cases that involve analyzing network behavior or auditing its results. For more"
+                " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
+            )
+
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
         self.register_modules(
             vae_encoder=vae_encoder,
             vae_decoder=vae_decoder,
@@ -91,6 +110,7 @@ class OnnxStableDiffusionPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     def _encode_prompt(self, prompt, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
         r"""
@@ -185,7 +205,6 @@ class OnnxStableDiffusionPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         if isinstance(prompt, str):
             batch_size = 1
@@ -261,8 +280,10 @@ class OnnxStableDiffusionPipeline(DiffusionPipeline):
                 noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
             # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, torch.from_numpy(latents), **extra_step_kwargs).prev_sample
-            latents = np.array(latents)
+            scheduler_output = self.scheduler.step(
+                torch.from_numpy(noise_pred), t, torch.from_numpy(latents), **extra_step_kwargs
+            )
+            latents = scheduler_output.prev_sample.numpy()
 
             # call the callback, if provided
             if callback is not None and i % callback_steps == 0:

src/diffusers/pipelines/stable_diffusion/pipeline_onnx_stable_diffusion_img2img.py

@@ -77,6 +77,8 @@ class OnnxStableDiffusionImg2ImgPipeline(DiffusionPipeline):
     safety_checker: OnnxRuntimeModel
     feature_extractor: CLIPFeatureExtractor
 
+    _optional_components = ["safety_checker", "feature_extractor"]
+
     def __init__(
         self,
         vae_encoder: OnnxRuntimeModel,
@@ -87,6 +89,7 @@ class OnnxStableDiffusionImg2ImgPipeline(DiffusionPipeline):
         scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
         safety_checker: OnnxRuntimeModel,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -117,7 +120,7 @@ class OnnxStableDiffusionImg2ImgPipeline(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
+        if safety_checker is None and requires_safety_checker:
             logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
@@ -127,6 +130,12 @@ class OnnxStableDiffusionImg2ImgPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
         self.register_modules(
             vae_encoder=vae_encoder,
             vae_decoder=vae_decoder,
@@ -137,6 +146,7 @@ class OnnxStableDiffusionImg2ImgPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_onnx_stable_diffusion.OnnxStableDiffusionPipeline._encode_prompt
     def _encode_prompt(self, prompt, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
@@ -231,7 +241,6 @@ class OnnxStableDiffusionImg2ImgPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -401,8 +410,10 @@ class OnnxStableDiffusionImg2ImgPipeline(DiffusionPipeline):
                 noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
             # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, torch.from_numpy(latents), **extra_step_kwargs).prev_sample
-            latents = latents.numpy()
+            scheduler_output = self.scheduler.step(
+                torch.from_numpy(noise_pred), t, torch.from_numpy(latents), **extra_step_kwargs
+            )
+            latents = scheduler_output.prev_sample.numpy()
 
             # call the callback, if provided
             if callback is not None and i % callback_steps == 0:

src/diffusers/pipelines/stable_diffusion/pipeline_onnx_stable_diffusion_inpaint.py

@@ -90,6 +90,8 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
     safety_checker: OnnxRuntimeModel
     feature_extractor: CLIPFeatureExtractor
 
+    _optional_components = ["safety_checker", "feature_extractor"]
+
     def __init__(
         self,
         vae_encoder: OnnxRuntimeModel,
@@ -100,6 +102,7 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
         scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
         safety_checker: OnnxRuntimeModel,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
         logger.info("`OnnxStableDiffusionInpaintPipeline` is experimental and will very likely change in the future.")
@@ -131,7 +134,7 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
+        if safety_checker is None and requires_safety_checker:
             logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
@@ -141,6 +144,12 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
         self.register_modules(
             vae_encoder=vae_encoder,
             vae_decoder=vae_decoder,
@@ -151,6 +160,7 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_onnx_stable_diffusion.OnnxStableDiffusionPipeline._encode_prompt
     def _encode_prompt(self, prompt, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
@@ -236,8 +246,8 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
         prompt: Union[str, List[str]],
         image: PIL.Image.Image,
         mask_image: PIL.Image.Image,
-        height: int = 512,
-        width: int = 512,
+        height: Optional[int] = 512,
+        width: Optional[int] = 512,
         num_inference_steps: int = 50,
         guidance_scale: float = 7.5,
         negative_prompt: Optional[Union[str, List[str]]] = None,
@@ -249,7 +259,6 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -312,6 +321,7 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
             list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
             (nsfw) content, according to the `safety_checker`.
         """
+
         if isinstance(prompt, str):
             batch_size = 1
         elif isinstance(prompt, list):
@@ -408,9 +418,9 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
             # expand the latents if we are doing classifier free guidance
             latent_model_input = np.concatenate([latents] * 2) if do_classifier_free_guidance else latents
             # concat latents, mask, masked_image_latnets in the channel dimension
-            latent_model_input = np.concatenate([latent_model_input, mask, masked_image_latents], axis=1)
             latent_model_input = self.scheduler.scale_model_input(torch.from_numpy(latent_model_input), t)
             latent_model_input = latent_model_input.cpu().numpy()
+            latent_model_input = np.concatenate([latent_model_input, mask, masked_image_latents], axis=1)
 
             # predict the noise residual
             timestep = np.array([t], dtype=timestep_dtype)
@@ -424,8 +434,10 @@ class OnnxStableDiffusionInpaintPipeline(DiffusionPipeline):
                 noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
             # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, torch.from_numpy(latents), **extra_step_kwargs).prev_sample
-            latents = latents.numpy()
+            scheduler_output = self.scheduler.step(
+                torch.from_numpy(noise_pred), t, torch.from_numpy(latents), **extra_step_kwargs
+            )
+            latents = scheduler_output.prev_sample.numpy()
 
             # call the callback, if provided
             if callback is not None and i % callback_steps == 0:

src/diffusers/pipelines/stable_diffusion/pipeline_onnx_stable_diffusion_inpaint_legacy.py

@@ -0,0 +1,456 @@
+import inspect
+from typing import Callable, List, Optional, Union
+
+import numpy as np
+import torch
+
+import PIL
+from transformers import CLIPFeatureExtractor, CLIPTokenizer
+
+from ...configuration_utils import FrozenDict
+from ...onnx_utils import OnnxRuntimeModel
+from ...pipeline_utils import DiffusionPipeline
+from ...schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
+from ...utils import deprecate, logging
+from . import StableDiffusionPipelineOutput
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+def preprocess(image):
+    w, h = image.size
+    w, h = map(lambda x: x - x % 32, (w, h))  # resize to integer multiple of 32
+    image = image.resize((w, h), resample=PIL.Image.LANCZOS)
+    image = np.array(image).astype(np.float32) / 255.0
+    image = image[None].transpose(0, 3, 1, 2)
+    return 2.0 * image - 1.0
+
+
+def preprocess_mask(mask, scale_factor=8):
+    mask = mask.convert("L")
+    w, h = mask.size
+    w, h = map(lambda x: x - x % 32, (w, h))  # resize to integer multiple of 32
+    mask = mask.resize((w // scale_factor, h // scale_factor), resample=PIL.Image.NEAREST)
+    mask = np.array(mask).astype(np.float32) / 255.0
+    mask = np.tile(mask, (4, 1, 1))
+    mask = mask[None].transpose(0, 1, 2, 3)  # what does this step do?
+    mask = 1 - mask  # repaint white, keep black
+    return mask
+
+
+class OnnxStableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
+    r"""
+    Pipeline for text-guided image inpainting using Stable Diffusion. This is a *legacy feature* for Onnx pipelines to
+    provide compatibility with StableDiffusionInpaintPipelineLegacy and may be removed in the future.
+
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Args:
+        vae ([`AutoencoderKL`]):
+            Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
+        text_encoder ([`CLIPTextModel`]):
+            Frozen text-encoder. Stable Diffusion uses the text portion of
+            [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically
+            the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
+        tokenizer (`CLIPTokenizer`):
+            Tokenizer of class
+            [CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+        safety_checker ([`StableDiffusionSafetyChecker`]):
+            Classification module that estimates whether generated images could be considered offensive or harmful.
+            Please, refer to the [model card](https://huggingface.co/runwayml/stable-diffusion-v1-5) for details.
+        feature_extractor ([`CLIPFeatureExtractor`]):
+            Model that extracts features from generated images to be used as inputs for the `safety_checker`.
+    """
+    _optional_components = ["safety_checker", "feature_extractor"]
+
+    vae_encoder: OnnxRuntimeModel
+    vae_decoder: OnnxRuntimeModel
+    text_encoder: OnnxRuntimeModel
+    tokenizer: CLIPTokenizer
+    unet: OnnxRuntimeModel
+    scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler]
+    safety_checker: OnnxRuntimeModel
+    feature_extractor: CLIPFeatureExtractor
+
+    def __init__(
+        self,
+        vae_encoder: OnnxRuntimeModel,
+        vae_decoder: OnnxRuntimeModel,
+        text_encoder: OnnxRuntimeModel,
+        tokenizer: CLIPTokenizer,
+        unet: OnnxRuntimeModel,
+        scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
+        safety_checker: OnnxRuntimeModel,
+        feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
+    ):
+        super().__init__()
+
+        if hasattr(scheduler.config, "steps_offset") and scheduler.config.steps_offset != 1:
+            deprecation_message = (
+                f"The configuration file of this scheduler: {scheduler} is outdated. `steps_offset`"
+                f" should be set to 1 instead of {scheduler.config.steps_offset}. Please make sure "
+                "to update the config accordingly as leaving `steps_offset` might led to incorrect results"
+                " in future versions. If you have downloaded this checkpoint from the Hugging Face Hub,"
+                " it would be very nice if you could open a Pull request for the `scheduler/scheduler_config.json`"
+                " file"
+            )
+            deprecate("steps_offset!=1", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(scheduler.config)
+            new_config["steps_offset"] = 1
+            scheduler._internal_dict = FrozenDict(new_config)
+
+        if hasattr(scheduler.config, "clip_sample") and scheduler.config.clip_sample is True:
+            deprecation_message = (
+                f"The configuration file of this scheduler: {scheduler} has not set the configuration `clip_sample`."
+                " `clip_sample` should be set to False in the configuration file. Please make sure to update the"
+                " config accordingly as not setting `clip_sample` in the config might lead to incorrect results in"
+                " future versions. If you have downloaded this checkpoint from the Hugging Face Hub, it would be very"
+                " nice if you could open a Pull request for the `scheduler/scheduler_config.json` file"
+            )
+            deprecate("clip_sample not set", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(scheduler.config)
+            new_config["clip_sample"] = False
+            scheduler._internal_dict = FrozenDict(new_config)
+
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
+                f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
+                " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
+                " results in services or applications open to the public. Both the diffusers team and Hugging Face"
+                " strongly recommend to keep the safety filter enabled in all public facing circumstances, disabling"
+                " it only for use-cases that involve analyzing network behavior or auditing its results. For more"
+                " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
+            )
+
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        self.register_modules(
+            vae_encoder=vae_encoder,
+            vae_decoder=vae_decoder,
+            text_encoder=text_encoder,
+            tokenizer=tokenizer,
+            unet=unet,
+            scheduler=scheduler,
+            safety_checker=safety_checker,
+            feature_extractor=feature_extractor,
+        )
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_onnx_stable_diffusion.OnnxStableDiffusionPipeline._encode_prompt
+    def _encode_prompt(self, prompt, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+            negative_prompt (`str` or `List[str]`):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+        """
+        batch_size = len(prompt) if isinstance(prompt, list) else 1
+
+        # get prompt text embeddings
+        text_inputs = self.tokenizer(
+            prompt,
+            padding="max_length",
+            max_length=self.tokenizer.model_max_length,
+            truncation=True,
+            return_tensors="np",
+        )
+        text_input_ids = text_inputs.input_ids
+        untruncated_ids = self.tokenizer(prompt, padding="max_length", return_tensors="np").input_ids
+
+        if not np.array_equal(text_input_ids, untruncated_ids):
+            removed_text = self.tokenizer.batch_decode(untruncated_ids[:, self.tokenizer.model_max_length - 1 : -1])
+            logger.warning(
+                "The following part of your input was truncated because CLIP can only handle sequences up to"
+                f" {self.tokenizer.model_max_length} tokens: {removed_text}"
+            )
+
+        text_embeddings = self.text_encoder(input_ids=text_input_ids.astype(np.int32))[0]
+        text_embeddings = np.repeat(text_embeddings, num_images_per_prompt, axis=0)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_tokens: List[str]
+            if negative_prompt is None:
+                uncond_tokens = [""] * batch_size
+            elif type(prompt) is not type(negative_prompt):
+                raise TypeError(
+                    f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
+                    f" {type(prompt)}."
+                )
+            elif isinstance(negative_prompt, str):
+                uncond_tokens = [negative_prompt] * batch_size
+            elif batch_size != len(negative_prompt):
+                raise ValueError(
+                    f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:"
+                    f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches"
+                    " the batch size of `prompt`."
+                )
+            else:
+                uncond_tokens = negative_prompt
+
+            max_length = text_input_ids.shape[-1]
+            uncond_input = self.tokenizer(
+                uncond_tokens,
+                padding="max_length",
+                max_length=max_length,
+                truncation=True,
+                return_tensors="np",
+            )
+            uncond_embeddings = self.text_encoder(input_ids=uncond_input.input_ids.astype(np.int32))[0]
+            uncond_embeddings = np.repeat(uncond_embeddings, num_images_per_prompt, axis=0)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and text embeddings into a single batch
+            # to avoid doing two forward passes
+            text_embeddings = np.concatenate([uncond_embeddings, text_embeddings])
+
+        return text_embeddings
+
+    def __call__(
+        self,
+        prompt: Union[str, List[str]],
+        init_image: Union[np.ndarray, PIL.Image.Image],
+        mask_image: Union[np.ndarray, PIL.Image.Image],
+        strength: float = 0.8,
+        num_inference_steps: Optional[int] = 50,
+        guidance_scale: Optional[float] = 7.5,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: Optional[float] = 0.0,
+        generator: Optional[np.random.RandomState] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
+        callback_steps: Optional[int] = 1,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            init_image (`nd.ndarray` or `PIL.Image.Image`):
+                `Image`, or tensor representing an image batch, that will be used as the starting point for the
+                process. This is the image whose masked region will be inpainted.
+            mask_image (`nd.ndarray` or `PIL.Image.Image`):
+                `Image`, or tensor representing an image batch, to mask `init_image`. White pixels in the mask will be
+                replaced by noise and therefore repainted, while black pixels will be preserved. If `mask_image` is a
+                PIL image, it will be converted to a single channel (luminance) before use. If it's a tensor, it should
+                contain one color channel (L) instead of 3, so the expected shape would be `(B, H, W, 1)`.uu
+            strength (`float`, *optional*, defaults to 0.8):
+                Conceptually, indicates how much to transform the reference `init_image`. Must be between 0 and 1.
+                `init_image` will be used as a starting point, adding more noise to it the larger the `strength`. The
+                number of denoising steps depends on the amount of noise initially added. When `strength` is 1, added
+                noise will be maximum and the denoising process will run for the full number of iterations specified in
+                `num_inference_steps`. A value of 1, therefore, essentially ignores `init_image`.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference. This parameter will be modulated by `strength`.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (?) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`np.random.RandomState`, *optional*):
+                A np.random.RandomState to make generation deterministic.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: np.ndarray)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+        if isinstance(prompt, str):
+            batch_size = 1
+        elif isinstance(prompt, list):
+            batch_size = len(prompt)
+        else:
+            raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
+
+        if strength < 0 or strength > 1:
+            raise ValueError(f"The value of strength should in [0.0, 1.0] but is {strength}")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+        if generator is None:
+            generator = np.random
+
+        # set timesteps
+        self.scheduler.set_timesteps(num_inference_steps)
+
+        if isinstance(init_image, PIL.Image.Image):
+            init_image = preprocess(init_image)
+
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        text_embeddings = self._encode_prompt(
+            prompt, num_images_per_prompt, do_classifier_free_guidance, negative_prompt
+        )
+
+        latents_dtype = text_embeddings.dtype
+        init_image = init_image.astype(latents_dtype)
+
+        # encode the init image into latents and scale the latents
+        init_latents = self.vae_encoder(sample=init_image)[0]
+        init_latents = 0.18215 * init_latents
+
+        # Expand init_latents for batch_size and num_images_per_prompt
+        init_latents = np.concatenate([init_latents] * num_images_per_prompt, axis=0)
+        init_latents_orig = init_latents
+
+        # preprocess mask
+        if not isinstance(mask_image, np.ndarray):
+            mask_image = preprocess_mask(mask_image, 8)
+        mask_image = mask_image.astype(latents_dtype)
+        mask = np.concatenate([mask_image] * num_images_per_prompt, axis=0)
+
+        # check sizes
+        if not mask.shape == init_latents.shape:
+            raise ValueError("The mask and init_image should be the same size!")
+
+        # get the original timestep using init_timestep
+        offset = self.scheduler.config.get("steps_offset", 0)
+        init_timestep = int(num_inference_steps * strength) + offset
+        init_timestep = min(init_timestep, num_inference_steps)
+
+        timesteps = self.scheduler.timesteps.numpy()[-init_timestep]
+        timesteps = np.array([timesteps] * batch_size * num_images_per_prompt)
+
+        # add noise to latents using the timesteps
+        noise = generator.randn(*init_latents.shape).astype(latents_dtype)
+        init_latents = self.scheduler.add_noise(
+            torch.from_numpy(init_latents), torch.from_numpy(noise), torch.from_numpy(timesteps)
+        )
+        init_latents = init_latents.numpy()
+
+        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
+        # eta (?) is only used with the DDIMScheduler, it will be ignored for other schedulers.
+        # eta corresponds to ? in DDIM paper: https://arxiv.org/abs/2010.02502
+        # and should be between [0, 1]
+        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        extra_step_kwargs = {}
+        if accepts_eta:
+            extra_step_kwargs["eta"] = eta
+
+        latents = init_latents
+
+        t_start = max(num_inference_steps - init_timestep + offset, 0)
+        timesteps = self.scheduler.timesteps[t_start:].numpy()
+
+        for i, t in enumerate(self.progress_bar(timesteps)):
+            # expand the latents if we are doing classifier free guidance
+            latent_model_input = np.concatenate([latents] * 2) if do_classifier_free_guidance else latents
+            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+
+            # predict the noise residual
+            noise_pred = self.unet(
+                sample=latent_model_input, timestep=np.array([t]), encoder_hidden_states=text_embeddings
+            )[0]
+
+            # perform guidance
+            if do_classifier_free_guidance:
+                noise_pred_uncond, noise_pred_text = np.split(noise_pred, 2)
+                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+
+            # compute the previous noisy sample x_t -> x_t-1
+            latents = self.scheduler.step(
+                torch.from_numpy(noise_pred), t, torch.from_numpy(latents), **extra_step_kwargs
+            ).prev_sample
+
+            latents = latents.numpy()
+
+            init_latents_proper = self.scheduler.add_noise(
+                torch.from_numpy(init_latents_orig), torch.from_numpy(noise), torch.from_numpy(np.array([t]))
+            )
+
+            init_latents_proper = init_latents_proper.numpy()
+
+            latents = (init_latents_proper * mask) + (latents * (1 - mask))
+
+            # call the callback, if provided
+            if callback is not None and i % callback_steps == 0:
+                callback(i, t, latents)
+
+        latents = 1 / 0.18215 * latents
+        # image = self.vae_decoder(latent_sample=latents)[0]
+        # it seems likes there is a strange result for using half-precision vae decoder if batchsize>1
+        image = np.concatenate(
+            [self.vae_decoder(latent_sample=latents[i : i + 1])[0] for i in range(latents.shape[0])]
+        )
+
+        image = np.clip(image / 2 + 0.5, 0, 1)
+        image = image.transpose((0, 2, 3, 1))
+
+        if self.safety_checker is not None:
+            safety_checker_input = self.feature_extractor(
+                self.numpy_to_pil(image), return_tensors="np"
+            ).pixel_values.astype(image.dtype)
+            # There will throw an error if use safety_checker batchsize>1
+            images, has_nsfw_concept = [], []
+            for i in range(image.shape[0]):
+                image_i, has_nsfw_concept_i = self.safety_checker(
+                    clip_input=safety_checker_input[i : i + 1], images=image[i : i + 1]
+                )
+                images.append(image_i)
+                has_nsfw_concept.append(has_nsfw_concept_i[0])
+            image = np.concatenate(images)
+        else:
+            has_nsfw_concept = None
+
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image, has_nsfw_concept)
+
+        return StableDiffusionPipelineOutput(images=image, nsfw_content_detected=has_nsfw_concept)

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py

@@ -18,6 +18,7 @@ from typing import Callable, List, Optional, Union
 import torch
 
 from diffusers.utils import is_accelerate_available
+from packaging import version
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 from ...configuration_utils import FrozenDict
@@ -66,6 +67,7 @@ class StableDiffusionPipeline(DiffusionPipeline):
         feature_extractor ([`CLIPFeatureExtractor`]):
             Model that extracts features from generated images to be used as inputs for the `safety_checker`.
     """
+    _optional_components = ["safety_checker", "feature_extractor"]
 
     def __init__(
         self,
@@ -83,6 +85,7 @@ class StableDiffusionPipeline(DiffusionPipeline):
         ],
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -113,8 +116,8 @@ class StableDiffusionPipeline(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
-            logger.warn(
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -123,6 +126,33 @@ class StableDiffusionPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -132,6 +162,8 @@ class StableDiffusionPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     def enable_xformers_memory_efficient_attention(self):
         r"""
@@ -165,9 +197,14 @@ class StableDiffusionPipeline(DiffusionPipeline):
                 `attention_head_dim` must be a multiple of `slice_size`.
         """
         if slice_size == "auto":
-            # half the attention head size is usually a good trade-off between
-            # speed and memory
-            slice_size = self.unet.config.attention_head_dim // 2
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
         self.unet.set_attention_slice(slice_size)
 
     def disable_attention_slicing(self):
@@ -178,6 +215,22 @@ class StableDiffusionPipeline(DiffusionPipeline):
         # set slice_size = `None` to disable `attention slicing`
         self.enable_attention_slicing(None)
 
+    def enable_vae_slicing(self):
+        r"""
+        Enable sliced VAE decoding.
+
+        When this option is enabled, the VAE will split the input tensor in slices to compute decoding in several
+        steps. This is useful to save some memory and allow larger batch sizes.
+        """
+        self.vae.enable_slicing()
+
+    def disable_vae_slicing(self):
+        r"""
+        Disable sliced VAE decoding. If `enable_vae_slicing` was previously invoked, this method will go back to
+        computing decoding in one step.
+        """
+        self.vae.disable_slicing()
+
     def enable_sequential_cpu_offload(self, gpu_id=0):
         r"""
         Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
@@ -191,10 +244,15 @@ class StableDiffusionPipeline(DiffusionPipeline):
 
         device = torch.device(f"cuda:{gpu_id}")
 
-        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae]:
             if cpu_offloaded_model is not None:
                 cpu_offload(cpu_offloaded_model, device)
 
+        if self.safety_checker is not None:
+            # TODO(Patrick) - there is currently a bug with cpu offload of nn.Parameter in accelerate
+            # fix by only offloading self.safety_checker for now
+            cpu_offload(self.safety_checker.vision_model, device)
+
     @property
     def _execution_device(self):
         r"""
@@ -369,7 +427,7 @@ class StableDiffusionPipeline(DiffusionPipeline):
             )
 
     def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
-        shape = (batch_size, num_channels_latents, height // 8, width // 8)
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
         if latents is None:
             if device.type == "mps":
                 # randn does not work reproducibly on mps
@@ -389,8 +447,8 @@ class StableDiffusionPipeline(DiffusionPipeline):
     def __call__(
         self,
         prompt: Union[str, List[str]],
-        height: int = 512,
-        width: int = 512,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
         num_inference_steps: int = 50,
         guidance_scale: float = 7.5,
         negative_prompt: Optional[Union[str, List[str]]] = None,
@@ -402,7 +460,6 @@ class StableDiffusionPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -410,9 +467,9 @@ class StableDiffusionPipeline(DiffusionPipeline):
         Args:
             prompt (`str` or `List[str]`):
                 The prompt or prompts to guide the image generation.
-            height (`int`, *optional*, defaults to 512):
+            height (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The height in pixels of the generated image.
-            width (`int`, *optional*, defaults to 512):
+            width (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The width in pixels of the generated image.
             num_inference_steps (`int`, *optional*, defaults to 50):
                 The number of denoising steps. More denoising steps usually lead to a higher quality image at the
@@ -458,6 +515,9 @@ class StableDiffusionPipeline(DiffusionPipeline):
             list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
             (nsfw) content, according to the `safety_checker`.
         """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
 
         # 1. Check inputs. Raise error if not correct
         self.check_inputs(prompt, height, width, callback_steps)
@@ -496,40 +556,39 @@ class StableDiffusionPipeline(DiffusionPipeline):
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
         # 7. Denoising loop
-        for i, t in enumerate(self.progress_bar(timesteps)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
 
-            # predict the noise residual
-            noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
 
-            # perform guidance
-            if do_classifier_free_guidance:
-                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
-                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+                    # compute the previous noisy sample x_t -> x_t-1
+                    latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
 
-            # call the callback, if provided
-            if callback is not None and i % callback_steps == 0:
-                callback(i, t, latents)
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
 
-        if output_type == "latents":
-            # Skip safety checking if we are returning latents
-            image = latents
-            has_nsfw_concept = None
-        else:
-            # 8. Post-processing
-            image = self.decode_latents(latents)
+        # 8. Post-processing
+        image = self.decode_latents(latents)
 
-            # 9. Run safety checker
-            image, has_nsfw_concept = self.run_safety_checker(image, device, text_embeddings.dtype)
+        # 9. Run safety checker
+        image, has_nsfw_concept = self.run_safety_checker(image, device, text_embeddings.dtype)
 
-            # 10. Convert to PIL
-            if output_type == "pil":
-                image = self.numpy_to_pil(image)
+        # 10. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
 
         if not return_dict:
             return (image, has_nsfw_concept)

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_image_variation.py

@@ -0,0 +1,481 @@
+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import inspect
+from typing import Callable, List, Optional, Union
+
+import torch
+
+import PIL
+from diffusers.utils import is_accelerate_available
+from packaging import version
+from transformers import CLIPFeatureExtractor, CLIPVisionModelWithProjection
+
+from ...configuration_utils import FrozenDict
+from ...models import AutoencoderKL, UNet2DConditionModel
+from ...pipeline_utils import DiffusionPipeline
+from ...schedulers import (
+    DDIMScheduler,
+    DPMSolverMultistepScheduler,
+    EulerAncestralDiscreteScheduler,
+    EulerDiscreteScheduler,
+    LMSDiscreteScheduler,
+    PNDMScheduler,
+)
+from ...utils import deprecate, logging
+from . import StableDiffusionPipelineOutput
+from .safety_checker import StableDiffusionSafetyChecker
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+class StableDiffusionImageVariationPipeline(DiffusionPipeline):
+    r"""
+    Pipeline to generate variations from an input image using Stable Diffusion.
+
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Args:
+        vae ([`AutoencoderKL`]):
+            Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
+        image_encoder ([`CLIPVisionModelWithProjection`]):
+            Frozen CLIP image-encoder. Stable Diffusion Image Variation uses the vision portion of
+            [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPVisionModelWithProjection),
+            specifically the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+        safety_checker ([`StableDiffusionSafetyChecker`]):
+            Classification module that estimates whether generated images could be considered offensive or harmful.
+            Please, refer to the [model card](https://huggingface.co/runwayml/stable-diffusion-v1-5) for details.
+        feature_extractor ([`CLIPFeatureExtractor`]):
+            Model that extracts features from generated images to be used as inputs for the `safety_checker`.
+    """
+    _optional_components = ["safety_checker", "feature_extractor"]
+
+    def __init__(
+        self,
+        vae: AutoencoderKL,
+        image_encoder: CLIPVisionModelWithProjection,
+        unet: UNet2DConditionModel,
+        scheduler: Union[
+            DDIMScheduler,
+            PNDMScheduler,
+            LMSDiscreteScheduler,
+            EulerDiscreteScheduler,
+            EulerAncestralDiscreteScheduler,
+            DPMSolverMultistepScheduler,
+        ],
+        safety_checker: StableDiffusionSafetyChecker,
+        feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
+    ):
+        super().__init__()
+
+        if safety_checker is None and requires_safety_checker:
+            logger.warn(
+                f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
+                " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
+                " results in services or applications open to the public. Both the diffusers team and Hugging Face"
+                " strongly recommend to keep the safety filter enabled in all public facing circumstances, disabling"
+                " it only for use-cases that involve analyzing network behavior or auditing its results. For more"
+                " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
+            )
+
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
+        self.register_modules(
+            vae=vae,
+            image_encoder=image_encoder,
+            unet=unet,
+            scheduler=scheduler,
+            safety_checker=safety_checker,
+            feature_extractor=feature_extractor,
+        )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_xformers_memory_efficient_attention
+    def enable_xformers_memory_efficient_attention(self):
+        r"""
+        Enable memory efficient attention as implemented in xformers.
+
+        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
+        time. Speed up at training time is not guaranteed.
+
+        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
+        is used.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(True)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_xformers_memory_efficient_attention
+    def disable_xformers_memory_efficient_attention(self):
+        r"""
+        Disable memory efficient attention as implemented in xformers.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(False)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
+        self.unet.set_attention_slice(slice_size)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    def enable_sequential_cpu_offload(self, gpu_id=0):
+        r"""
+        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
+        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
+        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
+        """
+        if is_accelerate_available():
+            from accelerate import cpu_offload
+        else:
+            raise ImportError("Please install accelerate via `pip install accelerate`")
+
+        device = torch.device(f"cuda:{gpu_id}")
+
+        for cpu_offloaded_model in [self.unet, self.image_encoder, self.vae, self.safety_checker]:
+            if cpu_offloaded_model is not None:
+                cpu_offload(cpu_offloaded_model, device)
+
+    @property
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device
+    def _execution_device(self):
+        r"""
+        Returns the device on which the pipeline's models will be executed. After calling
+        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
+        hooks.
+        """
+        if self.device != torch.device("meta") or not hasattr(self.unet, "_hf_hook"):
+            return self.device
+        for module in self.unet.modules():
+            if (
+                hasattr(module, "_hf_hook")
+                and hasattr(module._hf_hook, "execution_device")
+                and module._hf_hook.execution_device is not None
+            ):
+                return torch.device(module._hf_hook.execution_device)
+        return self.device
+
+    def _encode_image(self, image, device, num_images_per_prompt, do_classifier_free_guidance):
+        dtype = next(self.image_encoder.parameters()).dtype
+
+        if not isinstance(image, torch.Tensor):
+            image = self.feature_extractor(images=image, return_tensors="pt").pixel_values
+
+        image = image.to(device=device, dtype=dtype)
+        image_embeddings = self.image_encoder(image).image_embeds
+        image_embeddings = image_embeddings.unsqueeze(1)
+
+        # duplicate image embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = image_embeddings.shape
+        image_embeddings = image_embeddings.repeat(1, num_images_per_prompt, 1)
+        image_embeddings = image_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        if do_classifier_free_guidance:
+            uncond_embeddings = torch.zeros_like(image_embeddings)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and text embeddings into a single batch
+            # to avoid doing two forward passes
+            image_embeddings = torch.cat([uncond_embeddings, image_embeddings])
+
+        return image_embeddings
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.run_safety_checker
+    def run_safety_checker(self, image, device, dtype):
+        if self.safety_checker is not None:
+            safety_checker_input = self.feature_extractor(self.numpy_to_pil(image), return_tensors="pt").to(device)
+            image, has_nsfw_concept = self.safety_checker(
+                images=image, clip_input=safety_checker_input.pixel_values.to(dtype)
+            )
+        else:
+            has_nsfw_concept = None
+        return image, has_nsfw_concept
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.decode_latents
+    def decode_latents(self, latents):
+        latents = 1 / 0.18215 * latents
+        image = self.vae.decode(latents).sample
+        image = (image / 2 + 0.5).clamp(0, 1)
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
+        return image
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_extra_step_kwargs
+    def prepare_extra_step_kwargs(self, generator, eta):
+        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
+        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
+        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
+        # and should be between [0, 1]
+
+        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        extra_step_kwargs = {}
+        if accepts_eta:
+            extra_step_kwargs["eta"] = eta
+
+        # check if the scheduler accepts generator
+        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        if accepts_generator:
+            extra_step_kwargs["generator"] = generator
+        return extra_step_kwargs
+
+    def check_inputs(self, image, height, width, callback_steps):
+        if (
+            not isinstance(image, torch.Tensor)
+            and not isinstance(image, PIL.Image.Image)
+            and not isinstance(image, list)
+        ):
+            raise ValueError(
+                f"`image` has to be of type `torch.FloatTensor` or `PIL.Image.Image` or `list` but is {type(image)}"
+            )
+
+        if height % 8 != 0 or width % 8 != 0:
+            raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_latents
+    def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
+        if latents is None:
+            if device.type == "mps":
+                # randn does not work reproducibly on mps
+                latents = torch.randn(shape, generator=generator, device="cpu", dtype=dtype).to(device)
+            else:
+                latents = torch.randn(shape, generator=generator, device=device, dtype=dtype)
+        else:
+            if latents.shape != shape:
+                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {shape}")
+            latents = latents.to(device)
+
+        # scale the initial noise by the standard deviation required by the scheduler
+        latents = latents * self.scheduler.init_noise_sigma
+        return latents
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        image: Union[PIL.Image.Image, List[PIL.Image.Image], torch.FloatTensor],
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            image (`PIL.Image.Image` or `List[PIL.Image.Image]` or `torch.FloatTensor`):
+                The image or images to guide the image generation. If you provide a tensor, it needs to comply with the
+                configuration of
+                [this](https://huggingface.co/lambdalabs/sd-image-variations-diffusers/blob/main/feature_extractor/preprocessor_config.json)
+                `CLIPFeatureExtractor`
+            height (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
+
+        # 1. Check inputs. Raise error if not correct
+        self.check_inputs(image, height, width, callback_steps)
+
+        # 2. Define call parameters
+        if isinstance(image, PIL.Image.Image):
+            batch_size = 1
+        elif isinstance(image, list):
+            batch_size = len(image)
+        else:
+            batch_size = image.shape[0]
+        device = self._execution_device
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        # 3. Encode input image
+        image_embeddings = self._encode_image(image, device, num_images_per_prompt, do_classifier_free_guidance)
+
+        # 4. Prepare timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=device)
+        timesteps = self.scheduler.timesteps
+
+        # 5. Prepare latent variables
+        num_channels_latents = self.unet.in_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            image_embeddings.dtype,
+            device,
+            generator,
+            latents,
+        )
+
+        # 6. Prepare extra step kwargs. TODO: Logic should ideally just be moved out of the pipeline
+        extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
+
+        # 7. Denoising loop
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=image_embeddings).sample
+
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+
+                # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
+
+        # 8. Post-processing
+        image = self.decode_latents(latents)
+
+        # 9. Run safety checker
+        image, has_nsfw_concept = self.run_safety_checker(image, device, image_embeddings.dtype)
+
+        # 10. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image, has_nsfw_concept)
+
+        return StableDiffusionPipelineOutput(images=image, nsfw_content_detected=has_nsfw_concept)

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_img2img.py

@@ -20,6 +20,7 @@ import torch
 
 import PIL
 from diffusers.utils import is_accelerate_available
+from packaging import version
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 from ...configuration_utils import FrozenDict
@@ -78,6 +79,7 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         feature_extractor ([`CLIPFeatureExtractor`]):
             Model that extracts features from generated images to be used as inputs for the `safety_checker`.
     """
+    _optional_components = ["safety_checker", "feature_extractor"]
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.__init__
     def __init__(
@@ -96,6 +98,7 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         ],
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -126,8 +129,8 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
-            logger.warn(
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -136,6 +139,33 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -145,6 +175,8 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing
     def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
@@ -161,9 +193,14 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
                 `attention_head_dim` must be a multiple of `slice_size`.
         """
         if slice_size == "auto":
-            # half the attention head size is usually a good trade-off between
-            # speed and memory
-            slice_size = self.unet.config.attention_head_dim // 2
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
         self.unet.set_attention_slice(slice_size)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
@@ -176,7 +213,7 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         self.enable_attention_slicing(None)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_sequential_cpu_offload
-    def enable_sequential_cpu_offload(self):
+    def enable_sequential_cpu_offload(self, gpu_id=0):
         r"""
         Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
         text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
@@ -187,12 +224,17 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         else:
             raise ImportError("Please install accelerate via `pip install accelerate`")
 
-        device = torch.device("cuda")
+        device = torch.device(f"cuda:{gpu_id}")
 
-        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae]:
             if cpu_offloaded_model is not None:
                 cpu_offload(cpu_offloaded_model, device)
 
+        if self.safety_checker is not None:
+            # TODO(Patrick) - there is currently a bug with cpu offload of nn.Parameter in accelerate
+            # fix by only offloading self.safety_checker for now
+            cpu_offload(self.safety_checker.vision_model, device)
+
     @property
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device
     def _execution_device(self):
@@ -400,7 +442,7 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         t_start = max(num_inference_steps - init_timestep + offset, 0)
         timesteps = self.scheduler.timesteps[t_start:]
 
-        return timesteps
+        return timesteps, num_inference_steps - t_start
 
     def prepare_latents(self, init_image, timestep, batch_size, num_images_per_prompt, dtype, device, generator=None):
         init_image = init_image.to(device=device, dtype=dtype)
@@ -451,7 +493,6 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -530,7 +571,7 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
 
         # 5. set timesteps
         self.scheduler.set_timesteps(num_inference_steps, device=device)
-        timesteps = self.get_timesteps(num_inference_steps, strength, device)
+        timesteps, num_inference_steps = self.get_timesteps(num_inference_steps, strength, device)
         latent_timestep = timesteps[:1].repeat(batch_size * num_images_per_prompt)
 
         # 6. Prepare latent variables
@@ -542,25 +583,29 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
         # 8. Denoising loop
-        for i, t in enumerate(self.progress_bar(timesteps)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
 
-            # predict the noise residual
-            noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
 
-            # perform guidance
-            if do_classifier_free_guidance:
-                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
-                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+                # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
 
-            # call the callback, if provided
-            if callback is not None and i % callback_steps == 0:
-                callback(i, t, latents)
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
 
         # 9. Post-processing
         image = self.decode_latents(latents)

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_inpaint.py

@@ -20,6 +20,7 @@ import torch
 
 import PIL
 from diffusers.utils import is_accelerate_available
+from packaging import version
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 from ...configuration_utils import FrozenDict
@@ -35,16 +36,88 @@ logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
 
 
 def prepare_mask_and_masked_image(image, mask):
-    image = np.array(image.convert("RGB"))
-    image = image[None].transpose(0, 3, 1, 2)
-    image = torch.from_numpy(image).to(dtype=torch.float32) / 127.5 - 1.0
+    """
+    Prepares a pair (image, mask) to be consumed by the Stable Diffusion pipeline. This means that those inputs will be
+    converted to ``torch.Tensor`` with shapes ``batch x channels x height x width`` where ``channels`` is ``3`` for the
+    ``image`` and ``1`` for the ``mask``.
 
-    mask = np.array(mask.convert("L"))
-    mask = mask.astype(np.float32) / 255.0
-    mask = mask[None, None]
-    mask[mask < 0.5] = 0
-    mask[mask >= 0.5] = 1
-    mask = torch.from_numpy(mask)
+    The ``image`` will be converted to ``torch.float32`` and normalized to be in ``[-1, 1]``. The ``mask`` will be
+    binarized (``mask > 0.5``) and cast to ``torch.float32`` too.
+
+    Args:
+        image (Union[np.array, PIL.Image, torch.Tensor]): The image to inpaint.
+            It can be a ``PIL.Image``, or a ``height x width x 3`` ``np.array`` or a ``channels x height x width``
+            ``torch.Tensor`` or a ``batch x channels x height x width`` ``torch.Tensor``.
+        mask (_type_): The mask to apply to the image, i.e. regions to inpaint.
+            It can be a ``PIL.Image``, or a ``height x width`` ``np.array`` or a ``1 x height x width``
+            ``torch.Tensor`` or a ``batch x 1 x height x width`` ``torch.Tensor``.
+
+
+    Raises:
+        ValueError: ``torch.Tensor`` images should be in the ``[-1, 1]`` range. ValueError: ``torch.Tensor`` mask
+        should be in the ``[0, 1]`` range. ValueError: ``mask`` and ``image`` should have the same spatial dimensions.
+        TypeError: ``mask`` is a ``torch.Tensor`` but ``image`` is not
+            (ot the other way around).
+
+    Returns:
+        tuple[torch.Tensor]: The pair (mask, masked_image) as ``torch.Tensor`` with 4
+            dimensions: ``batch x channels x height x width``.
+    """
+    if isinstance(image, torch.Tensor):
+        if not isinstance(mask, torch.Tensor):
+            raise TypeError(f"`image` is a torch.Tensor but `mask` (type: {type(mask)} is not")
+
+        # Batch single image
+        if image.ndim == 3:
+            assert image.shape[0] == 3, "Image outside a batch should be of shape (3, H, W)"
+            image = image.unsqueeze(0)
+
+        # Batch and add channel dim for single mask
+        if mask.ndim == 2:
+            mask = mask.unsqueeze(0).unsqueeze(0)
+
+        # Batch single mask or add channel dim
+        if mask.ndim == 3:
+            # Single batched mask, no channel dim or single mask not batched but channel dim
+            if mask.shape[0] == 1:
+                mask = mask.unsqueeze(0)
+
+            # Batched masks no channel dim
+            else:
+                mask = mask.unsqueeze(1)
+
+        assert image.ndim == 4 and mask.ndim == 4, "Image and Mask must have 4 dimensions"
+        assert image.shape[-2:] == mask.shape[-2:], "Image and Mask must have the same spatial dimensions"
+        assert image.shape[0] == mask.shape[0], "Image and Mask must have the same batch size"
+
+        # Check image is in [-1, 1]
+        if image.min() < -1 or image.max() > 1:
+            raise ValueError("Image should be in [-1, 1] range")
+
+        # Check mask is in [0, 1]
+        if mask.min() < 0 or mask.max() > 1:
+            raise ValueError("Mask should be in [0, 1] range")
+
+        # Binarize mask
+        mask[mask < 0.5] = 0
+        mask[mask >= 0.5] = 1
+
+        # Image as float32
+        image = image.to(dtype=torch.float32)
+    elif isinstance(mask, torch.Tensor):
+        raise TypeError(f"`mask` is a torch.Tensor but `image` (type: {type(image)} is not")
+    else:
+        if isinstance(image, PIL.Image.Image):
+            image = np.array(image.convert("RGB"))
+        image = image[None].transpose(0, 3, 1, 2)
+        image = torch.from_numpy(image).to(dtype=torch.float32) / 127.5 - 1.0
+        if isinstance(mask, PIL.Image.Image):
+            mask = np.array(mask.convert("L"))
+            mask = mask.astype(np.float32) / 255.0
+        mask = mask[None, None]
+        mask[mask < 0.5] = 0
+        mask[mask >= 0.5] = 1
+        mask = torch.from_numpy(mask)
 
     masked_image = image * (mask < 0.5)
 
@@ -78,6 +151,7 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         feature_extractor ([`CLIPFeatureExtractor`]):
             Model that extracts features from generated images to be used as inputs for the `safety_checker`.
     """
+    _optional_components = ["safety_checker", "feature_extractor"]
 
     def __init__(
         self,
@@ -88,6 +162,7 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -119,8 +194,8 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
             new_config["skip_prk_steps"] = True
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
-            logger.warn(
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -129,6 +204,33 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -138,6 +240,8 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing
     def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
@@ -154,9 +258,14 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
                 `attention_head_dim` must be a multiple of `slice_size`.
         """
         if slice_size == "auto":
-            # half the attention head size is usually a good trade-off between
-            # speed and memory
-            slice_size = self.unet.config.attention_head_dim // 2
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
         self.unet.set_attention_slice(slice_size)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
@@ -169,7 +278,7 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         self.enable_attention_slicing(None)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_sequential_cpu_offload
-    def enable_sequential_cpu_offload(self):
+    def enable_sequential_cpu_offload(self, gpu_id=0):
         r"""
         Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
         text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
@@ -180,12 +289,17 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         else:
             raise ImportError("Please install accelerate via `pip install accelerate`")
 
-        device = torch.device("cuda")
+        device = torch.device(f"cuda:{gpu_id}")
 
-        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae]:
             if cpu_offloaded_model is not None:
                 cpu_offload(cpu_offloaded_model, device)
 
+        if self.safety_checker is not None:
+            # TODO(Patrick) - there is currently a bug with cpu offload of nn.Parameter in accelerate
+            # fix by only offloading self.safety_checker for now
+            cpu_offload(self.safety_checker.vision_model, device)
+
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_xformers_memory_efficient_attention
     def enable_xformers_memory_efficient_attention(self):
         r"""
@@ -387,7 +501,7 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_latents
     def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
-        shape = (batch_size, num_channels_latents, height // 8, width // 8)
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
         if latents is None:
             if device.type == "mps":
                 # randn does not work reproducibly on mps
@@ -409,7 +523,9 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         # resize the mask to latents shape as we concatenate the mask to the latents
         # we do that before converting to dtype to avoid breaking in case we're using cpu_offload
         # and half precision
-        mask = torch.nn.functional.interpolate(mask, size=(height // 8, width // 8))
+        mask = torch.nn.functional.interpolate(
+            mask, size=(height // self.vae_scale_factor, width // self.vae_scale_factor)
+        )
         mask = mask.to(device=device, dtype=dtype)
 
         masked_image = masked_image.to(device=device, dtype=dtype)
@@ -437,8 +553,8 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         prompt: Union[str, List[str]],
         image: Union[torch.FloatTensor, PIL.Image.Image],
         mask_image: Union[torch.FloatTensor, PIL.Image.Image],
-        height: int = 512,
-        width: int = 512,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
         num_inference_steps: int = 50,
         guidance_scale: float = 7.5,
         negative_prompt: Optional[Union[str, List[str]]] = None,
@@ -450,7 +566,6 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -466,9 +581,9 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
                 repainted, while black pixels will be preserved. If `mask_image` is a PIL image, it will be converted
                 to a single channel (luminance) before use. If it's a tensor, it should contain one color channel (L)
                 instead of 3, so the expected shape would be `(B, H, W, 1)`.
-            height (`int`, *optional*, defaults to 512):
+            height (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The height in pixels of the generated image.
-            width (`int`, *optional*, defaults to 512):
+            width (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
                 The width in pixels of the generated image.
             num_inference_steps (`int`, *optional*, defaults to 50):
                 The number of denoising steps. More denoising steps usually lead to a higher quality image at the
@@ -514,6 +629,9 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
             list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
             (nsfw) content, according to the `safety_checker`.
         """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
 
         # 1. Check inputs
         self.check_inputs(prompt, height, width, callback_steps)
@@ -537,7 +655,7 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
 
         # 5. set timesteps
         self.scheduler.set_timesteps(num_inference_steps, device=device)
-        timesteps_tensor = self.scheduler.timesteps
+        timesteps = self.scheduler.timesteps
 
         # 6. Prepare latent variables
         num_channels_latents = self.vae.config.latent_channels
@@ -581,29 +699,32 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
         # 10. Denoising loop
-        for i, t in enumerate(self.progress_bar(timesteps_tensor)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
 
-            # concat latents, mask, masked_image_latents in the channel dimension
-            latent_model_input = torch.cat([latent_model_input, mask, masked_image_latents], dim=1)
+                # concat latents, mask, masked_image_latents in the channel dimension
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+                latent_model_input = torch.cat([latent_model_input, mask, masked_image_latents], dim=1)
 
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
 
-            # predict the noise residual
-            noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
-            # perform guidance
-            if do_classifier_free_guidance:
-                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
-                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+                # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
 
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
-
-            # call the callback, if provided
-            if callback is not None and i % callback_steps == 0:
-                callback(i, t, latents)
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
 
         # 11. Post-processing
         image = self.decode_latents(latents)

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_inpaint_legacy.py

@@ -20,6 +20,7 @@ import torch
 
 import PIL
 from diffusers.utils import is_accelerate_available
+from packaging import version
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
 from ...configuration_utils import FrozenDict
@@ -51,11 +52,11 @@ def preprocess_image(image):
     return 2.0 * image - 1.0
 
 
-def preprocess_mask(mask):
+def preprocess_mask(mask, scale_factor=8):
     mask = mask.convert("L")
     w, h = mask.size
     w, h = map(lambda x: x - x % 32, (w, h))  # resize to integer multiple of 32
-    mask = mask.resize((w // 8, h // 8), resample=PIL_INTERPOLATION["nearest"])
+    mask = mask.resize((w // scale_factor, h // scale_factor), resample=PIL_INTERPOLATION["nearest"])
     mask = np.array(mask).astype(np.float32) / 255.0
     mask = np.tile(mask, (4, 1, 1))
     mask = mask[None].transpose(0, 1, 2, 3)  # what does this step do?
@@ -91,6 +92,7 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
         feature_extractor ([`CLIPFeatureExtractor`]):
             Model that extracts features from generated images to be used as inputs for the `safety_checker`.
     """
+    _optional_components = ["safety_checker", "feature_extractor"]
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.__init__
     def __init__(
@@ -109,6 +111,7 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
         ],
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
     ):
         super().__init__()
 
@@ -139,8 +142,8 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
             new_config["clip_sample"] = False
             scheduler._internal_dict = FrozenDict(new_config)
 
-        if safety_checker is None:
-            logger.warn(
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
                 f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
                 " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
                 " results in services or applications open to the public. Both the diffusers team and Hugging Face"
@@ -149,6 +152,33 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
                 " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
             )
 
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
         self.register_modules(
             vae=vae,
             text_encoder=text_encoder,
@@ -158,6 +188,8 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
             safety_checker=safety_checker,
             feature_extractor=feature_extractor,
         )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing
     def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
@@ -174,9 +206,14 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
                 `attention_head_dim` must be a multiple of `slice_size`.
         """
         if slice_size == "auto":
-            # half the attention head size is usually a good trade-off between
-            # speed and memory
-            slice_size = self.unet.config.attention_head_dim // 2
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
         self.unet.set_attention_slice(slice_size)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
@@ -189,7 +226,7 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
         self.enable_attention_slicing(None)
 
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_sequential_cpu_offload
-    def enable_sequential_cpu_offload(self):
+    def enable_sequential_cpu_offload(self, gpu_id=0):
         r"""
         Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
         text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
@@ -200,12 +237,17 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
         else:
             raise ImportError("Please install accelerate via `pip install accelerate`")
 
-        device = torch.device("cuda")
+        device = torch.device(f"cuda:{gpu_id}")
 
-        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae]:
             if cpu_offloaded_model is not None:
                 cpu_offload(cpu_offloaded_model, device)
 
+        if self.safety_checker is not None:
+            # TODO(Patrick) - there is currently a bug with cpu offload of nn.Parameter in accelerate
+            # fix by only offloading self.safety_checker for now
+            cpu_offload(self.safety_checker.vision_model, device)
+
     # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_xformers_memory_efficient_attention
     def enable_xformers_memory_efficient_attention(self):
         r"""
@@ -415,7 +457,7 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
         t_start = max(num_inference_steps - init_timestep + offset, 0)
         timesteps = self.scheduler.timesteps[t_start:]
 
-        return timesteps
+        return timesteps, num_inference_steps - t_start
 
     def prepare_latents(self, init_image, timestep, batch_size, num_images_per_prompt, dtype, device, generator):
         init_image = init_image.to(device=self.device, dtype=dtype)
@@ -450,7 +492,6 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
         return_dict: bool = True,
         callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
         callback_steps: Optional[int] = 1,
-        **kwargs,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -532,11 +573,11 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
             init_image = preprocess_image(init_image)
 
         if not isinstance(mask_image, torch.FloatTensor):
-            mask_image = preprocess_mask(mask_image)
+            mask_image = preprocess_mask(mask_image, self.vae_scale_factor)
 
         # 5. set timesteps
         self.scheduler.set_timesteps(num_inference_steps, device=device)
-        timesteps = self.get_timesteps(num_inference_steps, strength, device)
+        timesteps, num_inference_steps = self.get_timesteps(num_inference_steps, strength, device)
         latent_timestep = timesteps[:1].repeat(batch_size * num_images_per_prompt)
 
         # 6. Prepare latent variables
@@ -553,29 +594,33 @@ class StableDiffusionInpaintPipelineLegacy(DiffusionPipeline):
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
         # 9. Denoising loop
-        for i, t in enumerate(self.progress_bar(timesteps)):
-            # expand the latents if we are doing classifier free guidance
-            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
 
-            # predict the noise residual
-            noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
 
-            # perform guidance
-            if do_classifier_free_guidance:
-                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
-                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                    noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
 
-            # compute the previous noisy sample x_t -> x_t-1
-            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
-            # masking
-            init_latents_proper = self.scheduler.add_noise(init_latents_orig, noise, torch.tensor([t]))
+                # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+                # masking
+                init_latents_proper = self.scheduler.add_noise(init_latents_orig, noise, torch.tensor([t]))
 
-            latents = (init_latents_proper * mask) + (latents * (1 - mask))
+                latents = (init_latents_proper * mask) + (latents * (1 - mask))
 
-            # call the callback, if provided
-            if callback is not None and i % callback_steps == 0:
-                callback(i, t, latents)
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
 
         # 10. Post-processing
         image = self.decode_latents(latents)

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_upscale.py

@@ -0,0 +1,555 @@
+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import inspect
+from typing import Callable, List, Optional, Union
+
+import numpy as np
+import torch
+
+import PIL
+from diffusers.utils import is_accelerate_available
+from transformers import CLIPTextModel, CLIPTokenizer
+
+from ...models import AutoencoderKL, UNet2DConditionModel
+from ...pipeline_utils import DiffusionPipeline, ImagePipelineOutput
+from ...schedulers import DDIMScheduler, DDPMScheduler, LMSDiscreteScheduler, PNDMScheduler
+from ...utils import logging
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+def preprocess(image):
+    # resize to multiple of 64
+    width, height = image.size
+    width = width - width % 64
+    height = height - height % 64
+    image = image.resize((width, height))
+
+    image = np.array(image.convert("RGB"))
+    image = image[None].transpose(0, 3, 1, 2)
+    image = torch.from_numpy(image).to(dtype=torch.float32) / 127.5 - 1.0
+    return image
+
+
+class StableDiffusionUpscalePipeline(DiffusionPipeline):
+    r"""
+    Pipeline for text-guided image super-resolution using Stable Diffusion 2.
+
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Args:
+        vae ([`AutoencoderKL`]):
+            Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
+        text_encoder ([`CLIPTextModel`]):
+            Frozen text-encoder. Stable Diffusion uses the text portion of
+            [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically
+            the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
+        tokenizer (`CLIPTokenizer`):
+            Tokenizer of class
+            [CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        low_res_scheduler ([`SchedulerMixin`]):
+            A scheduler used to add initial noise to the low res conditioning image. It must be an instance of
+            [`DDPMScheduler`].
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+    """
+
+    def __init__(
+        self,
+        vae: AutoencoderKL,
+        text_encoder: CLIPTextModel,
+        tokenizer: CLIPTokenizer,
+        unet: UNet2DConditionModel,
+        low_res_scheduler: DDPMScheduler,
+        scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
+        max_noise_level: int = 350,
+    ):
+        super().__init__()
+
+        self.register_modules(
+            vae=vae,
+            text_encoder=text_encoder,
+            tokenizer=tokenizer,
+            unet=unet,
+            low_res_scheduler=low_res_scheduler,
+            scheduler=scheduler,
+        )
+        self.register_to_config(max_noise_level=max_noise_level)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            if isinstance(self.unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.unet.config.attention_head_dim)
+
+        self.unet.set_attention_slice(slice_size)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    def enable_sequential_cpu_offload(self, gpu_id=0):
+        r"""
+        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
+        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
+        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
+        """
+        if is_accelerate_available():
+            from accelerate import cpu_offload
+        else:
+            raise ImportError("Please install accelerate via `pip install accelerate`")
+
+        device = torch.device(f"cuda:{gpu_id}")
+
+        for cpu_offloaded_model in [self.unet, self.text_encoder]:
+            if cpu_offloaded_model is not None:
+                cpu_offload(cpu_offloaded_model, device)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_xformers_memory_efficient_attention
+    def enable_xformers_memory_efficient_attention(self):
+        r"""
+        Enable memory efficient attention as implemented in xformers.
+
+        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
+        time. Speed up at training time is not guaranteed.
+
+        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
+        is used.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(True)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_xformers_memory_efficient_attention
+    def disable_xformers_memory_efficient_attention(self):
+        r"""
+        Disable memory efficient attention as implemented in xformers.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(False)
+
+    @property
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device
+    def _execution_device(self):
+        r"""
+        Returns the device on which the pipeline's models will be executed. After calling
+        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
+        hooks.
+        """
+        if self.device != torch.device("meta") or not hasattr(self.unet, "_hf_hook"):
+            return self.device
+        for module in self.unet.modules():
+            if (
+                hasattr(module, "_hf_hook")
+                and hasattr(module._hf_hook, "execution_device")
+                and module._hf_hook.execution_device is not None
+            ):
+                return torch.device(module._hf_hook.execution_device)
+        return self.device
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._encode_prompt
+    def _encode_prompt(self, prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            device: (`torch.device`):
+                torch device
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+            negative_prompt (`str` or `List[str]`):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+        """
+        batch_size = len(prompt) if isinstance(prompt, list) else 1
+
+        text_inputs = self.tokenizer(
+            prompt,
+            padding="max_length",
+            max_length=self.tokenizer.model_max_length,
+            truncation=True,
+            return_tensors="pt",
+        )
+        text_input_ids = text_inputs.input_ids
+        untruncated_ids = self.tokenizer(prompt, padding="max_length", return_tensors="pt").input_ids
+
+        if not torch.equal(text_input_ids, untruncated_ids):
+            removed_text = self.tokenizer.batch_decode(untruncated_ids[:, self.tokenizer.model_max_length - 1 : -1])
+            logger.warning(
+                "The following part of your input was truncated because CLIP can only handle sequences up to"
+                f" {self.tokenizer.model_max_length} tokens: {removed_text}"
+            )
+
+        if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+            attention_mask = text_inputs.attention_mask.to(device)
+        else:
+            attention_mask = None
+
+        text_embeddings = self.text_encoder(
+            text_input_ids.to(device),
+            attention_mask=attention_mask,
+        )
+        text_embeddings = text_embeddings[0]
+
+        # duplicate text embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = text_embeddings.shape
+        text_embeddings = text_embeddings.repeat(1, num_images_per_prompt, 1)
+        text_embeddings = text_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_tokens: List[str]
+            if negative_prompt is None:
+                uncond_tokens = [""] * batch_size
+            elif type(prompt) is not type(negative_prompt):
+                raise TypeError(
+                    f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
+                    f" {type(prompt)}."
+                )
+            elif isinstance(negative_prompt, str):
+                uncond_tokens = [negative_prompt]
+            elif batch_size != len(negative_prompt):
+                raise ValueError(
+                    f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:"
+                    f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches"
+                    " the batch size of `prompt`."
+                )
+            else:
+                uncond_tokens = negative_prompt
+
+            max_length = text_input_ids.shape[-1]
+            uncond_input = self.tokenizer(
+                uncond_tokens,
+                padding="max_length",
+                max_length=max_length,
+                truncation=True,
+                return_tensors="pt",
+            )
+
+            if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+                attention_mask = uncond_input.attention_mask.to(device)
+            else:
+                attention_mask = None
+
+            uncond_embeddings = self.text_encoder(
+                uncond_input.input_ids.to(device),
+                attention_mask=attention_mask,
+            )
+            uncond_embeddings = uncond_embeddings[0]
+
+            # duplicate unconditional embeddings for each generation per prompt, using mps friendly method
+            seq_len = uncond_embeddings.shape[1]
+            uncond_embeddings = uncond_embeddings.repeat(1, num_images_per_prompt, 1)
+            uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and text embeddings into a single batch
+            # to avoid doing two forward passes
+            text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
+
+        return text_embeddings
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_extra_step_kwargs
+    def prepare_extra_step_kwargs(self, generator, eta):
+        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
+        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
+        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
+        # and should be between [0, 1]
+
+        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        extra_step_kwargs = {}
+        if accepts_eta:
+            extra_step_kwargs["eta"] = eta
+
+        # check if the scheduler accepts generator
+        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        if accepts_generator:
+            extra_step_kwargs["generator"] = generator
+        return extra_step_kwargs
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.decode_latents with 0.18215->0.08333
+    def decode_latents(self, latents):
+        latents = 1 / 0.08333 * latents
+        image = self.vae.decode(latents).sample
+        image = (image / 2 + 0.5).clamp(0, 1)
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
+        return image
+
+    def check_inputs(self, prompt, image, noise_level, callback_steps):
+        if not isinstance(prompt, str) and not isinstance(prompt, list):
+            raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
+
+        if (
+            not isinstance(image, torch.Tensor)
+            and not isinstance(image, PIL.Image.Image)
+            and not isinstance(image, list)
+        ):
+            raise ValueError(
+                f"`image` has to be of type `torch.Tensor`, `PIL.Image.Image` or `list` but is {type(image)}"
+            )
+
+        # verify batch size of prompt and image are same if image is a list or tensor
+        if isinstance(image, list) or isinstance(image, torch.Tensor):
+            if isinstance(prompt, str):
+                batch_size = 1
+            else:
+                batch_size = len(prompt)
+            if isinstance(image, list):
+                image_batch_size = len(image)
+            else:
+                image_batch_size = image.shape[0]
+            if batch_size != image_batch_size:
+                raise ValueError(
+                    f"`prompt` has batch size {batch_size} and `image` has batch size {image_batch_size}."
+                    " Please make sure that passed `prompt` matches the batch size of `image`."
+                )
+
+        # check noise level
+        if noise_level > self.config.max_noise_level:
+            raise ValueError(f"`noise_level` has to be <= {self.config.max_noise_level} but is {noise_level}")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+    def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
+        shape = (batch_size, num_channels_latents, height, width)
+        if latents is None:
+            if device.type == "mps":
+                # randn does not work reproducibly on mps
+                latents = torch.randn(shape, generator=generator, device="cpu", dtype=dtype).to(device)
+            else:
+                latents = torch.randn(shape, generator=generator, device=device, dtype=dtype)
+        else:
+            if latents.shape != shape:
+                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {shape}")
+            latents = latents.to(device)
+
+        # scale the initial noise by the standard deviation required by the scheduler
+        latents = latents * self.scheduler.init_noise_sigma
+        return latents
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        prompt: Union[str, List[str]],
+        image: Union[torch.FloatTensor, PIL.Image.Image, List[PIL.Image.Image]],
+        num_inference_steps: int = 75,
+        guidance_scale: float = 9.0,
+        noise_level: int = 20,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            image (`PIL.Image.Image` or List[`PIL.Image.Image`] or `torch.FloatTensor`):
+                `Image`, or tensor representing an image batch which will be upscaled. *
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+
+        # 1. Check inputs
+        self.check_inputs(prompt, image, noise_level, callback_steps)
+
+        # 2. Define call parameters
+        batch_size = 1 if isinstance(prompt, str) else len(prompt)
+        device = self._execution_device
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        # 3. Encode input prompt
+        text_embeddings = self._encode_prompt(
+            prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt
+        )
+
+        # 4. Preprocess image
+        image = [image] if isinstance(image, PIL.Image.Image) else image
+        if isinstance(image, list):
+            image = [preprocess(img) for img in image]
+            image = torch.cat(image, dim=0)
+        image = image.to(dtype=text_embeddings.dtype, device=device)
+
+        # 5. set timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=device)
+        timesteps = self.scheduler.timesteps
+
+        # 5. Add noise to image
+        noise_level = torch.tensor([noise_level], dtype=torch.long, device=device)
+        if device.type == "mps":
+            # randn does not work reproducibly on mps
+            noise = torch.randn(image.shape, generator=generator, device="cpu", dtype=text_embeddings.dtype).to(device)
+        else:
+            noise = torch.randn(image.shape, generator=generator, device=device, dtype=text_embeddings.dtype)
+        image = self.low_res_scheduler.add_noise(image, noise, noise_level)
+        image = torch.cat([image] * 2) if do_classifier_free_guidance else image
+        noise_level = torch.cat([noise_level] * 2) if do_classifier_free_guidance else noise_level
+
+        # 6. Prepare latent variables
+        height, width = image.shape[2:]
+        num_channels_latents = self.vae.config.latent_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            text_embeddings.dtype,
+            device,
+            generator,
+            latents,
+        )
+
+        # 7. Check that sizes of image and latents match
+        num_channels_image = image.shape[1]
+        if num_channels_latents + num_channels_image != self.unet.config.in_channels:
+            raise ValueError(
+                f"Incorrect configuration settings! The config of `pipeline.unet`: {self.unet.config} expects"
+                f" {self.unet.config.in_channels} but received `num_channels_latents`: {num_channels_latents} +"
+                f" `num_channels_image`: {num_channels_image} "
+                f" = {num_channels_latents+num_channels_image}. Please verify the config of"
+                " `pipeline.unet` or your `image` input."
+            )
+
+        # 8. Prepare extra step kwargs. TODO: Logic should ideally just be moved out of the pipeline
+        extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
+
+        # 9. Denoising loop
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+
+                # concat latents, mask, masked_image_latents in the channel dimension
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+                latent_model_input = torch.cat([latent_model_input, image], dim=1)
+
+                # predict the noise residual
+                noise_pred = self.unet(
+                    latent_model_input, t, encoder_hidden_states=text_embeddings, class_labels=noise_level
+                ).sample
+
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+
+                # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
+
+        # 10. Post-processing
+        # make sure the VAE is in float32 mode, as it overflows in float16
+        self.vae.to(dtype=torch.float32)
+        image = self.decode_latents(latents.float())
+
+        # 11. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image,)
+
+        return ImagePipelineOutput(images=image)

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_upscaler.py

@@ -1,443 +0,0 @@
-# Copyright 2022 The HuggingFace Team. All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import inspect
-from typing import Callable, List, Optional, Union
-
-import numpy as np
-import torch
-from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
-
-from diffusers.utils import is_accelerate_available
-
-from ...configuration_utils import FrozenDict
-from ...models import AutoencoderKL, UNet2DConditionModel
-from ...pipeline_utils import DiffusionPipeline
-from ...schedulers import (
-    DDIMScheduler,
-    DPMSolverMultistepScheduler,
-    EulerAncestralDiscreteScheduler,
-    EulerDiscreteScheduler,
-    LMSDiscreteScheduler,
-    PNDMScheduler,
-)
-from ...utils import deprecate, logging
-from . import StableDiffusionPipelineOutput
-from .safety_checker import StableDiffusionSafetyChecker
-
-# TODO: Remove when we migrate the upscaler model to diffusers >>>>>>>
-import k_diffusion as K
-import huggingface_hub
-
-from torch import nn
-import torch.nn.functional as F
-
-UPSCALER_REPO = "pcuenq/k-upscaler"
-
-class NoiseLevelAndTextConditionedUpscaler(nn.Module):
-    def __init__(self, inner_model, sigma_data=1., embed_dim=256):
-        super().__init__()
-        self.inner_model = inner_model
-        self.sigma_data = sigma_data
-        self.low_res_noise_embed = K.layers.FourierFeatures(1, embed_dim, std=2)
-
-    def forward(self, input, sigma, low_res, low_res_sigma, c, **kwargs):
-        cross_cond, cross_cond_padding, pooler = c
-        c_in = 1 / (low_res_sigma ** 2 + self.sigma_data ** 2) ** 0.5
-        c_noise = low_res_sigma.log1p()[:, None]
-        c_in = K.utils.append_dims(c_in, low_res.ndim)
-        low_res_noise_embed = self.low_res_noise_embed(c_noise)
-        low_res_in = F.interpolate(low_res, scale_factor=2, mode='nearest') * c_in
-        mapping_cond = torch.cat([low_res_noise_embed, pooler], dim=1)
-        return self.inner_model(input, sigma, unet_cond=low_res_in, mapping_cond=mapping_cond, cross_cond=cross_cond, cross_cond_padding=cross_cond_padding, **kwargs)
-
-def make_upscaler_model(config_path, model_path, pooler_dim=768, train=False, device='cpu'):
-    config = K.config.load_config(open(config_path))
-    model = K.config.make_model(config)
-    model = NoiseLevelAndTextConditionedUpscaler(
-        model,
-        sigma_data=config['model']['sigma_data'],
-        embed_dim=config['model']['mapping_cond_dim'] - pooler_dim,
-    )
-    ckpt = torch.load(model_path, map_location='cpu')
-    model.load_state_dict(ckpt['model_ema'])
-    model = K.config.make_denoiser_wrapper(config)(model)
-    if not train:
-        model = model.eval().requires_grad_(False)
-    return model.to(device)
-
-# <<<<<< To be removed when we migrate upscaler model to diffusers
-
-
-logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
-
-
-class StableDiffusionUpscalerPipeline(DiffusionPipeline):
-    r"""
-    Pipeline for text-to-image generation using Stable Diffusion.
-
-    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
-    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
-
-    Args:
-        vae ([`AutoencoderKL`]):
-            Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
-        text_encoder ([`CLIPTextModel`]):
-            Frozen text-encoder. Stable Diffusion uses the text portion of
-            [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically
-            the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
-        tokenizer (`CLIPTokenizer`):
-            Tokenizer of class
-            [CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer).
-        scheduler ([`SchedulerMixin`]):
-            A scheduler to be used in combination with the upscaler model. Currently restricted to `EulerDiscreteScheduler`.nn
-        safety_checker ([`StableDiffusionSafetyChecker`]):
-            Classification module that estimates whether generated images could be considered offensive or harmful.
-            Please, refer to the [model card](https://huggingface.co/runwayml/stable-diffusion-v1-5) for details.
-        feature_extractor ([`CLIPFeatureExtractor`]):
-            Model that extracts features from generated images to be used as inputs for the `safety_checker`.
-    """
-
-    def __init__(
-        self,
-        vae: AutoencoderKL,
-        text_encoder: CLIPTextModel,
-        tokenizer: CLIPTokenizer,
-        scheduler: EulerDiscreteScheduler,
-        safety_checker: StableDiffusionSafetyChecker,
-        feature_extractor: CLIPFeatureExtractor,
-    ):
-        super().__init__()
-        if safety_checker is None:
-            logger.warn(
-                f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
-                " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
-                " results in services or applications open to the public. Both the diffusers team and Hugging Face"
-                " strongly recommend to keep the safety filter enabled in all public facing circumstances, disabling"
-                " it only for use-cases that involve analyzing network behavior or auditing its results. For more"
-                " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
-            )
-
-        self.register_modules(
-            vae=vae,
-            text_encoder=text_encoder,
-            tokenizer=tokenizer,
-            scheduler=scheduler,
-            safety_checker=safety_checker,
-            feature_extractor=feature_extractor,
-        )
-
-        # Download upscaler
-        config_path = huggingface_hub.hf_hub_download(UPSCALER_REPO, "config_laion_text_cond_latent_upscaler_2.json")
-        weights_path = huggingface_hub.hf_hub_download(UPSCALER_REPO, "laion_text_cond_latent_upscaler_2_1_00470000_slim.pth")
-        self.upscaler = make_upscaler_model(config_path, weights_path)
-
-    def to(self, torch_device: Optional[Union[str, torch.device]] = None):
-        self.upscaler.to(torch_device)
-        return super().to(torch_device)
-
-    def enable_xformers_memory_efficient_attention(self):
-        r"""
-        Enable memory efficient attention as implemented in xformers.
-
-        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
-        time. Speed up at training time is not guaranteed.
-
-        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
-        is used.
-        """
-        # TODO: enable in the upscaler
-        pass
-
-    def disable_xformers_memory_efficient_attention(self):
-        r"""
-        Disable memory efficient attention as implemented in xformers.
-        """
-        # TODO: disable in the upscaler
-        pass
-
-    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
-        r"""
-        Enable sliced attention computation.
-
-        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
-        in several steps. This is useful to save some memory in exchange for a small speed decrease.
-
-        Args:
-            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
-                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
-                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
-                `attention_head_dim` must be a multiple of `slice_size`.
-        """
-        pass
-
-    def disable_attention_slicing(self):
-        r"""
-        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
-        back to computing attention in one step.
-        """
-        # set slice_size = `None` to disable `attention slicing`
-        self.enable_attention_slicing(None)
-
-    def enable_sequential_cpu_offload(self):
-        r"""
-        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
-        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
-        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
-        """
-        if is_accelerate_available():
-            from accelerate import cpu_offload
-        else:
-            raise ImportError("Please install accelerate via `pip install accelerate`")
-
-        device = torch.device("cuda")
-
-        for cpu_offloaded_model in [self.text_encoder, self.vae, self.safety_checker, self.upscaler]:
-            if cpu_offloaded_model is not None:
-                cpu_offload(cpu_offloaded_model, device)
-
-    @property
-    def _execution_device(self):
-        r"""
-        Returns the device on which the pipeline's models will be executed. After calling
-        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
-        hooks.
-        """
-        if self.device != torch.device("meta") or not hasattr(self.unet, "_hf_hook"):
-            return self.device
-        for module in self.vae.modules():
-            if (
-                hasattr(module, "_hf_hook")
-                and hasattr(module._hf_hook, "execution_device")
-                and module._hf_hook.execution_device is not None
-            ):
-                return torch.device(module._hf_hook.execution_device)
-        return self.device
-
-    def _get_text_conditioning(self, prompt, device, do_classifier_free_guidance):
-        batch_size = len(prompt) if isinstance(prompt, list) else 1
-
-        def get_conditioning(text):
-            text_inputs = self.tokenizer(
-                text,
-                padding="max_length",
-                max_length=self.tokenizer.model_max_length,
-                truncation=True,
-                return_tensors="pt",
-            )
-            text_input_ids = text_inputs.input_ids.to(device)
-            attention_mask = text_inputs.attention_mask.to(device)
-            cross_cond_padding = 1 - attention_mask
-
-            # I believe the attention mask should be provided here, but the original notebook does not do it
-            # TODO: test it out
-            # clip_output = self.text_encoder(input_ids=text_input_ids, attention_mask=attention_mask, output_hidden_states=True)
-            clip_output = self.text_encoder(input_ids=text_input_ids, output_hidden_states=True)
-            hidden_states = clip_output.hidden_states[-1]
-            pooler_output = clip_output.pooler_output
-
-            return hidden_states, cross_cond_padding.to(dtype=hidden_states.dtype), pooler_output
-
-        prompt_conditioning = get_conditioning(prompt)
-        conditioning = prompt_conditioning
-
-        if do_classifier_free_guidance:
-            uncond_conditioning = get_conditioning(batch_size * [""])
-            conditioning = [torch.cat([uc_item, c_item]) for uc_item, c_item in zip(uncond_conditioning, prompt_conditioning)]
-
-        return conditioning
-
-
-    def run_safety_checker(self, image, device, dtype):
-        if self.safety_checker is not None:
-            safety_checker_input = self.feature_extractor(self.numpy_to_pil(image), return_tensors="pt").to(device)
-            image, has_nsfw_concept = self.safety_checker(
-                images=image, clip_input=safety_checker_input.pixel_values.to(dtype)
-            )
-        else:
-            has_nsfw_concept = None
-        return image, has_nsfw_concept
-
-    def decode_latents(self, latents):
-        latents = 1 / 0.18215 * latents
-        image = self.vae.decode(latents).sample
-        image = (image / 2 + 0.5).clamp(0, 1)
-        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
-        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
-        return image
-
-    def prepare_extra_step_kwargs(self, generator, eta):
-        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
-        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
-        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
-        # and should be between [0, 1]
-
-        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
-        extra_step_kwargs = {}
-        if accepts_eta:
-            extra_step_kwargs["eta"] = eta
-
-        # check if the scheduler accepts generator
-        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
-        if accepts_generator:
-            extra_step_kwargs["generator"] = generator
-        return extra_step_kwargs
-
-    def check_inputs(self, latents, prompt):
-        batch, _, height, width = latents.shape
-        if height != width:
-            raise ValueError(f"Latents should be square, got {height}x{width} instead")
-        
-        if prompt is not None:
-            if not isinstance(prompt, str) and not isinstance(prompt, list):
-                raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
-
-            if isinstance(prompt, list) and len(prompt) != batch:
-                raise ValueError(f"`prompt` length has to be equal to the latents batch_size ({batch}), but is {len(prompt)}")
-
-    @torch.no_grad()
-    def __call__(
-        self,
-        latents: torch.FloatTensor,
-        prompt: Optional[Union[str, List[str]]] = None,
-        num_inference_steps: int = 50,
-        guidance_scale: float = 7.5,
-        generator: Optional[torch.Generator] = None,
-        output_type: Optional[str] = "pil",
-        return_dict: bool = True,
-    ):
-        r"""
-        Function invoked when calling the pipeline for generation.
-
-        Args:
-            latents (`torch.FloatTensor`):
-                Latents to be upscaled. Generated from a Stable Diffusion Pipeline using `output_type="latents"`.
-            prompt (`str` or `List[str]`, *optional*):
-                The prompt or prompts to guide the image upscaling process.
-            num_inference_steps (`int`, *optional*, defaults to 50):
-                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
-                expense of slower inference.
-            guidance_scale (`float`, *optional*, defaults to 7.5):
-                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
-                `guidance_scale` is defined as `w` of equation 2. of [Imagen
-                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
-                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
-                usually at the expense of lower image quality.
-            generator (`torch.Generator`, *optional*):
-                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
-                deterministic.
-            output_type (`str`, *optional*, defaults to `"pil"`):
-                The output format of the generated image. Choose between
-                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
-            return_dict (`bool`, *optional*, defaults to `True`):
-                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
-                plain tuple.
-
-        Returns:
-            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
-            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
-            When returning a tuple, the first element is a list with the generated images, and the second element is a
-            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
-            (nsfw) content, according to the `safety_checker`.
-        """
-
-        # 1. Check inputs. Raise error if not correct
-        self.check_inputs(latents, prompt)
-
-        # 2. Define call parameters
-        batch_size, channels, height, width = latents.shape
-        if isinstance(prompt, str):
-            prompt = [prompt] * batch_size
-
-        device = self._execution_device
-        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
-        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
-        # corresponds to doing no classifier free guidance.
-        do_classifier_free_guidance = guidance_scale > 1.0
-
-        # 3. Prepare timesteps
-        # We take log-linear steps in noise-level from sigma_max to sigma_min
-        # TODO(Pedro) Fix: create the scheduler with the betas instead
-        sigma_min = self.scheduler.sigmas[-2]   # Last one is zero
-        sigma_max = self.scheduler.sigmas[0]
-        # The +1 comes from k-diffusion
-        sigmas = torch.linspace(np.log(sigma_max), np.log(sigma_min), num_inference_steps+1).exp().to(device)
-        # scheduler.sigmas = torch.cat((sigmas, torch.tensor([0.]).to(device)))
-        self.scheduler.set_timesteps(num_inference_steps, device=device)
-        self.scheduler.sigmas = sigmas
-
-        # # 4. Prepare extra step kwargs. TODO: Logic should ideally just be moved out of the pipeline
-        # extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
-
-        # 5. Prepare conditioning
-        conditioning = self._get_text_conditioning(prompt, device, do_classifier_free_guidance)
-
-        # 6. Create initial noise
-        x_shape = [batch_size, channels, 2*height, 2*width]
-        noisy_latents = torch.randn(x_shape, generator=generator, device=device, dtype=sigmas.dtype)
-
-        # Disabled; according to the notebook it doesn't seem to work well
-        # TODO: remove in final implementation
-        low_res_sigma = torch.full([batch_size], 0, device=device, dtype=sigmas.dtype)
-
-        # 7. Prepare inputs for CFG
-        low_res = latents
-        if do_classifier_free_guidance:
-            low_res = torch.cat([low_res] * 2)
-            low_res_sigma = torch.cat([low_res_sigma] * 2)
-
-        # 8. Denoising loop
-        noisy_latents = noisy_latents * sigma_max
-        for i, t in enumerate(self.progress_bar(self.scheduler.timesteps)):
-            sigma = sigmas[i]
-            sigma = sigma[None]
-
-            latent_model_input = noisy_latents
-            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
-
-            if do_classifier_free_guidance:
-                latent_model_input = torch.cat([latent_model_input] * 2)
-                sigma = torch.cat([sigma] * 2)
-
-            # predict the next denoised latent
-            denoised = self.upscaler(
-                latent_model_input,
-                sigma,
-                low_res=low_res,
-                low_res_sigma=low_res_sigma,
-                c=conditioning,
-            )
-            
-            # perform guidance
-            if do_classifier_free_guidance:
-                uncond, cond = denoised.chunk(2)
-                denoised = uncond + guidance_scale * (cond - uncond)
-
-            # compute the previous noisy sample x_t -> x_t-1
-            noisy_latents = self.scheduler.step(denoised, t, noisy_latents).prev_sample
-
-        # 9. Post-processing
-        image = self.decode_latents(noisy_latents)
-
-        # 10. Run safety checker
-        image, has_nsfw_concept = self.run_safety_checker(image, device, sigmas.dtype)
-
-        # 11. Convert to PIL
-        if output_type == "pil":
-            image = self.numpy_to_pil(image)
-
-        if not return_dict:
-            return (image, has_nsfw_concept)
-
-        return StableDiffusionPipelineOutput(images=image, nsfw_content_detected=has_nsfw_concept)

src/diffusers/pipelines/stable_diffusion_safe/__init__.py

@@ -0,0 +1,72 @@
+from dataclasses import dataclass
+from enum import Enum
+from typing import List, Optional, Union
+
+import numpy as np
+
+import PIL
+from PIL import Image
+
+from ...utils import BaseOutput, is_torch_available, is_transformers_available
+
+
+@dataclass
+class SafetyConfig(object):
+    WEAK = {
+        "sld_warmup_steps": 15,
+        "sld_guidance_scale": 20,
+        "sld_threshold": 0.0,
+        "sld_momentum_scale": 0.0,
+        "sld_mom_beta": 0.0,
+    }
+    MEDIUM = {
+        "sld_warmup_steps": 10,
+        "sld_guidance_scale": 1000,
+        "sld_threshold": 0.01,
+        "sld_momentum_scale": 0.3,
+        "sld_mom_beta": 0.4,
+    }
+    STRONG = {
+        "sld_warmup_steps": 7,
+        "sld_guidance_scale": 2000,
+        "sld_threshold": 0.025,
+        "sld_momentum_scale": 0.5,
+        "sld_mom_beta": 0.7,
+    }
+    MAX = {
+        "sld_warmup_steps": 0,
+        "sld_guidance_scale": 5000,
+        "sld_threshold": 1.0,
+        "sld_momentum_scale": 0.5,
+        "sld_mom_beta": 0.7,
+    }
+
+
+@dataclass
+class StableDiffusionSafePipelineOutput(BaseOutput):
+    """
+    Output class for Safe Stable Diffusion pipelines.
+
+    Args:
+        images (`List[PIL.Image.Image]` or `np.ndarray`)
+            List of denoised PIL images of length `batch_size` or numpy array of shape `(batch_size, height, width,
+            num_channels)`. PIL images or numpy array present the denoised images of the diffusion pipeline.
+        nsfw_content_detected (`List[bool]`)
+            List of flags denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, or `None` if safety checking could not be performed.
+        images (`List[PIL.Image.Image]` or `np.ndarray`)
+            List of denoised PIL images that were flagged by the safety checker any may contain "not-safe-for-work"
+            (nsfw) content, or `None` if no safety check was performed or no images were flagged.
+        applied_safety_concept (`str`)
+            The safety concept that was applied for safety guidance, or `None` if safety guidance was disabled
+    """
+
+    images: Union[List[PIL.Image.Image], np.ndarray]
+    nsfw_content_detected: Optional[List[bool]]
+    unsafe_images: Optional[Union[List[PIL.Image.Image], np.ndarray]]
+    applied_safety_concept: Optional[str]
+
+
+if is_transformers_available() and is_torch_available():
+    from .pipeline_stable_diffusion_safe import StableDiffusionPipelineSafe
+    from .safety_checker import SafeStableDiffusionSafetyChecker

src/diffusers/pipelines/stable_diffusion_safe/pipeline_stable_diffusion_safe.py

@@ -0,0 +1,764 @@
+import inspect
+import warnings
+from typing import Callable, List, Optional, Union
+
+import numpy as np
+import torch
+
+from packaging import version
+from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
+
+from ...configuration_utils import FrozenDict
+from ...models import AutoencoderKL, UNet2DConditionModel
+from ...pipeline_utils import DiffusionPipeline
+from ...schedulers import (
+    DDIMScheduler,
+    DPMSolverMultistepScheduler,
+    EulerAncestralDiscreteScheduler,
+    EulerDiscreteScheduler,
+    LMSDiscreteScheduler,
+    PNDMScheduler,
+)
+from ...utils import deprecate, is_accelerate_available, logging
+from . import StableDiffusionSafePipelineOutput
+from .safety_checker import SafeStableDiffusionSafetyChecker
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+class StableDiffusionPipelineSafe(DiffusionPipeline):
+    r"""
+    Pipeline for text-to-image generation using Safe Latent Diffusion.
+
+    The implementation is based on the [`StableDiffusionPipeline`]
+
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Args:
+        vae ([`AutoencoderKL`]):
+            Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
+        text_encoder ([`CLIPTextModel`]):
+            Frozen text-encoder. Stable Diffusion uses the text portion of
+            [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically
+            the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
+        tokenizer (`CLIPTokenizer`):
+            Tokenizer of class
+            [CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+        safety_checker ([`StableDiffusionSafetyChecker`]):
+            Classification module that estimates whether generated images could be considered offensive or harmful.
+            Please, refer to the [model card](https://huggingface.co/runwayml/stable-diffusion-v1-5) for details.
+        feature_extractor ([`CLIPFeatureExtractor`]):
+            Model that extracts features from generated images to be used as inputs for the `safety_checker`.
+    """
+
+    _optional_components = ["safety_checker", "feature_extractor"]
+
+    def __init__(
+        self,
+        vae: AutoencoderKL,
+        text_encoder: CLIPTextModel,
+        tokenizer: CLIPTokenizer,
+        unet: UNet2DConditionModel,
+        scheduler: Union[
+            DDIMScheduler,
+            DPMSolverMultistepScheduler,
+            EulerAncestralDiscreteScheduler,
+            EulerDiscreteScheduler,
+            LMSDiscreteScheduler,
+            PNDMScheduler,
+        ],
+        safety_checker: SafeStableDiffusionSafetyChecker,
+        feature_extractor: CLIPFeatureExtractor,
+        requires_safety_checker: bool = True,
+    ):
+        super().__init__()
+        safety_concept: Optional[str] = (
+            "an image showing hate, harassment, violence, suffering, humiliation, harm, suicide, sexual, nudity,"
+            " bodily fluids, blood, obscene gestures, illegal activity, drug use, theft, vandalism, weapons, child"
+            " abuse, brutality, cruelty"
+        )
+
+        if hasattr(scheduler.config, "steps_offset") and scheduler.config.steps_offset != 1:
+            deprecation_message = (
+                f"The configuration file of this scheduler: {scheduler} is outdated. `steps_offset`"
+                f" should be set to 1 instead of {scheduler.config.steps_offset}. Please make sure "
+                "to update the config accordingly as leaving `steps_offset` might led to incorrect results"
+                " in future versions. If you have downloaded this checkpoint from the Hugging Face Hub,"
+                " it would be very nice if you could open a Pull request for the `scheduler/scheduler_config.json`"
+                " file"
+            )
+            deprecate("steps_offset!=1", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(scheduler.config)
+            new_config["steps_offset"] = 1
+            scheduler._internal_dict = FrozenDict(new_config)
+
+        if hasattr(scheduler.config, "clip_sample") and scheduler.config.clip_sample is True:
+            deprecation_message = (
+                f"The configuration file of this scheduler: {scheduler} has not set the configuration `clip_sample`."
+                " `clip_sample` should be set to False in the configuration file. Please make sure to update the"
+                " config accordingly as not setting `clip_sample` in the config might lead to incorrect results in"
+                " future versions. If you have downloaded this checkpoint from the Hugging Face Hub, it would be very"
+                " nice if you could open a Pull request for the `scheduler/scheduler_config.json` file"
+            )
+            deprecate("clip_sample not set", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(scheduler.config)
+            new_config["clip_sample"] = False
+            scheduler._internal_dict = FrozenDict(new_config)
+
+        if safety_checker is None and requires_safety_checker:
+            logger.warning(
+                f"You have disabled the safety checker for {self.__class__} by passing `safety_checker=None`. Ensure"
+                " that you abide to the conditions of the Stable Diffusion license and do not expose unfiltered"
+                " results in services or applications open to the public. Both the diffusers team and Hugging Face"
+                " strongly recommend to keep the safety filter enabled in all public facing circumstances, disabling"
+                " it only for use-cases that involve analyzing network behavior or auditing its results. For more"
+                " information, please have a look at https://github.com/huggingface/diffusers/pull/254 ."
+            )
+
+        if safety_checker is not None and feature_extractor is None:
+            raise ValueError(
+                "Make sure to define a feature extractor when loading {self.__class__} if you want to use the safety"
+                " checker. If you do not want to use the safety checker, you can pass `'safety_checker=None'` instead."
+            )
+
+        is_unet_version_less_0_9_0 = hasattr(unet.config, "_diffusers_version") and version.parse(
+            version.parse(unet.config._diffusers_version).base_version
+        ) < version.parse("0.9.0.dev0")
+        is_unet_sample_size_less_64 = hasattr(unet.config, "sample_size") and unet.config.sample_size < 64
+        if is_unet_version_less_0_9_0 and is_unet_sample_size_less_64:
+            deprecation_message = (
+                "The configuration file of the unet has set the default `sample_size` to smaller than"
+                " 64 which seems highly unlikely .If you're checkpoint is a fine-tuned version of any of the"
+                " following: \n- CompVis/stable-diffusion-v1-4 \n- CompVis/stable-diffusion-v1-3 \n-"
+                " CompVis/stable-diffusion-v1-2 \n- CompVis/stable-diffusion-v1-1 \n- runwayml/stable-diffusion-v1-5"
+                " \n- runwayml/stable-diffusion-inpainting \n you should change 'sample_size' to 64 in the"
+                " configuration file. Please make sure to update the config accordingly as leaving `sample_size=32`"
+                " in the config might lead to incorrect results in future versions. If you have downloaded this"
+                " checkpoint from the Hugging Face Hub, it would be very nice if you could open a Pull request for"
+                " the `unet/config.json` file"
+            )
+            deprecate("sample_size<64", "1.0.0", deprecation_message, standard_warn=False)
+            new_config = dict(unet.config)
+            new_config["sample_size"] = 64
+            unet._internal_dict = FrozenDict(new_config)
+
+        self.register_modules(
+            vae=vae,
+            text_encoder=text_encoder,
+            tokenizer=tokenizer,
+            unet=unet,
+            scheduler=scheduler,
+            safety_checker=safety_checker,
+            feature_extractor=feature_extractor,
+        )
+        self._safety_text_concept = safety_concept
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+        self.register_to_config(requires_safety_checker=requires_safety_checker)
+
+    @property
+    def safety_concept(self):
+        r"""
+        Getter method for the safety concept used with SLD
+
+        Returns:
+            `str`: The text describing the safety concept
+        """
+        return self._safety_text_concept
+
+    @safety_concept.setter
+    def safety_concept(self, concept):
+        r"""
+        Setter method for the safety concept used with SLD
+
+        Args:
+            concept (`str`):
+                The text of the new safety concept
+        """
+        self._safety_text_concept = concept
+
+    def enable_xformers_memory_efficient_attention(self):
+        r"""
+        Enable memory efficient attention as implemented in xformers.
+
+        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
+        time. Speed up at training time is not guaranteed.
+
+        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
+        is used.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(True)
+
+    def disable_xformers_memory_efficient_attention(self):
+        r"""
+        Disable memory efficient attention as implemented in xformers.
+        """
+        self.unet.set_use_memory_efficient_attention_xformers(False)
+
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            # half the attention head size is usually a good trade-off between
+            # speed and memory
+            slice_size = self.unet.config.attention_head_dim // 2
+        self.unet.set_attention_slice(slice_size)
+
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    def enable_sequential_cpu_offload(self):
+        r"""
+        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
+        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
+        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
+        """
+        if is_accelerate_available():
+            from accelerate import cpu_offload
+        else:
+            raise ImportError("Please install accelerate via `pip install accelerate`")
+
+        device = torch.device("cuda")
+
+        for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
+            if cpu_offloaded_model is not None:
+                cpu_offload(cpu_offloaded_model, device)
+
+    @property
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device
+    def _execution_device(self):
+        r"""
+        Returns the device on which the pipeline's models will be executed. After calling
+        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
+        hooks.
+        """
+        if self.device != torch.device("meta") or not hasattr(self.unet, "_hf_hook"):
+            return self.device
+        for module in self.unet.modules():
+            if (
+                hasattr(module, "_hf_hook")
+                and hasattr(module._hf_hook, "execution_device")
+                and module._hf_hook.execution_device is not None
+            ):
+                return torch.device(module._hf_hook.execution_device)
+        return self.device
+
+    def _encode_prompt(
+        self,
+        prompt,
+        device,
+        num_images_per_prompt,
+        do_classifier_free_guidance,
+        negative_prompt,
+        enable_safety_guidance,
+    ):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            device: (`torch.device`):
+                torch device
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+            negative_prompt (`str` or `List[str]`):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+        """
+        batch_size = len(prompt) if isinstance(prompt, list) else 1
+
+        text_inputs = self.tokenizer(
+            prompt,
+            padding="max_length",
+            max_length=self.tokenizer.model_max_length,
+            truncation=True,
+            return_tensors="pt",
+        )
+        text_input_ids = text_inputs.input_ids
+        untruncated_ids = self.tokenizer(prompt, padding="max_length", return_tensors="pt").input_ids
+
+        if not torch.equal(text_input_ids, untruncated_ids):
+            removed_text = self.tokenizer.batch_decode(untruncated_ids[:, self.tokenizer.model_max_length - 1 : -1])
+            logger.warning(
+                "The following part of your input was truncated because CLIP can only handle sequences up to"
+                f" {self.tokenizer.model_max_length} tokens: {removed_text}"
+            )
+
+        if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+            attention_mask = text_inputs.attention_mask.to(device)
+        else:
+            attention_mask = None
+
+        text_embeddings = self.text_encoder(
+            text_input_ids.to(device),
+            attention_mask=attention_mask,
+        )
+        text_embeddings = text_embeddings[0]
+
+        # duplicate text embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = text_embeddings.shape
+        text_embeddings = text_embeddings.repeat(1, num_images_per_prompt, 1)
+        text_embeddings = text_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_tokens: List[str]
+            if negative_prompt is None:
+                uncond_tokens = [""] * batch_size
+            elif type(prompt) is not type(negative_prompt):
+                raise TypeError(
+                    f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
+                    f" {type(prompt)}."
+                )
+            elif isinstance(negative_prompt, str):
+                uncond_tokens = [negative_prompt]
+            elif batch_size != len(negative_prompt):
+                raise ValueError(
+                    f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:"
+                    f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches"
+                    " the batch size of `prompt`."
+                )
+            else:
+                uncond_tokens = negative_prompt
+
+            max_length = text_input_ids.shape[-1]
+            uncond_input = self.tokenizer(
+                uncond_tokens,
+                padding="max_length",
+                max_length=max_length,
+                truncation=True,
+                return_tensors="pt",
+            )
+
+            if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+                attention_mask = uncond_input.attention_mask.to(device)
+            else:
+                attention_mask = None
+
+            uncond_embeddings = self.text_encoder(
+                uncond_input.input_ids.to(device),
+                attention_mask=attention_mask,
+            )
+            uncond_embeddings = uncond_embeddings[0]
+
+            # duplicate unconditional embeddings for each generation per prompt, using mps friendly method
+            seq_len = uncond_embeddings.shape[1]
+            uncond_embeddings = uncond_embeddings.repeat(1, num_images_per_prompt, 1)
+            uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+            # Encode the safety concept text
+            if enable_safety_guidance:
+                safety_concept_input = self.tokenizer(
+                    [self._safety_text_concept],
+                    padding="max_length",
+                    max_length=max_length,
+                    truncation=True,
+                    return_tensors="pt",
+                )
+                safety_embeddings = self.text_encoder(safety_concept_input.input_ids.to(self.device))[0]
+
+                # duplicate safety embeddings for each generation per prompt, using mps friendly method
+                seq_len = safety_embeddings.shape[1]
+                safety_embeddings = safety_embeddings.repeat(batch_size, num_images_per_prompt, 1)
+                safety_embeddings = safety_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+                # For classifier free guidance + sld, we need to do three forward passes.
+                # Here we concatenate the unconditional and text embeddings into a single batch
+                # to avoid doing three forward passes
+                text_embeddings = torch.cat([uncond_embeddings, text_embeddings, safety_embeddings])
+
+            else:
+                # For classifier free guidance, we need to do two forward passes.
+                # Here we concatenate the unconditional and text embeddings into a single batch
+                # to avoid doing two forward passes
+                text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
+
+        return text_embeddings
+
+    def run_safety_checker(self, image, device, dtype, enable_safety_guidance):
+        if self.safety_checker is not None:
+            safety_checker_input = self.feature_extractor(self.numpy_to_pil(image), return_tensors="pt").to(device)
+            image, has_nsfw_concept = self.safety_checker(
+                images=image, clip_input=safety_checker_input.pixel_values.to(dtype)
+            )
+            flagged_images = None
+            if any(has_nsfw_concept):
+                logger.warning(
+                    "Potential NSFW content was detected in one or more images. A black image will be returned"
+                    " instead."
+                    f" {'You may look at this images in the `unsafe_images` variable of the output at your own discretion.' if enable_safety_guidance else 'Try again with a different prompt and/or seed.'} "
+                )
+                flagged_images = np.zeros((2, *image.shape[1:]))
+                for idx, has_nsfw_concept in enumerate(has_nsfw_concept):
+                    if has_nsfw_concept:
+                        flagged_images[idx] = image[idx]
+                        image[idx] = np.zeros(image[idx].shape)  # black image
+        else:
+            has_nsfw_concept = None
+            flagged_images = None
+        return image, has_nsfw_concept, flagged_images
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.decode_latents
+    def decode_latents(self, latents):
+        latents = 1 / 0.18215 * latents
+        image = self.vae.decode(latents).sample
+        image = (image / 2 + 0.5).clamp(0, 1)
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
+        return image
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_extra_step_kwargs
+    def prepare_extra_step_kwargs(self, generator, eta):
+        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
+        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
+        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
+        # and should be between [0, 1]
+
+        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        extra_step_kwargs = {}
+        if accepts_eta:
+            extra_step_kwargs["eta"] = eta
+
+        # check if the scheduler accepts generator
+        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        if accepts_generator:
+            extra_step_kwargs["generator"] = generator
+        return extra_step_kwargs
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.check_inputs
+    def check_inputs(self, prompt, height, width, callback_steps):
+        if not isinstance(prompt, str) and not isinstance(prompt, list):
+            raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
+
+        if height % 8 != 0 or width % 8 != 0:
+            raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_latents
+    def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
+        if latents is None:
+            if device.type == "mps":
+                # randn does not work reproducibly on mps
+                latents = torch.randn(shape, generator=generator, device="cpu", dtype=dtype).to(device)
+            else:
+                latents = torch.randn(shape, generator=generator, device=device, dtype=dtype)
+        else:
+            if latents.shape != shape:
+                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {shape}")
+            latents = latents.to(device)
+
+        # scale the initial noise by the standard deviation required by the scheduler
+        latents = latents * self.scheduler.init_noise_sigma
+        return latents
+
+    def perform_safety_guidance(
+        self,
+        enable_safety_guidance,
+        safety_momentum,
+        noise_guidance,
+        noise_pred_out,
+        i,
+        sld_guidance_scale,
+        sld_warmup_steps,
+        sld_threshold,
+        sld_momentum_scale,
+        sld_mom_beta,
+    ):
+        # Perform SLD guidance
+        if enable_safety_guidance:
+            if safety_momentum is None:
+                safety_momentum = torch.zeros_like(noise_guidance)
+            noise_pred_text, noise_pred_uncond = noise_pred_out[0], noise_pred_out[1]
+            noise_pred_safety_concept = noise_pred_out[2]
+
+            # Equation 6
+            scale = torch.clamp(torch.abs((noise_pred_text - noise_pred_safety_concept)) * sld_guidance_scale, max=1.0)
+
+            # Equation 6
+            safety_concept_scale = torch.where(
+                (noise_pred_text - noise_pred_safety_concept) >= sld_threshold, torch.zeros_like(scale), scale
+            )
+
+            # Equation 4
+            noise_guidance_safety = torch.mul((noise_pred_safety_concept - noise_pred_uncond), safety_concept_scale)
+
+            # Equation 7
+            noise_guidance_safety = noise_guidance_safety + sld_momentum_scale * safety_momentum
+
+            # Equation 8
+            safety_momentum = sld_mom_beta * safety_momentum + (1 - sld_mom_beta) * noise_guidance_safety
+
+            if i >= sld_warmup_steps:  # Warmup
+                # Equation 3
+                noise_guidance = noise_guidance - noise_guidance_safety
+        return noise_guidance, safety_momentum
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        prompt: Union[str, List[str]],
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+        sld_guidance_scale: Optional[float] = 1000,
+        sld_warmup_steps: Optional[int] = 10,
+        sld_threshold: Optional[float] = 0.01,
+        sld_momentum_scale: Optional[float] = 0.3,
+        sld_mom_beta: Optional[float] = 0.4,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+            sld_guidance_scale (`float`, *optional*, defaults to 1000):
+                Safe latent guidance as defined in [Safe Latent Diffusion](https://arxiv.org/abs/2211.05105).
+                `sld_guidance_scale` is defined as sS of Eq. 6. If set to be less than 1, safety guidance will be
+                disabled.
+            sld_warmup_steps (`int`, *optional*, defaults to 10):
+                Number of warmup steps for safety guidance. SLD will only be applied for diffusion steps greater than
+                `sld_warmup_steps`. `sld_warmup_steps` is defined as `delta` of [Safe Latent
+                Diffusion](https://arxiv.org/abs/2211.05105).
+            sld_threshold (`float`, *optional*, defaults to 0.01):
+                Threshold that separates the hyperplane between appropriate and inappropriate images. `sld_threshold`
+                is defined as `lamda` of Eq. 5 in [Safe Latent Diffusion](https://arxiv.org/abs/2211.05105).
+            sld_momentum_scale (`float`, *optional*, defaults to 0.3):
+                Scale of the SLD momentum to be added to the safety guidance at each diffusion step. If set to 0.0
+                momentum will be disabled. Momentum is already built up during warmup, i.e. for diffusion steps smaller
+                than `sld_warmup_steps`. `sld_momentum_scale` is defined as `sm` of Eq. 7 in [Safe Latent
+                Diffusion](https://arxiv.org/abs/2211.05105).
+            sld_mom_beta (`float`, *optional*, defaults to 0.4):
+                Defines how safety guidance momentum builds up. `sld_mom_beta` indicates how much of the previous
+                momentum will be kept. Momentum is already built up during warmup, i.e. for diffusion steps smaller
+                than `sld_warmup_steps`. `sld_mom_beta` is defined as `beta m` of Eq. 8 in [Safe Latent
+                Diffusion](https://arxiv.org/abs/2211.05105).
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
+
+        # 1. Check inputs. Raise error if not correct
+        self.check_inputs(prompt, height, width, callback_steps)
+
+        # 2. Define call parameters
+        batch_size = 1 if isinstance(prompt, str) else len(prompt)
+        device = self._execution_device
+
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        enable_safety_guidance = sld_guidance_scale > 1.0 and do_classifier_free_guidance
+        if not enable_safety_guidance:
+            warnings.warn("Safety checker disabled!")
+
+        # 3. Encode input prompt
+        text_embeddings = self._encode_prompt(
+            prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt, enable_safety_guidance
+        )
+
+        # 4. Prepare timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=device)
+        timesteps = self.scheduler.timesteps
+
+        # 5. Prepare latent variables
+        num_channels_latents = self.unet.in_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            text_embeddings.dtype,
+            device,
+            generator,
+            latents,
+        )
+
+        # 6. Prepare extra step kwargs.
+        extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
+
+        safety_momentum = None
+
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            for i, t in enumerate(timesteps):
+                # expand the latents if we are doing classifier free guidance
+                latent_model_input = (
+                    torch.cat([latents] * (3 if enable_safety_guidance else 2))
+                    if do_classifier_free_guidance
+                    else latents
+                )
+                latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+
+                # predict the noise residual
+                noise_pred = self.unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+
+                # perform guidance
+                if do_classifier_free_guidance:
+                    noise_pred_out = noise_pred.chunk((3 if enable_safety_guidance else 2))
+                    noise_pred_uncond, noise_pred_text = noise_pred_out[0], noise_pred_out[1]
+
+                    # default classifier free guidance
+                    noise_guidance = noise_pred_text - noise_pred_uncond
+
+                    # Perform SLD guidance
+                    if enable_safety_guidance:
+                        if safety_momentum is None:
+                            safety_momentum = torch.zeros_like(noise_guidance)
+                        noise_pred_safety_concept = noise_pred_out[2]
+
+                        # Equation 6
+                        scale = torch.clamp(
+                            torch.abs((noise_pred_text - noise_pred_safety_concept)) * sld_guidance_scale, max=1.0
+                        )
+
+                        # Equation 6
+                        safety_concept_scale = torch.where(
+                            (noise_pred_text - noise_pred_safety_concept) >= sld_threshold,
+                            torch.zeros_like(scale),
+                            scale,
+                        )
+
+                        # Equation 4
+                        noise_guidance_safety = torch.mul(
+                            (noise_pred_safety_concept - noise_pred_uncond), safety_concept_scale
+                        )
+
+                        # Equation 7
+                        noise_guidance_safety = noise_guidance_safety + sld_momentum_scale * safety_momentum
+
+                        # Equation 8
+                        safety_momentum = sld_mom_beta * safety_momentum + (1 - sld_mom_beta) * noise_guidance_safety
+
+                        if i >= sld_warmup_steps:  # Warmup
+                            # Equation 3
+                            noise_guidance = noise_guidance - noise_guidance_safety
+
+                    noise_pred = noise_pred_uncond + guidance_scale * noise_guidance
+
+                    # compute the previous noisy sample x_t -> x_t-1
+                latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        callback(i, t, latents)
+
+        # 8. Post-processing
+        image = self.decode_latents(latents)
+
+        # 9. Run safety checker
+        image, has_nsfw_concept, flagged_images = self.run_safety_checker(
+            image, device, text_embeddings.dtype, enable_safety_guidance
+        )
+
+        # 10. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+            if flagged_images is not None:
+                flagged_images = self.numpy_to_pil(flagged_images)
+
+        if not return_dict:
+            return (
+                image,
+                has_nsfw_concept,
+                self._safety_text_concept if enable_safety_guidance else None,
+                flagged_images,
+            )
+
+        return StableDiffusionSafePipelineOutput(
+            images=image,
+            nsfw_content_detected=has_nsfw_concept,
+            applied_safety_concept=self._safety_text_concept if enable_safety_guidance else None,
+            unsafe_images=flagged_images,
+        )

src/diffusers/pipelines/stable_diffusion_safe/safety_checker.py

@@ -0,0 +1,110 @@
+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import torch
+import torch.nn as nn
+
+from transformers import CLIPConfig, CLIPVisionModel, PreTrainedModel
+
+from ...utils import logging
+
+
+logger = logging.get_logger(__name__)
+
+
+def cosine_distance(image_embeds, text_embeds):
+    normalized_image_embeds = nn.functional.normalize(image_embeds)
+    normalized_text_embeds = nn.functional.normalize(text_embeds)
+    return torch.mm(normalized_image_embeds, normalized_text_embeds.t())
+
+
+class SafeStableDiffusionSafetyChecker(PreTrainedModel):
+    config_class = CLIPConfig
+
+    _no_split_modules = ["CLIPEncoderLayer"]
+
+    def __init__(self, config: CLIPConfig):
+        super().__init__(config)
+
+        self.vision_model = CLIPVisionModel(config.vision_config)
+        self.visual_projection = nn.Linear(config.vision_config.hidden_size, config.projection_dim, bias=False)
+
+        self.concept_embeds = nn.Parameter(torch.ones(17, config.projection_dim), requires_grad=False)
+        self.special_care_embeds = nn.Parameter(torch.ones(3, config.projection_dim), requires_grad=False)
+
+        self.concept_embeds_weights = nn.Parameter(torch.ones(17), requires_grad=False)
+        self.special_care_embeds_weights = nn.Parameter(torch.ones(3), requires_grad=False)
+
+    @torch.no_grad()
+    def forward(self, clip_input, images):
+        pooled_output = self.vision_model(clip_input)[1]  # pooled_output
+        image_embeds = self.visual_projection(pooled_output)
+
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        special_cos_dist = cosine_distance(image_embeds, self.special_care_embeds).cpu().float().numpy()
+        cos_dist = cosine_distance(image_embeds, self.concept_embeds).cpu().float().numpy()
+
+        result = []
+        batch_size = image_embeds.shape[0]
+        for i in range(batch_size):
+            result_img = {"special_scores": {}, "special_care": [], "concept_scores": {}, "bad_concepts": []}
+
+            # increase this value to create a stronger `nfsw` filter
+            # at the cost of increasing the possibility of filtering benign images
+            adjustment = 0.0
+
+            for concept_idx in range(len(special_cos_dist[0])):
+                concept_cos = special_cos_dist[i][concept_idx]
+                concept_threshold = self.special_care_embeds_weights[concept_idx].item()
+                result_img["special_scores"][concept_idx] = round(concept_cos - concept_threshold + adjustment, 3)
+                if result_img["special_scores"][concept_idx] > 0:
+                    result_img["special_care"].append({concept_idx, result_img["special_scores"][concept_idx]})
+                    adjustment = 0.01
+
+            for concept_idx in range(len(cos_dist[0])):
+                concept_cos = cos_dist[i][concept_idx]
+                concept_threshold = self.concept_embeds_weights[concept_idx].item()
+                result_img["concept_scores"][concept_idx] = round(concept_cos - concept_threshold + adjustment, 3)
+                if result_img["concept_scores"][concept_idx] > 0:
+                    result_img["bad_concepts"].append(concept_idx)
+
+            result.append(result_img)
+
+        has_nsfw_concepts = [len(res["bad_concepts"]) > 0 for res in result]
+
+        return images, has_nsfw_concepts
+
+    @torch.no_grad()
+    def forward_onnx(self, clip_input: torch.FloatTensor, images: torch.FloatTensor):
+        pooled_output = self.vision_model(clip_input)[1]  # pooled_output
+        image_embeds = self.visual_projection(pooled_output)
+
+        special_cos_dist = cosine_distance(image_embeds, self.special_care_embeds)
+        cos_dist = cosine_distance(image_embeds, self.concept_embeds)
+
+        # increase this value to create a stronger `nsfw` filter
+        # at the cost of increasing the possibility of filtering benign images
+        adjustment = 0.0
+
+        special_scores = special_cos_dist - self.special_care_embeds_weights + adjustment
+        # special_scores = special_scores.round(decimals=3)
+        special_care = torch.any(special_scores > 0, dim=1)
+        special_adjustment = special_care * 0.01
+        special_adjustment = special_adjustment.unsqueeze(1).expand(-1, cos_dist.shape[1])
+
+        concept_scores = (cos_dist - self.concept_embeds_weights) + special_adjustment
+        # concept_scores = concept_scores.round(decimals=3)
+        has_nsfw_concepts = torch.any(concept_scores > 0, dim=1)
+
+        return images, has_nsfw_concepts

src/diffusers/pipelines/versatile_diffusion/__init__.py

@@ -0,0 +1,16 @@
+from ...utils import is_torch_available, is_transformers_available, is_transformers_version
+
+
+if is_transformers_available() and is_torch_available() and is_transformers_version(">=", "4.25.0.dev0"):
+    from .modeling_text_unet import UNetFlatConditionModel
+    from .pipeline_versatile_diffusion import VersatileDiffusionPipeline
+    from .pipeline_versatile_diffusion_dual_guided import VersatileDiffusionDualGuidedPipeline
+    from .pipeline_versatile_diffusion_image_variation import VersatileDiffusionImageVariationPipeline
+    from .pipeline_versatile_diffusion_text_to_image import VersatileDiffusionTextToImagePipeline
+else:
+    from ...utils.dummy_torch_and_transformers_objects import (
+        VersatileDiffusionDualGuidedPipeline,
+        VersatileDiffusionImageVariationPipeline,
+        VersatileDiffusionPipeline,
+        VersatileDiffusionTextToImagePipeline,
+    )

src/diffusers/pipelines/versatile_diffusion/pipeline_versatile_diffusion.py

@@ -0,0 +1,463 @@
+import inspect
+from typing import Callable, List, Optional, Union
+
+import torch
+
+import PIL.Image
+from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer, CLIPVisionModel
+
+from ...models import AutoencoderKL, UNet2DConditionModel
+from ...pipeline_utils import DiffusionPipeline
+from ...schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
+from ...utils import logging
+from .pipeline_versatile_diffusion_dual_guided import VersatileDiffusionDualGuidedPipeline
+from .pipeline_versatile_diffusion_image_variation import VersatileDiffusionImageVariationPipeline
+from .pipeline_versatile_diffusion_text_to_image import VersatileDiffusionTextToImagePipeline
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+class VersatileDiffusionPipeline(DiffusionPipeline):
+    r"""
+    Pipeline for text-to-image generation using Stable Diffusion.
+
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Args:
+        vae ([`AutoencoderKL`]):
+            Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
+        text_encoder ([`CLIPTextModel`]):
+            Frozen text-encoder. Stable Diffusion uses the text portion of
+            [CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically
+            the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
+        tokenizer (`CLIPTokenizer`):
+            Tokenizer of class
+            [CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+        safety_checker ([`StableDiffusionMegaSafetyChecker`]):
+            Classification module that estimates whether generated images could be considered offensive or harmful.
+            Please, refer to the [model card](https://huggingface.co/runwayml/stable-diffusion-v1-5) for details.
+        feature_extractor ([`CLIPFeatureExtractor`]):
+            Model that extracts features from generated images to be used as inputs for the `safety_checker`.
+    """
+
+    tokenizer: CLIPTokenizer
+    image_feature_extractor: CLIPFeatureExtractor
+    text_encoder: CLIPTextModel
+    image_encoder: CLIPVisionModel
+    image_unet: UNet2DConditionModel
+    text_unet: UNet2DConditionModel
+    vae: AutoencoderKL
+    scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler]
+
+    def __init__(
+        self,
+        tokenizer: CLIPTokenizer,
+        image_feature_extractor: CLIPFeatureExtractor,
+        text_encoder: CLIPTextModel,
+        image_encoder: CLIPVisionModel,
+        image_unet: UNet2DConditionModel,
+        text_unet: UNet2DConditionModel,
+        vae: AutoencoderKL,
+        scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
+    ):
+        super().__init__()
+
+        self.register_modules(
+            tokenizer=tokenizer,
+            image_feature_extractor=image_feature_extractor,
+            text_encoder=text_encoder,
+            image_encoder=image_encoder,
+            image_unet=image_unet,
+            text_unet=text_unet,
+            vae=vae,
+            scheduler=scheduler,
+        )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            # half the attention head size is usually a good trade-off between
+            # speed and memory
+            slice_size = self.image_unet.config.attention_head_dim // 2
+        self.image_unet.set_attention_slice(slice_size)
+        self.text_unet.set_attention_slice(slice_size)
+
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    @torch.no_grad()
+    def image_variation(
+        self,
+        image: Union[torch.FloatTensor, PIL.Image.Image],
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            image (`PIL.Image.Image`, `List[PIL.Image.Image]` or `torch.Tensor`):
+                The image prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Examples:
+
+        ```py
+        >>> from diffusers import VersatileDiffusionPipeline
+        >>> import torch
+        >>> import requests
+        >>> from io import BytesIO
+        >>> from PIL import Image
+
+        >>> # let's download an initial image
+        >>> url = "https://huggingface.co/datasets/diffusers/images/resolve/main/benz.jpg"
+
+        >>> response = requests.get(url)
+        >>> image = Image.open(BytesIO(response.content)).convert("RGB")
+
+        >>> pipe = VersatileDiffusionPipeline.from_pretrained(
+        ...     "shi-labs/versatile-diffusion", torch_dtype=torch.float16
+        ... )
+        >>> pipe = pipe.to("cuda")
+
+        >>> generator = torch.Generator(device="cuda").manual_seed(0)
+        >>> image = pipe.image_variation(image, generator=generator).images[0]
+        >>> image.save("./car_variation.png")
+        ```
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+        expected_components = inspect.signature(VersatileDiffusionImageVariationPipeline.__init__).parameters.keys()
+        components = {name: component for name, component in self.components.items() if name in expected_components}
+        return VersatileDiffusionImageVariationPipeline(**components)(
+            image=image,
+            height=height,
+            width=width,
+            num_inference_steps=num_inference_steps,
+            guidance_scale=guidance_scale,
+            negative_prompt=negative_prompt,
+            num_images_per_prompt=num_images_per_prompt,
+            eta=eta,
+            generator=generator,
+            latents=latents,
+            output_type=output_type,
+            return_dict=return_dict,
+            callback=callback,
+            callback_steps=callback_steps,
+        )
+
+    @torch.no_grad()
+    def text_to_image(
+        self,
+        prompt: Union[str, List[str]],
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Examples:
+
+        ```py
+        >>> from diffusers import VersatileDiffusionPipeline
+        >>> import torch
+
+        >>> pipe = VersatileDiffusionPipeline.from_pretrained(
+        ...     "shi-labs/versatile-diffusion", torch_dtype=torch.float16
+        ... )
+        >>> pipe = pipe.to("cuda")
+
+        >>> generator = torch.Generator(device="cuda").manual_seed(0)
+        >>> image = pipe.text_to_image("an astronaut riding on a horse on mars", generator=generator).images[0]
+        >>> image.save("./astronaut.png")
+        ```
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+        expected_components = inspect.signature(VersatileDiffusionTextToImagePipeline.__init__).parameters.keys()
+        components = {name: component for name, component in self.components.items() if name in expected_components}
+        temp_pipeline = VersatileDiffusionTextToImagePipeline(**components)
+        output = temp_pipeline(
+            prompt=prompt,
+            height=height,
+            width=width,
+            num_inference_steps=num_inference_steps,
+            guidance_scale=guidance_scale,
+            negative_prompt=negative_prompt,
+            num_images_per_prompt=num_images_per_prompt,
+            eta=eta,
+            generator=generator,
+            latents=latents,
+            output_type=output_type,
+            return_dict=return_dict,
+            callback=callback,
+            callback_steps=callback_steps,
+        )
+        # swap the attention blocks back to the original state
+        temp_pipeline._swap_unet_attention_blocks()
+
+        return output
+
+    @torch.no_grad()
+    def dual_guided(
+        self,
+        prompt: Union[PIL.Image.Image, List[PIL.Image.Image]],
+        image: Union[str, List[str]],
+        text_to_image_strength: float = 0.5,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Examples:
+
+        ```py
+        >>> from diffusers import VersatileDiffusionPipeline
+        >>> import torch
+        >>> import requests
+        >>> from io import BytesIO
+        >>> from PIL import Image
+
+        >>> # let's download an initial image
+        >>> url = "https://huggingface.co/datasets/diffusers/images/resolve/main/benz.jpg"
+
+        >>> response = requests.get(url)
+        >>> image = Image.open(BytesIO(response.content)).convert("RGB")
+        >>> text = "a red car in the sun"
+
+        >>> pipe = VersatileDiffusionPipeline.from_pretrained(
+        ...     "shi-labs/versatile-diffusion", torch_dtype=torch.float16
+        ... )
+        >>> pipe = pipe.to("cuda")
+
+        >>> generator = torch.Generator(device="cuda").manual_seed(0)
+        >>> text_to_image_strength = 0.75
+
+        >>> image = pipe.dual_guided(
+        ...     prompt=text, image=image, text_to_image_strength=text_to_image_strength, generator=generator
+        ... ).images[0]
+        >>> image.save("./car_variation.png")
+        ```
+
+        Returns:
+            [`~pipelines.stable_diffusion.ImagePipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.ImagePipelineOutput`] if `return_dict` is True, otherwise a `tuple. When
+            returning a tuple, the first element is a list with the generated images.
+        """
+
+        expected_components = inspect.signature(VersatileDiffusionDualGuidedPipeline.__init__).parameters.keys()
+        components = {name: component for name, component in self.components.items() if name in expected_components}
+        temp_pipeline = VersatileDiffusionDualGuidedPipeline(**components)
+        output = temp_pipeline(
+            prompt=prompt,
+            image=image,
+            text_to_image_strength=text_to_image_strength,
+            height=height,
+            width=width,
+            num_inference_steps=num_inference_steps,
+            guidance_scale=guidance_scale,
+            num_images_per_prompt=num_images_per_prompt,
+            eta=eta,
+            generator=generator,
+            latents=latents,
+            output_type=output_type,
+            return_dict=return_dict,
+            callback=callback,
+            callback_steps=callback_steps,
+        )
+        temp_pipeline._revert_dual_attention()
+
+        return output

src/diffusers/pipelines/versatile_diffusion/pipeline_versatile_diffusion_dual_guided.py

@@ -0,0 +1,641 @@
+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import inspect
+from typing import Callable, List, Optional, Tuple, Union
+
+import numpy as np
+import torch
+import torch.utils.checkpoint
+
+import PIL
+from transformers import (
+    CLIPFeatureExtractor,
+    CLIPTextModelWithProjection,
+    CLIPTokenizer,
+    CLIPVisionModelWithProjection,
+)
+
+from ...models import AutoencoderKL, UNet2DConditionModel
+from ...models.attention import DualTransformer2DModel, Transformer2DModel
+from ...pipeline_utils import DiffusionPipeline, ImagePipelineOutput
+from ...schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
+from ...utils import is_accelerate_available, logging
+from .modeling_text_unet import UNetFlatConditionModel
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+class VersatileDiffusionDualGuidedPipeline(DiffusionPipeline):
+    r"""
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Parameters:
+        vqvae ([`VQModel`]):
+            Vector-quantized (VQ) Model to encode and decode images to and from latent representations.
+        bert ([`LDMBertModel`]):
+            Text-encoder model based on [BERT](https://huggingface.co/docs/transformers/model_doc/bert) architecture.
+        tokenizer (`transformers.BertTokenizer`):
+            Tokenizer of class
+            [BertTokenizer](https://huggingface.co/docs/transformers/model_doc/bert#transformers.BertTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+    """
+    tokenizer: CLIPTokenizer
+    image_feature_extractor: CLIPFeatureExtractor
+    text_encoder: CLIPTextModelWithProjection
+    image_encoder: CLIPVisionModelWithProjection
+    image_unet: UNet2DConditionModel
+    text_unet: UNetFlatConditionModel
+    vae: AutoencoderKL
+    scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler]
+
+    _optional_components = ["text_unet"]
+
+    def __init__(
+        self,
+        tokenizer: CLIPTokenizer,
+        image_feature_extractor: CLIPFeatureExtractor,
+        text_encoder: CLIPTextModelWithProjection,
+        image_encoder: CLIPVisionModelWithProjection,
+        image_unet: UNet2DConditionModel,
+        text_unet: UNetFlatConditionModel,
+        vae: AutoencoderKL,
+        scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
+    ):
+        super().__init__()
+        self.register_modules(
+            tokenizer=tokenizer,
+            image_feature_extractor=image_feature_extractor,
+            text_encoder=text_encoder,
+            image_encoder=image_encoder,
+            image_unet=image_unet,
+            text_unet=text_unet,
+            vae=vae,
+            scheduler=scheduler,
+        )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+
+        if self.text_unet is not None and (
+            "dual_cross_attention" not in self.image_unet.config or not self.image_unet.config.dual_cross_attention
+        ):
+            # if loading from a universal checkpoint rather than a saved dual-guided pipeline
+            self._convert_to_dual_attention()
+
+    def remove_unused_weights(self):
+        self.register_modules(text_unet=None)
+
+    def _convert_to_dual_attention(self):
+        """
+        Replace image_unet's `Transformer2DModel` blocks with `DualTransformer2DModel` that contains transformer blocks
+        from both `image_unet` and `text_unet`
+        """
+        for name, module in self.image_unet.named_modules():
+            if isinstance(module, Transformer2DModel):
+                parent_name, index = name.rsplit(".", 1)
+                index = int(index)
+
+                image_transformer = self.image_unet.get_submodule(parent_name)[index]
+                text_transformer = self.text_unet.get_submodule(parent_name)[index]
+
+                config = image_transformer.config
+                dual_transformer = DualTransformer2DModel(
+                    num_attention_heads=config.num_attention_heads,
+                    attention_head_dim=config.attention_head_dim,
+                    in_channels=config.in_channels,
+                    num_layers=config.num_layers,
+                    dropout=config.dropout,
+                    norm_num_groups=config.norm_num_groups,
+                    cross_attention_dim=config.cross_attention_dim,
+                    attention_bias=config.attention_bias,
+                    sample_size=config.sample_size,
+                    num_vector_embeds=config.num_vector_embeds,
+                    activation_fn=config.activation_fn,
+                    num_embeds_ada_norm=config.num_embeds_ada_norm,
+                )
+                dual_transformer.transformers[0] = image_transformer
+                dual_transformer.transformers[1] = text_transformer
+
+                self.image_unet.get_submodule(parent_name)[index] = dual_transformer
+                self.image_unet.register_to_config(dual_cross_attention=True)
+
+    def _revert_dual_attention(self):
+        """
+        Revert the image_unet `DualTransformer2DModel` blocks back to `Transformer2DModel` with image_unet weights Call
+        this function if you reuse `image_unet` in another pipeline, e.g. `VersatileDiffusionPipeline`
+        """
+        for name, module in self.image_unet.named_modules():
+            if isinstance(module, DualTransformer2DModel):
+                parent_name, index = name.rsplit(".", 1)
+                index = int(index)
+                self.image_unet.get_submodule(parent_name)[index] = module.transformers[0]
+
+        self.image_unet.register_to_config(dual_cross_attention=False)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_xformers_memory_efficient_attention with unet->image_unet
+    def enable_xformers_memory_efficient_attention(self):
+        r"""
+        Enable memory efficient attention as implemented in xformers.
+
+        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
+        time. Speed up at training time is not guaranteed.
+
+        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
+        is used.
+        """
+        self.image_unet.set_use_memory_efficient_attention_xformers(True)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_xformers_memory_efficient_attention with unet->image_unet
+    def disable_xformers_memory_efficient_attention(self):
+        r"""
+        Disable memory efficient attention as implemented in xformers.
+        """
+        self.image_unet.set_use_memory_efficient_attention_xformers(False)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing with unet->image_unet
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            if isinstance(self.image_unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.image_unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.image_unet.config.attention_head_dim)
+
+        self.image_unet.set_attention_slice(slice_size)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    def enable_sequential_cpu_offload(self, gpu_id=0):
+        r"""
+        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
+        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
+        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
+        """
+        if is_accelerate_available():
+            from accelerate import cpu_offload
+        else:
+            raise ImportError("Please install accelerate via `pip install accelerate`")
+
+        device = torch.device(f"cuda:{gpu_id}")
+
+        for cpu_offloaded_model in [self.image_unet, self.text_unet, self.text_encoder, self.vae]:
+            if cpu_offloaded_model is not None:
+                cpu_offload(cpu_offloaded_model, device)
+
+    @property
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device with unet->image_unet
+    def _execution_device(self):
+        r"""
+        Returns the device on which the pipeline's models will be executed. After calling
+        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
+        hooks.
+        """
+        if self.device != torch.device("meta") or not hasattr(self.image_unet, "_hf_hook"):
+            return self.device
+        for module in self.image_unet.modules():
+            if (
+                hasattr(module, "_hf_hook")
+                and hasattr(module._hf_hook, "execution_device")
+                and module._hf_hook.execution_device is not None
+            ):
+                return torch.device(module._hf_hook.execution_device)
+        return self.device
+
+    def _encode_text_prompt(self, prompt, device, num_images_per_prompt, do_classifier_free_guidance):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            device: (`torch.device`):
+                torch device
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+        """
+
+        def normalize_embeddings(encoder_output):
+            embeds = self.text_encoder.text_projection(encoder_output.last_hidden_state)
+            embeds_pooled = encoder_output.text_embeds
+            embeds = embeds / torch.norm(embeds_pooled.unsqueeze(1), dim=-1, keepdim=True)
+            return embeds
+
+        batch_size = len(prompt)
+
+        text_inputs = self.tokenizer(
+            prompt,
+            padding="max_length",
+            max_length=self.tokenizer.model_max_length,
+            truncation=True,
+            return_tensors="pt",
+        )
+        text_input_ids = text_inputs.input_ids
+        untruncated_ids = self.tokenizer(prompt, padding="max_length", return_tensors="pt").input_ids
+
+        if not torch.equal(text_input_ids, untruncated_ids):
+            removed_text = self.tokenizer.batch_decode(untruncated_ids[:, self.tokenizer.model_max_length - 1 : -1])
+            logger.warning(
+                "The following part of your input was truncated because CLIP can only handle sequences up to"
+                f" {self.tokenizer.model_max_length} tokens: {removed_text}"
+            )
+
+        if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+            attention_mask = text_inputs.attention_mask.to(device)
+        else:
+            attention_mask = None
+
+        text_embeddings = self.text_encoder(
+            text_input_ids.to(device),
+            attention_mask=attention_mask,
+        )
+        text_embeddings = normalize_embeddings(text_embeddings)
+
+        # duplicate text embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = text_embeddings.shape
+        text_embeddings = text_embeddings.repeat(1, num_images_per_prompt, 1)
+        text_embeddings = text_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_tokens = [""] * batch_size
+            max_length = text_input_ids.shape[-1]
+            uncond_input = self.tokenizer(
+                uncond_tokens,
+                padding="max_length",
+                max_length=max_length,
+                truncation=True,
+                return_tensors="pt",
+            )
+
+            if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+                attention_mask = uncond_input.attention_mask.to(device)
+            else:
+                attention_mask = None
+
+            uncond_embeddings = self.text_encoder(
+                uncond_input.input_ids.to(device),
+                attention_mask=attention_mask,
+            )
+            uncond_embeddings = normalize_embeddings(uncond_embeddings)
+
+            # duplicate unconditional embeddings for each generation per prompt, using mps friendly method
+            seq_len = uncond_embeddings.shape[1]
+            uncond_embeddings = uncond_embeddings.repeat(1, num_images_per_prompt, 1)
+            uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and text embeddings into a single batch
+            # to avoid doing two forward passes
+            text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
+
+        return text_embeddings
+
+    def _encode_image_prompt(self, prompt, device, num_images_per_prompt, do_classifier_free_guidance):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            device: (`torch.device`):
+                torch device
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+        """
+
+        def normalize_embeddings(encoder_output):
+            embeds = self.image_encoder.vision_model.post_layernorm(encoder_output.last_hidden_state)
+            embeds = self.image_encoder.visual_projection(embeds)
+            embeds_pooled = embeds[:, 0:1]
+            embeds = embeds / torch.norm(embeds_pooled, dim=-1, keepdim=True)
+            return embeds
+
+        batch_size = len(prompt) if isinstance(prompt, list) else 1
+
+        # get prompt text embeddings
+        image_input = self.image_feature_extractor(images=prompt, return_tensors="pt")
+        pixel_values = image_input.pixel_values.to(device).to(self.image_encoder.dtype)
+        image_embeddings = self.image_encoder(pixel_values)
+        image_embeddings = normalize_embeddings(image_embeddings)
+
+        # duplicate image embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = image_embeddings.shape
+        image_embeddings = image_embeddings.repeat(1, num_images_per_prompt, 1)
+        image_embeddings = image_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_images = [np.zeros((512, 512, 3)) + 0.5] * batch_size
+            uncond_images = self.image_feature_extractor(images=uncond_images, return_tensors="pt")
+            pixel_values = uncond_images.pixel_values.to(device).to(self.image_encoder.dtype)
+            uncond_embeddings = self.image_encoder(pixel_values)
+            uncond_embeddings = normalize_embeddings(uncond_embeddings)
+
+            # duplicate unconditional embeddings for each generation per prompt, using mps friendly method
+            seq_len = uncond_embeddings.shape[1]
+            uncond_embeddings = uncond_embeddings.repeat(1, num_images_per_prompt, 1)
+            uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and conditional embeddings into a single batch
+            # to avoid doing two forward passes
+            image_embeddings = torch.cat([uncond_embeddings, image_embeddings])
+
+        return image_embeddings
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.decode_latents
+    def decode_latents(self, latents):
+        latents = 1 / 0.18215 * latents
+        image = self.vae.decode(latents).sample
+        image = (image / 2 + 0.5).clamp(0, 1)
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
+        return image
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_extra_step_kwargs
+    def prepare_extra_step_kwargs(self, generator, eta):
+        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
+        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
+        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
+        # and should be between [0, 1]
+
+        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        extra_step_kwargs = {}
+        if accepts_eta:
+            extra_step_kwargs["eta"] = eta
+
+        # check if the scheduler accepts generator
+        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        if accepts_generator:
+            extra_step_kwargs["generator"] = generator
+        return extra_step_kwargs
+
+    def check_inputs(self, prompt, image, height, width, callback_steps):
+        if not isinstance(prompt, str) and not isinstance(prompt, PIL.Image.Image) and not isinstance(prompt, list):
+            raise ValueError(f"`prompt` has to be of type `str` `PIL.Image` or `list` but is {type(prompt)}")
+        if not isinstance(image, str) and not isinstance(image, PIL.Image.Image) and not isinstance(image, list):
+            raise ValueError(f"`image` has to be of type `str` `PIL.Image` or `list` but is {type(image)}")
+
+        if height % 8 != 0 or width % 8 != 0:
+            raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_latents
+    def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
+        if latents is None:
+            if device.type == "mps":
+                # randn does not work reproducibly on mps
+                latents = torch.randn(shape, generator=generator, device="cpu", dtype=dtype).to(device)
+            else:
+                latents = torch.randn(shape, generator=generator, device=device, dtype=dtype)
+        else:
+            if latents.shape != shape:
+                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {shape}")
+            latents = latents.to(device)
+
+        # scale the initial noise by the standard deviation required by the scheduler
+        latents = latents * self.scheduler.init_noise_sigma
+        return latents
+
+    def set_transformer_params(self, mix_ratio: float = 0.5, condition_types: Tuple = ("text", "image")):
+        for name, module in self.image_unet.named_modules():
+            if isinstance(module, DualTransformer2DModel):
+                module.mix_ratio = mix_ratio
+
+                for i, type in enumerate(condition_types):
+                    if type == "text":
+                        module.condition_lengths[i] = self.text_encoder.config.max_position_embeddings
+                        module.transformer_index_for_condition[i] = 1  # use the second (text) transformer
+                    else:
+                        module.condition_lengths[i] = 257
+                        module.transformer_index_for_condition[i] = 0  # use the first (image) transformer
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        prompt: Union[PIL.Image.Image, List[PIL.Image.Image]],
+        image: Union[str, List[str]],
+        text_to_image_strength: float = 0.5,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+        **kwargs,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Examples:
+
+        ```py
+        >>> from diffusers import VersatileDiffusionDualGuidedPipeline
+        >>> import torch
+        >>> import requests
+        >>> from io import BytesIO
+        >>> from PIL import Image
+
+        >>> # let's download an initial image
+        >>> url = "https://huggingface.co/datasets/diffusers/images/resolve/main/benz.jpg"
+
+        >>> response = requests.get(url)
+        >>> image = Image.open(BytesIO(response.content)).convert("RGB")
+        >>> text = "a red car in the sun"
+
+        >>> pipe = VersatileDiffusionDualGuidedPipeline.from_pretrained(
+        ...     "shi-labs/versatile-diffusion", torch_dtype=torch.float16
+        ... )
+        >>> pipe.remove_unused_weights()
+        >>> pipe = pipe.to("cuda")
+
+        >>> generator = torch.Generator(device="cuda").manual_seed(0)
+        >>> text_to_image_strength = 0.75
+
+        >>> image = pipe(
+        ...     prompt=text, image=image, text_to_image_strength=text_to_image_strength, generator=generator
+        ... ).images[0]
+        >>> image.save("./car_variation.png")
+        ```
+
+        Returns:
+            [`~pipelines.stable_diffusion.ImagePipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.ImagePipelineOutput`] if `return_dict` is True, otherwise a `tuple. When
+            returning a tuple, the first element is a list with the generated images.
+        """
+        # 0. Default height and width to unet
+        height = height or self.image_unet.config.sample_size * self.vae_scale_factor
+        width = width or self.image_unet.config.sample_size * self.vae_scale_factor
+
+        # 1. Check inputs. Raise error if not correct
+        self.check_inputs(prompt, image, height, width, callback_steps)
+
+        # 2. Define call parameters
+        prompt = [prompt] if not isinstance(prompt, list) else prompt
+        image = [image] if not isinstance(image, list) else image
+        batch_size = len(prompt)
+        device = self._execution_device
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        # 3. Encode input prompts
+        text_embeddings = self._encode_text_prompt(prompt, device, num_images_per_prompt, do_classifier_free_guidance)
+        image_embeddings = self._encode_image_prompt(image, device, num_images_per_prompt, do_classifier_free_guidance)
+        dual_prompt_embeddings = torch.cat([text_embeddings, image_embeddings], dim=1)
+        prompt_types = ("text", "image")
+
+        # 4. Prepare timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=device)
+        timesteps = self.scheduler.timesteps
+
+        # 5. Prepare latent variables
+        num_channels_latents = self.image_unet.in_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            dual_prompt_embeddings.dtype,
+            device,
+            generator,
+            latents,
+        )
+
+        # 6. Prepare extra step kwargs.
+        extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
+
+        # 7. Combine the attention blocks of the image and text UNets
+        self.set_transformer_params(text_to_image_strength, prompt_types)
+
+        # 8. Denoising loop
+        for i, t in enumerate(self.progress_bar(timesteps)):
+            # expand the latents if we are doing classifier free guidance
+            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+
+            # predict the noise residual
+            noise_pred = self.image_unet(latent_model_input, t, encoder_hidden_states=dual_prompt_embeddings).sample
+
+            # perform guidance
+            if do_classifier_free_guidance:
+                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+
+            # compute the previous noisy sample x_t -> x_t-1
+            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+
+            # call the callback, if provided
+            if callback is not None and i % callback_steps == 0:
+                callback(i, t, latents)
+
+        # 9. Post-processing
+        image = self.decode_latents(latents)
+
+        # 10. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image,)
+
+        return ImagePipelineOutput(images=image)

src/diffusers/pipelines/versatile_diffusion/pipeline_versatile_diffusion_image_variation.py

@@ -0,0 +1,471 @@
+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import inspect
+from typing import Callable, List, Optional, Union
+
+import numpy as np
+import torch
+import torch.utils.checkpoint
+
+import PIL
+from transformers import CLIPFeatureExtractor, CLIPVisionModelWithProjection
+
+from ...models import AutoencoderKL, UNet2DConditionModel
+from ...pipeline_utils import DiffusionPipeline, ImagePipelineOutput
+from ...schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
+from ...utils import is_accelerate_available, logging
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+class VersatileDiffusionImageVariationPipeline(DiffusionPipeline):
+    r"""
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Parameters:
+        vqvae ([`VQModel`]):
+            Vector-quantized (VQ) Model to encode and decode images to and from latent representations.
+        bert ([`LDMBertModel`]):
+            Text-encoder model based on [BERT](https://huggingface.co/docs/transformers/model_doc/bert) architecture.
+        tokenizer (`transformers.BertTokenizer`):
+            Tokenizer of class
+            [BertTokenizer](https://huggingface.co/docs/transformers/model_doc/bert#transformers.BertTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+    """
+    image_feature_extractor: CLIPFeatureExtractor
+    image_encoder: CLIPVisionModelWithProjection
+    image_unet: UNet2DConditionModel
+    vae: AutoencoderKL
+    scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler]
+
+    def __init__(
+        self,
+        image_feature_extractor: CLIPFeatureExtractor,
+        image_encoder: CLIPVisionModelWithProjection,
+        image_unet: UNet2DConditionModel,
+        vae: AutoencoderKL,
+        scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
+    ):
+        super().__init__()
+        self.register_modules(
+            image_feature_extractor=image_feature_extractor,
+            image_encoder=image_encoder,
+            image_unet=image_unet,
+            vae=vae,
+            scheduler=scheduler,
+        )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_xformers_memory_efficient_attention with unet->image_unet
+    def enable_xformers_memory_efficient_attention(self):
+        r"""
+        Enable memory efficient attention as implemented in xformers.
+
+        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
+        time. Speed up at training time is not guaranteed.
+
+        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
+        is used.
+        """
+        self.image_unet.set_use_memory_efficient_attention_xformers(True)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_xformers_memory_efficient_attention with unet->image_unet
+    def disable_xformers_memory_efficient_attention(self):
+        r"""
+        Disable memory efficient attention as implemented in xformers.
+        """
+        self.image_unet.set_use_memory_efficient_attention_xformers(False)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing with unet->image_unet
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            if isinstance(self.image_unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.image_unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.image_unet.config.attention_head_dim)
+
+        self.image_unet.set_attention_slice(slice_size)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    def enable_sequential_cpu_offload(self, gpu_id=0):
+        r"""
+        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
+        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
+        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
+        """
+        if is_accelerate_available():
+            from accelerate import cpu_offload
+        else:
+            raise ImportError("Please install accelerate via `pip install accelerate`")
+
+        device = torch.device(f"cuda:{gpu_id}")
+
+        for cpu_offloaded_model in [self.image_unet, self.text_unet, self.text_encoder, self.vae]:
+            if cpu_offloaded_model is not None:
+                cpu_offload(cpu_offloaded_model, device)
+
+    @property
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device with unet->image_unet
+    def _execution_device(self):
+        r"""
+        Returns the device on which the pipeline's models will be executed. After calling
+        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
+        hooks.
+        """
+        if self.device != torch.device("meta") or not hasattr(self.image_unet, "_hf_hook"):
+            return self.device
+        for module in self.image_unet.modules():
+            if (
+                hasattr(module, "_hf_hook")
+                and hasattr(module._hf_hook, "execution_device")
+                and module._hf_hook.execution_device is not None
+            ):
+                return torch.device(module._hf_hook.execution_device)
+        return self.device
+
+    def _encode_prompt(self, prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            device: (`torch.device`):
+                torch device
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+            negative_prompt (`str` or `List[str]`):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+        """
+
+        def normalize_embeddings(encoder_output):
+            embeds = self.image_encoder.vision_model.post_layernorm(encoder_output.last_hidden_state)
+            embeds = self.image_encoder.visual_projection(embeds)
+            embeds_pooled = embeds[:, 0:1]
+            embeds = embeds / torch.norm(embeds_pooled, dim=-1, keepdim=True)
+            return embeds
+
+        batch_size = len(prompt) if isinstance(prompt, list) else 1
+
+        # get prompt text embeddings
+        image_input = self.image_feature_extractor(images=prompt, return_tensors="pt")
+        pixel_values = image_input.pixel_values.to(device).to(self.image_encoder.dtype)
+        image_embeddings = self.image_encoder(pixel_values)
+        image_embeddings = normalize_embeddings(image_embeddings)
+
+        # duplicate image embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = image_embeddings.shape
+        image_embeddings = image_embeddings.repeat(1, num_images_per_prompt, 1)
+        image_embeddings = image_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_images: List[str]
+            if negative_prompt is None:
+                uncond_images = [np.zeros((512, 512, 3)) + 0.5] * batch_size
+            elif type(prompt) is not type(negative_prompt):
+                raise TypeError(
+                    f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
+                    f" {type(prompt)}."
+                )
+            elif isinstance(negative_prompt, PIL.Image.Image):
+                uncond_images = [negative_prompt]
+            elif batch_size != len(negative_prompt):
+                raise ValueError(
+                    f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:"
+                    f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches"
+                    " the batch size of `prompt`."
+                )
+            else:
+                uncond_images = negative_prompt
+
+            uncond_images = self.image_feature_extractor(images=uncond_images, return_tensors="pt")
+            pixel_values = uncond_images.pixel_values.to(device).to(self.image_encoder.dtype)
+            uncond_embeddings = self.image_encoder(pixel_values)
+            uncond_embeddings = normalize_embeddings(uncond_embeddings)
+
+            # duplicate unconditional embeddings for each generation per prompt, using mps friendly method
+            seq_len = uncond_embeddings.shape[1]
+            uncond_embeddings = uncond_embeddings.repeat(1, num_images_per_prompt, 1)
+            uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and conditional embeddings into a single batch
+            # to avoid doing two forward passes
+            image_embeddings = torch.cat([uncond_embeddings, image_embeddings])
+
+        return image_embeddings
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.decode_latents
+    def decode_latents(self, latents):
+        latents = 1 / 0.18215 * latents
+        image = self.vae.decode(latents).sample
+        image = (image / 2 + 0.5).clamp(0, 1)
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
+        return image
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_extra_step_kwargs
+    def prepare_extra_step_kwargs(self, generator, eta):
+        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
+        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
+        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
+        # and should be between [0, 1]
+
+        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        extra_step_kwargs = {}
+        if accepts_eta:
+            extra_step_kwargs["eta"] = eta
+
+        # check if the scheduler accepts generator
+        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        if accepts_generator:
+            extra_step_kwargs["generator"] = generator
+        return extra_step_kwargs
+
+    def check_inputs(self, image, height, width, callback_steps):
+        if not isinstance(image, PIL.Image.Image) and not isinstance(image, torch.Tensor):
+            raise ValueError(f"`image` has to be of type `PIL.Image.Image` or `torch.Tensor` but is {type(image)}")
+
+        if height % 8 != 0 or width % 8 != 0:
+            raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_latents
+    def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
+        if latents is None:
+            if device.type == "mps":
+                # randn does not work reproducibly on mps
+                latents = torch.randn(shape, generator=generator, device="cpu", dtype=dtype).to(device)
+            else:
+                latents = torch.randn(shape, generator=generator, device=device, dtype=dtype)
+        else:
+            if latents.shape != shape:
+                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {shape}")
+            latents = latents.to(device)
+
+        # scale the initial noise by the standard deviation required by the scheduler
+        latents = latents * self.scheduler.init_noise_sigma
+        return latents
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        image: Union[PIL.Image.Image, List[PIL.Image.Image], torch.Tensor],
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+        **kwargs,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            image (`PIL.Image.Image`, `List[PIL.Image.Image]` or `torch.Tensor`):
+                The image prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Examples:
+
+        ```py
+        >>> from diffusers import VersatileDiffusionImageVariationPipeline
+        >>> import torch
+        >>> import requests
+        >>> from io import BytesIO
+        >>> from PIL import Image
+
+        >>> # let's download an initial image
+        >>> url = "https://huggingface.co/datasets/diffusers/images/resolve/main/benz.jpg"
+
+        >>> response = requests.get(url)
+        >>> image = Image.open(BytesIO(response.content)).convert("RGB")
+
+        >>> pipe = VersatileDiffusionImageVariationPipeline.from_pretrained(
+        ...     "shi-labs/versatile-diffusion", torch_dtype=torch.float16
+        ... )
+        >>> pipe = pipe.to("cuda")
+
+        >>> generator = torch.Generator(device="cuda").manual_seed(0)
+        >>> image = pipe(image, generator=generator).images[0]
+        >>> image.save("./car_variation.png")
+        ```
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+        # 0. Default height and width to unet
+        height = height or self.image_unet.config.sample_size * self.vae_scale_factor
+        width = width or self.image_unet.config.sample_size * self.vae_scale_factor
+
+        # 1. Check inputs. Raise error if not correct
+        self.check_inputs(image, height, width, callback_steps)
+
+        # 2. Define call parameters
+        batch_size = 1 if isinstance(image, PIL.Image.Image) else len(image)
+        device = self._execution_device
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        # 3. Encode input prompt
+        image_embeddings = self._encode_prompt(
+            image, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt
+        )
+
+        # 4. Prepare timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=device)
+        timesteps = self.scheduler.timesteps
+
+        # 5. Prepare latent variables
+        num_channels_latents = self.image_unet.in_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            image_embeddings.dtype,
+            device,
+            generator,
+            latents,
+        )
+
+        # 6. Prepare extra step kwargs.
+        extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
+
+        # 7. Denoising loop
+        for i, t in enumerate(self.progress_bar(timesteps)):
+            # expand the latents if we are doing classifier free guidance
+            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+
+            # predict the noise residual
+            noise_pred = self.image_unet(latent_model_input, t, encoder_hidden_states=image_embeddings).sample
+
+            # perform guidance
+            if do_classifier_free_guidance:
+                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+
+            # compute the previous noisy sample x_t -> x_t-1
+            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+
+            # call the callback, if provided
+            if callback is not None and i % callback_steps == 0:
+                callback(i, t, latents)
+
+        # 8. Post-processing
+        image = self.decode_latents(latents)
+
+        # 9. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image,)
+
+        return ImagePipelineOutput(images=image)

src/diffusers/pipelines/versatile_diffusion/pipeline_versatile_diffusion_text_to_image.py

@@ -0,0 +1,525 @@
+# Copyright 2022 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import inspect
+from typing import Callable, List, Optional, Union
+
+import torch
+import torch.utils.checkpoint
+
+from transformers import CLIPFeatureExtractor, CLIPTextModelWithProjection, CLIPTokenizer
+
+from ...models import AutoencoderKL, UNet2DConditionModel
+from ...models.attention import Transformer2DModel
+from ...pipeline_utils import DiffusionPipeline, ImagePipelineOutput
+from ...schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
+from ...utils import is_accelerate_available, logging
+from .modeling_text_unet import UNetFlatConditionModel
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+
+class VersatileDiffusionTextToImagePipeline(DiffusionPipeline):
+    r"""
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Parameters:
+        vqvae ([`VQModel`]):
+            Vector-quantized (VQ) Model to encode and decode images to and from latent representations.
+        bert ([`LDMBertModel`]):
+            Text-encoder model based on [BERT](https://huggingface.co/docs/transformers/model_doc/bert) architecture.
+        tokenizer (`transformers.BertTokenizer`):
+            Tokenizer of class
+            [BertTokenizer](https://huggingface.co/docs/transformers/model_doc/bert#transformers.BertTokenizer).
+        unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
+            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
+    """
+    tokenizer: CLIPTokenizer
+    image_feature_extractor: CLIPFeatureExtractor
+    text_encoder: CLIPTextModelWithProjection
+    image_unet: UNet2DConditionModel
+    text_unet: UNetFlatConditionModel
+    vae: AutoencoderKL
+    scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler]
+
+    _optional_components = ["text_unet"]
+
+    def __init__(
+        self,
+        tokenizer: CLIPTokenizer,
+        text_encoder: CLIPTextModelWithProjection,
+        image_unet: UNet2DConditionModel,
+        text_unet: UNetFlatConditionModel,
+        vae: AutoencoderKL,
+        scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
+    ):
+        super().__init__()
+        self.register_modules(
+            tokenizer=tokenizer,
+            text_encoder=text_encoder,
+            image_unet=image_unet,
+            text_unet=text_unet,
+            vae=vae,
+            scheduler=scheduler,
+        )
+        self.vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
+
+        if self.text_unet is not None:
+            self._swap_unet_attention_blocks()
+
+    def _swap_unet_attention_blocks(self):
+        """
+        Swap the `Transformer2DModel` blocks between the image and text UNets
+        """
+        for name, module in self.image_unet.named_modules():
+            if isinstance(module, Transformer2DModel):
+                parent_name, index = name.rsplit(".", 1)
+                index = int(index)
+                self.image_unet.get_submodule(parent_name)[index], self.text_unet.get_submodule(parent_name)[index] = (
+                    self.text_unet.get_submodule(parent_name)[index],
+                    self.image_unet.get_submodule(parent_name)[index],
+                )
+
+    def remove_unused_weights(self):
+        self.register_modules(text_unet=None)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_xformers_memory_efficient_attention with unet->image_unet
+    def enable_xformers_memory_efficient_attention(self):
+        r"""
+        Enable memory efficient attention as implemented in xformers.
+
+        When this option is enabled, you should observe lower GPU memory usage and a potential speed up at inference
+        time. Speed up at training time is not guaranteed.
+
+        Warning: When Memory Efficient Attention and Sliced attention are both enabled, the Memory Efficient Attention
+        is used.
+        """
+        self.image_unet.set_use_memory_efficient_attention_xformers(True)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_xformers_memory_efficient_attention with unet->image_unet
+    def disable_xformers_memory_efficient_attention(self):
+        r"""
+        Disable memory efficient attention as implemented in xformers.
+        """
+        self.image_unet.set_use_memory_efficient_attention_xformers(False)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.enable_attention_slicing with unet->image_unet
+    def enable_attention_slicing(self, slice_size: Optional[Union[str, int]] = "auto"):
+        r"""
+        Enable sliced attention computation.
+
+        When this option is enabled, the attention module will split the input tensor in slices, to compute attention
+        in several steps. This is useful to save some memory in exchange for a small speed decrease.
+
+        Args:
+            slice_size (`str` or `int`, *optional*, defaults to `"auto"`):
+                When `"auto"`, halves the input to the attention heads, so attention will be computed in two steps. If
+                a number is provided, uses as many slices as `attention_head_dim // slice_size`. In this case,
+                `attention_head_dim` must be a multiple of `slice_size`.
+        """
+        if slice_size == "auto":
+            if isinstance(self.image_unet.config.attention_head_dim, int):
+                # half the attention head size is usually a good trade-off between
+                # speed and memory
+                slice_size = self.image_unet.config.attention_head_dim // 2
+            else:
+                # if `attention_head_dim` is a list, take the smallest head size
+                slice_size = min(self.image_unet.config.attention_head_dim)
+
+        self.image_unet.set_attention_slice(slice_size)
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.disable_attention_slicing
+    def disable_attention_slicing(self):
+        r"""
+        Disable sliced attention computation. If `enable_attention_slicing` was previously invoked, this method will go
+        back to computing attention in one step.
+        """
+        # set slice_size = `None` to disable `attention slicing`
+        self.enable_attention_slicing(None)
+
+    def enable_sequential_cpu_offload(self, gpu_id=0):
+        r"""
+        Offloads all models to CPU using accelerate, significantly reducing memory usage. When called, unet,
+        text_encoder, vae and safety checker have their state dicts saved to CPU and then are moved to a
+        `torch.device('meta') and loaded to GPU only when their specific submodule has its `forward` method called.
+        """
+        if is_accelerate_available():
+            from accelerate import cpu_offload
+        else:
+            raise ImportError("Please install accelerate via `pip install accelerate`")
+
+        device = torch.device(f"cuda:{gpu_id}")
+
+        for cpu_offloaded_model in [self.image_unet, self.text_unet, self.text_encoder, self.vae]:
+            if cpu_offloaded_model is not None:
+                cpu_offload(cpu_offloaded_model, device)
+
+    @property
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline._execution_device with unet->image_unet
+    def _execution_device(self):
+        r"""
+        Returns the device on which the pipeline's models will be executed. After calling
+        `pipeline.enable_sequential_cpu_offload()` the execution device can only be inferred from Accelerate's module
+        hooks.
+        """
+        if self.device != torch.device("meta") or not hasattr(self.image_unet, "_hf_hook"):
+            return self.device
+        for module in self.image_unet.modules():
+            if (
+                hasattr(module, "_hf_hook")
+                and hasattr(module._hf_hook, "execution_device")
+                and module._hf_hook.execution_device is not None
+            ):
+                return torch.device(module._hf_hook.execution_device)
+        return self.device
+
+    def _encode_prompt(self, prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt):
+        r"""
+        Encodes the prompt into text encoder hidden states.
+
+        Args:
+            prompt (`str` or `list(int)`):
+                prompt to be encoded
+            device: (`torch.device`):
+                torch device
+            num_images_per_prompt (`int`):
+                number of images that should be generated per prompt
+            do_classifier_free_guidance (`bool`):
+                whether to use classifier free guidance or not
+            negative_prompt (`str` or `List[str]`):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+        """
+
+        def normalize_embeddings(encoder_output):
+            embeds = self.text_encoder.text_projection(encoder_output.last_hidden_state)
+            embeds_pooled = encoder_output.text_embeds
+            embeds = embeds / torch.norm(embeds_pooled.unsqueeze(1), dim=-1, keepdim=True)
+            return embeds
+
+        batch_size = len(prompt) if isinstance(prompt, list) else 1
+
+        text_inputs = self.tokenizer(
+            prompt,
+            padding="max_length",
+            max_length=self.tokenizer.model_max_length,
+            truncation=True,
+            return_tensors="pt",
+        )
+        text_input_ids = text_inputs.input_ids
+        untruncated_ids = self.tokenizer(prompt, padding="max_length", return_tensors="pt").input_ids
+
+        if not torch.equal(text_input_ids, untruncated_ids):
+            removed_text = self.tokenizer.batch_decode(untruncated_ids[:, self.tokenizer.model_max_length - 1 : -1])
+            logger.warning(
+                "The following part of your input was truncated because CLIP can only handle sequences up to"
+                f" {self.tokenizer.model_max_length} tokens: {removed_text}"
+            )
+
+        if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+            attention_mask = text_inputs.attention_mask.to(device)
+        else:
+            attention_mask = None
+
+        text_embeddings = self.text_encoder(
+            text_input_ids.to(device),
+            attention_mask=attention_mask,
+        )
+        text_embeddings = normalize_embeddings(text_embeddings)
+
+        # duplicate text embeddings for each generation per prompt, using mps friendly method
+        bs_embed, seq_len, _ = text_embeddings.shape
+        text_embeddings = text_embeddings.repeat(1, num_images_per_prompt, 1)
+        text_embeddings = text_embeddings.view(bs_embed * num_images_per_prompt, seq_len, -1)
+
+        # get unconditional embeddings for classifier free guidance
+        if do_classifier_free_guidance:
+            uncond_tokens: List[str]
+            if negative_prompt is None:
+                uncond_tokens = [""] * batch_size
+            elif type(prompt) is not type(negative_prompt):
+                raise TypeError(
+                    f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
+                    f" {type(prompt)}."
+                )
+            elif isinstance(negative_prompt, str):
+                uncond_tokens = [negative_prompt]
+            elif batch_size != len(negative_prompt):
+                raise ValueError(
+                    f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:"
+                    f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches"
+                    " the batch size of `prompt`."
+                )
+            else:
+                uncond_tokens = negative_prompt
+
+            max_length = text_input_ids.shape[-1]
+            uncond_input = self.tokenizer(
+                uncond_tokens,
+                padding="max_length",
+                max_length=max_length,
+                truncation=True,
+                return_tensors="pt",
+            )
+
+            if hasattr(self.text_encoder.config, "use_attention_mask") and self.text_encoder.config.use_attention_mask:
+                attention_mask = uncond_input.attention_mask.to(device)
+            else:
+                attention_mask = None
+
+            uncond_embeddings = self.text_encoder(
+                uncond_input.input_ids.to(device),
+                attention_mask=attention_mask,
+            )
+            uncond_embeddings = normalize_embeddings(uncond_embeddings)
+
+            # duplicate unconditional embeddings for each generation per prompt, using mps friendly method
+            seq_len = uncond_embeddings.shape[1]
+            uncond_embeddings = uncond_embeddings.repeat(1, num_images_per_prompt, 1)
+            uncond_embeddings = uncond_embeddings.view(batch_size * num_images_per_prompt, seq_len, -1)
+
+            # For classifier free guidance, we need to do two forward passes.
+            # Here we concatenate the unconditional and text embeddings into a single batch
+            # to avoid doing two forward passes
+            text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
+
+        return text_embeddings
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.decode_latents
+    def decode_latents(self, latents):
+        latents = 1 / 0.18215 * latents
+        image = self.vae.decode(latents).sample
+        image = (image / 2 + 0.5).clamp(0, 1)
+        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloa16
+        image = image.cpu().permute(0, 2, 3, 1).float().numpy()
+        return image
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_extra_step_kwargs
+    def prepare_extra_step_kwargs(self, generator, eta):
+        # prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
+        # eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
+        # eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
+        # and should be between [0, 1]
+
+        accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        extra_step_kwargs = {}
+        if accepts_eta:
+            extra_step_kwargs["eta"] = eta
+
+        # check if the scheduler accepts generator
+        accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())
+        if accepts_generator:
+            extra_step_kwargs["generator"] = generator
+        return extra_step_kwargs
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.check_inputs
+    def check_inputs(self, prompt, height, width, callback_steps):
+        if not isinstance(prompt, str) and not isinstance(prompt, list):
+            raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
+
+        if height % 8 != 0 or width % 8 != 0:
+            raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
+
+        if (callback_steps is None) or (
+            callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
+        ):
+            raise ValueError(
+                f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
+                f" {type(callback_steps)}."
+            )
+
+    # Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.StableDiffusionPipeline.prepare_latents
+    def prepare_latents(self, batch_size, num_channels_latents, height, width, dtype, device, generator, latents=None):
+        shape = (batch_size, num_channels_latents, height // self.vae_scale_factor, width // self.vae_scale_factor)
+        if latents is None:
+            if device.type == "mps":
+                # randn does not work reproducibly on mps
+                latents = torch.randn(shape, generator=generator, device="cpu", dtype=dtype).to(device)
+            else:
+                latents = torch.randn(shape, generator=generator, device=device, dtype=dtype)
+        else:
+            if latents.shape != shape:
+                raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {shape}")
+            latents = latents.to(device)
+
+        # scale the initial noise by the standard deviation required by the scheduler
+        latents = latents * self.scheduler.init_noise_sigma
+        return latents
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        prompt: Union[str, List[str]],
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 7.5,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        num_images_per_prompt: Optional[int] = 1,
+        eta: float = 0.0,
+        generator: Optional[torch.Generator] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: Optional[int] = 1,
+        **kwargs,
+    ):
+        r"""
+        Function invoked when calling the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`):
+                The prompt or prompts to guide the image generation.
+            height (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The height in pixels of the generated image.
+            width (`int`, *optional*, defaults to self.image_unet.config.sample_size * self.vae_scale_factor):
+                The width in pixels of the generated image.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
+                `guidance_scale` is defined as `w` of equation 2. of [Imagen
+                Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
+                1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
+                usually at the expense of lower image quality.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
+                if `guidance_scale` is less than `1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
+                [`schedulers.DDIMScheduler`], will be ignored for others.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor will ge generated by sampling using the supplied random `generator`.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
+                plain tuple.
+            callback (`Callable`, *optional*):
+                A function that will be called every `callback_steps` steps during inference. The function will be
+                called with the following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function will be called. If not specified, the callback will be
+                called at every step.
+
+        Examples:
+
+        ```py
+        >>> from diffusers import VersatileDiffusionTextToImagePipeline
+        >>> import torch
+
+        >>> pipe = VersatileDiffusionTextToImagePipeline.from_pretrained(
+        ...     "shi-labs/versatile-diffusion", torch_dtype=torch.float16
+        ... )
+        >>> pipe.remove_unused_weights()
+        >>> pipe = pipe.to("cuda")
+
+        >>> generator = torch.Generator(device="cuda").manual_seed(0)
+        >>> image = pipe("an astronaut riding on a horse on mars", generator=generator).images[0]
+        >>> image.save("./astronaut.png")
+        ```
+
+        Returns:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
+            [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
+            When returning a tuple, the first element is a list with the generated images, and the second element is a
+            list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
+            (nsfw) content, according to the `safety_checker`.
+        """
+        # 0. Default height and width to unet
+        height = height or self.image_unet.config.sample_size * self.vae_scale_factor
+        width = width or self.image_unet.config.sample_size * self.vae_scale_factor
+
+        # 1. Check inputs. Raise error if not correct
+        self.check_inputs(prompt, height, width, callback_steps)
+
+        # 2. Define call parameters
+        batch_size = 1 if isinstance(prompt, str) else len(prompt)
+        device = self._execution_device
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        # 3. Encode input prompt
+        text_embeddings = self._encode_prompt(
+            prompt, device, num_images_per_prompt, do_classifier_free_guidance, negative_prompt
+        )
+
+        # 4. Prepare timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=device)
+        timesteps = self.scheduler.timesteps
+
+        # 5. Prepare latent variables
+        num_channels_latents = self.image_unet.in_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            height,
+            width,
+            text_embeddings.dtype,
+            device,
+            generator,
+            latents,
+        )
+
+        # 6. Prepare extra step kwargs.
+        extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
+
+        # 7. Denoising loop
+        for i, t in enumerate(self.progress_bar(timesteps)):
+            # expand the latents if we are doing classifier free guidance
+            latent_model_input = torch.cat([latents] * 2) if do_classifier_free_guidance else latents
+            latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+
+            # predict the noise residual
+            noise_pred = self.image_unet(latent_model_input, t, encoder_hidden_states=text_embeddings).sample
+
+            # perform guidance
+            if do_classifier_free_guidance:
+                noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
+                noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+
+            # compute the previous noisy sample x_t -> x_t-1
+            latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+
+            # call the callback, if provided
+            if callback is not None and i % callback_steps == 0:
+                callback(i, t, latents)
+
+        # 9. Post-processing
+        image = self.decode_latents(latents)
+
+        # 10. Convert to PIL
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image,)
+
+        return ImagePipelineOutput(images=image)

src/diffusers/schedulers/__init__.py

@@ -22,7 +22,10 @@ if is_torch_available():
     from .scheduling_dpmsolver_multistep import DPMSolverMultistepScheduler
     from .scheduling_euler_ancestral_discrete import EulerAncestralDiscreteScheduler
     from .scheduling_euler_discrete import EulerDiscreteScheduler
+    from .scheduling_heun_discrete import HeunDiscreteScheduler
     from .scheduling_ipndm import IPNDMScheduler
+    from .scheduling_k_dpm_2_ancestral_discrete import KDPM2AncestralDiscreteScheduler
+    from .scheduling_k_dpm_2_discrete import KDPM2DiscreteScheduler
     from .scheduling_karras_ve import KarrasVeScheduler
     from .scheduling_pndm import PNDMScheduler
     from .scheduling_repaint import RePaintScheduler

src/diffusers/schedulers/scheduling_ddim.py

@@ -17,13 +17,13 @@
 
 import math
 from dataclasses import dataclass
-from typing import Optional, Tuple, Union
+from typing import List, Optional, Tuple, Union
 
 import numpy as np
 import torch
 
 from ..configuration_utils import ConfigMixin, register_to_config
-from ..utils import _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS, BaseOutput
+from ..utils import _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS, BaseOutput, deprecate
 from .scheduling_utils import SchedulerMixin
 
 
@@ -106,10 +106,15 @@ class DDIMScheduler(SchedulerMixin, ConfigMixin):
             an offset added to the inference steps. You can use a combination of `offset=1` and
             `set_alpha_to_one=False`, to make the last step use step 0 for the previous alpha product, as done in
             stable diffusion.
+        prediction_type (`str`, default `epsilon`):
+            indicates whether the model predicts the noise (epsilon), or the samples. One of `epsilon`, `sample`.
+            `v-prediction` is not supported for this scheduler.
 
     """
 
     _compatibles = _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS.copy()
+    _deprecated_kwargs = ["predict_epsilon"]
+    order = 1
 
     @register_to_config
     def __init__(
@@ -118,13 +123,23 @@ class DDIMScheduler(SchedulerMixin, ConfigMixin):
         beta_start: float = 0.0001,
         beta_end: float = 0.02,
         beta_schedule: str = "linear",
-        trained_betas: Optional[np.ndarray] = None,
+        trained_betas: Optional[Union[np.ndarray, List[float]]] = None,
         clip_sample: bool = True,
         set_alpha_to_one: bool = True,
         steps_offset: int = 0,
+        prediction_type: str = "epsilon",
+        **kwargs,
     ):
+        message = (
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " DDIMScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
+        )
+        predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
+        if predict_epsilon is not None:
+            self.register_to_config(prediction_type="epsilon" if predict_epsilon else "sample")
+
         if trained_betas is not None:
-            self.betas = torch.from_numpy(trained_betas)
+            self.betas = torch.tensor(trained_betas, dtype=torch.float32)
         elif beta_schedule == "linear":
             self.betas = torch.linspace(beta_start, beta_end, num_train_timesteps, dtype=torch.float32)
         elif beta_schedule == "scaled_linear":
@@ -258,7 +273,19 @@ class DDIMScheduler(SchedulerMixin, ConfigMixin):
 
         # 3. compute predicted original sample from predicted noise also called
         # "predicted x_0" of formula (12) from https://arxiv.org/pdf/2010.02502.pdf
-        pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
+        if self.config.prediction_type == "epsilon":
+            pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
+        elif self.config.prediction_type == "sample":
+            pred_original_sample = model_output
+        elif self.config.prediction_type == "v_prediction":
+            pred_original_sample = (alpha_prod_t**0.5) * sample - (beta_prod_t**0.5) * model_output
+            # predict V
+            model_output = (alpha_prod_t**0.5) * model_output + (beta_prod_t**0.5) * sample
+        else:
+            raise ValueError(
+                f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample`, or"
+                " `v_prediction`"
+            )
 
         # 4. Clip "predicted x_0"
         if self.config.clip_sample:
@@ -329,5 +356,25 @@ class DDIMScheduler(SchedulerMixin, ConfigMixin):
         noisy_samples = sqrt_alpha_prod * original_samples + sqrt_one_minus_alpha_prod * noise
         return noisy_samples
 
+    def get_velocity(
+        self, sample: torch.FloatTensor, noise: torch.FloatTensor, timesteps: torch.IntTensor
+    ) -> torch.FloatTensor:
+        # Make sure alphas_cumprod and timestep have same device and dtype as sample
+        self.alphas_cumprod = self.alphas_cumprod.to(device=sample.device, dtype=sample.dtype)
+        timesteps = timesteps.to(sample.device)
+
+        sqrt_alpha_prod = self.alphas_cumprod[timesteps] ** 0.5
+        sqrt_alpha_prod = sqrt_alpha_prod.flatten()
+        while len(sqrt_alpha_prod.shape) < len(sample.shape):
+            sqrt_alpha_prod = sqrt_alpha_prod.unsqueeze(-1)
+
+        sqrt_one_minus_alpha_prod = (1 - self.alphas_cumprod[timesteps]) ** 0.5
+        sqrt_one_minus_alpha_prod = sqrt_one_minus_alpha_prod.flatten()
+        while len(sqrt_one_minus_alpha_prod.shape) < len(sample.shape):
+            sqrt_one_minus_alpha_prod = sqrt_one_minus_alpha_prod.unsqueeze(-1)
+
+        velocity = sqrt_alpha_prod * noise - sqrt_one_minus_alpha_prod * sample
+        return velocity
+
     def __len__(self):
         return self.config.num_train_timesteps

src/diffusers/schedulers/scheduling_ddim_flax.py

@@ -23,6 +23,7 @@ import flax
 import jax.numpy as jnp
 
 from ..configuration_utils import ConfigMixin, register_to_config
+from ..utils import deprecate
 from .scheduling_utils_flax import (
     _FLAX_COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS,
     FlaxSchedulerMixin,
@@ -108,9 +109,14 @@ class FlaxDDIMScheduler(FlaxSchedulerMixin, ConfigMixin):
             an offset added to the inference steps. You can use a combination of `offset=1` and
             `set_alpha_to_one=False`, to make the last step use step 0 for the previous alpha product, as done in
             stable diffusion.
+        prediction_type (`str`, default `epsilon`):
+            indicates whether the model predicts the noise (epsilon), or the samples. One of `epsilon`, `sample`.
+            `v-prediction` is not supported for this scheduler.
+
     """
 
     _compatibles = _FLAX_COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS.copy()
+    _deprecated_kwargs = ["predict_epsilon"]
 
     @property
     def has_state(self):
@@ -125,7 +131,17 @@ class FlaxDDIMScheduler(FlaxSchedulerMixin, ConfigMixin):
         beta_schedule: str = "linear",
         set_alpha_to_one: bool = True,
         steps_offset: int = 0,
+        prediction_type: str = "epsilon",
+        **kwargs,
     ):
+        message = (
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " FlaxDDIMScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
+        )
+        predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
+        if predict_epsilon is not None:
+            self.register_to_config(prediction_type="epsilon" if predict_epsilon else "sample")
+
         if beta_schedule == "linear":
             self.betas = jnp.linspace(beta_start, beta_end, num_train_timesteps, dtype=jnp.float32)
         elif beta_schedule == "scaled_linear":
@@ -259,7 +275,19 @@ class FlaxDDIMScheduler(FlaxSchedulerMixin, ConfigMixin):
 
         # 3. compute predicted original sample from predicted noise also called
         # "predicted x_0" of formula (12) from https://arxiv.org/pdf/2010.02502.pdf
-        pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
+        if self.config.prediction_type == "epsilon":
+            pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
+        elif self.config.prediction_type == "sample":
+            pred_original_sample = model_output
+        elif self.config.prediction_type == "v_prediction":
+            pred_original_sample = (alpha_prod_t**0.5) * sample - (beta_prod_t**0.5) * model_output
+            # predict V
+            model_output = (alpha_prod_t**0.5) * model_output + (beta_prod_t**0.5) * sample
+        else:
+            raise ValueError(
+                f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample`, or"
+                " `v_prediction`"
+            )
 
         # 4. compute variance: "sigma_t(η)" -> see formula (16)
         # σ_t = sqrt((1 − α_t−1)/(1 − α_t)) * sqrt(1 − α_t/α_t−1)

src/diffusers/schedulers/scheduling_ddpm.py

@@ -16,7 +16,7 @@
 
 import math
 from dataclasses import dataclass
-from typing import Optional, Tuple, Union
+from typing import List, Optional, Tuple, Union
 
 import numpy as np
 import torch
@@ -99,12 +99,14 @@ class DDPMScheduler(SchedulerMixin, ConfigMixin):
             `fixed_small_log`, `fixed_large`, `fixed_large_log`, `learned` or `learned_range`.
         clip_sample (`bool`, default `True`):
             option to clip predicted sample between -1 and 1 for numerical stability.
-        predict_epsilon (`bool`):
-            optional flag to use when the model predicts the noise (epsilon), or the samples instead of the noise.
-
+        prediction_type (`str`, default `epsilon`):
+            indicates whether the model predicts the noise (epsilon), or the samples. One of `epsilon`, `sample`.
+            `v-prediction` is not supported for this scheduler.
     """
 
     _compatibles = _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS.copy()
+    _deprecated_kwargs = ["predict_epsilon"]
+    order = 1
 
     @register_to_config
     def __init__(
@@ -113,13 +115,22 @@ class DDPMScheduler(SchedulerMixin, ConfigMixin):
         beta_start: float = 0.0001,
         beta_end: float = 0.02,
         beta_schedule: str = "linear",
-        trained_betas: Optional[np.ndarray] = None,
+        trained_betas: Optional[Union[np.ndarray, List[float]]] = None,
         variance_type: str = "fixed_small",
         clip_sample: bool = True,
-        predict_epsilon: bool = True,
+        prediction_type: str = "epsilon",
+        **kwargs,
     ):
+        message = (
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " DDPMScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
+        )
+        predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
+        if predict_epsilon is not None:
+            self.register_to_config(prediction_type="epsilon" if predict_epsilon else "sample")
+
         if trained_betas is not None:
-            self.betas = torch.from_numpy(trained_betas)
+            self.betas = torch.tensor(trained_betas, dtype=torch.float32)
         elif beta_schedule == "linear":
             self.betas = torch.linspace(beta_start, beta_end, num_train_timesteps, dtype=torch.float32)
         elif beta_schedule == "scaled_linear":
@@ -241,13 +252,13 @@ class DDPMScheduler(SchedulerMixin, ConfigMixin):
 
         """
         message = (
-            "Please make sure to instantiate your scheduler with `predict_epsilon` instead. E.g. `scheduler ="
-            " DDPMScheduler.from_pretrained(<model_id>, predict_epsilon=True)`."
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " DDPMScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
         )
         predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
-        if predict_epsilon is not None and predict_epsilon != self.config.predict_epsilon:
+        if predict_epsilon is not None:
             new_config = dict(self.config)
-            new_config["predict_epsilon"] = predict_epsilon
+            new_config["prediction_type"] = "epsilon" if predict_epsilon else "sample"
             self._internal_dict = FrozenDict(new_config)
 
         t = timestep
@@ -265,10 +276,15 @@ class DDPMScheduler(SchedulerMixin, ConfigMixin):
 
         # 2. compute predicted original sample from predicted noise also called
         # "predicted x_0" of formula (15) from https://arxiv.org/pdf/2006.11239.pdf
-        if self.config.predict_epsilon:
+        if self.config.prediction_type == "epsilon":
             pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
-        else:
+        elif self.config.prediction_type == "sample":
             pred_original_sample = model_output
+        else:
+            raise ValueError(
+                f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample` "
+                " for the DDPMScheduler."
+            )
 
         # 3. Clip "predicted x_0"
         if self.config.clip_sample:
@@ -330,5 +346,25 @@ class DDPMScheduler(SchedulerMixin, ConfigMixin):
         noisy_samples = sqrt_alpha_prod * original_samples + sqrt_one_minus_alpha_prod * noise
         return noisy_samples
 
+    def get_velocity(
+        self, sample: torch.FloatTensor, noise: torch.FloatTensor, timesteps: torch.IntTensor
+    ) -> torch.FloatTensor:
+        # Make sure alphas_cumprod and timestep have same device and dtype as sample
+        self.alphas_cumprod = self.alphas_cumprod.to(device=sample.device, dtype=sample.dtype)
+        timesteps = timesteps.to(sample.device)
+
+        sqrt_alpha_prod = self.alphas_cumprod[timesteps] ** 0.5
+        sqrt_alpha_prod = sqrt_alpha_prod.flatten()
+        while len(sqrt_alpha_prod.shape) < len(sample.shape):
+            sqrt_alpha_prod = sqrt_alpha_prod.unsqueeze(-1)
+
+        sqrt_one_minus_alpha_prod = (1 - self.alphas_cumprod[timesteps]) ** 0.5
+        sqrt_one_minus_alpha_prod = sqrt_one_minus_alpha_prod.flatten()
+        while len(sqrt_one_minus_alpha_prod.shape) < len(sample.shape):
+            sqrt_one_minus_alpha_prod = sqrt_one_minus_alpha_prod.unsqueeze(-1)
+
+        velocity = sqrt_alpha_prod * noise - sqrt_one_minus_alpha_prod * sample
+        return velocity
+
     def __len__(self):
         return self.config.num_train_timesteps

src/diffusers/schedulers/scheduling_ddpm_flax.py

@@ -103,12 +103,13 @@ class FlaxDDPMScheduler(FlaxSchedulerMixin, ConfigMixin):
             `fixed_small_log`, `fixed_large`, `fixed_large_log`, `learned` or `learned_range`.
         clip_sample (`bool`, default `True`):
             option to clip predicted sample between -1 and 1 for numerical stability.
-        predict_epsilon (`bool`):
-            optional flag to use when the model predicts the noise (epsilon), or the samples instead of the noise.
-
+        prediction_type (`str`, default `epsilon`):
+            indicates whether the model predicts the noise (epsilon), or the samples. One of `epsilon`, `sample`.
+            `v-prediction` is not supported for this scheduler.
     """
 
     _compatibles = _FLAX_COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS.copy()
+    _deprecated_kwargs = ["predict_epsilon"]
 
     @property
     def has_state(self):
@@ -124,8 +125,17 @@ class FlaxDDPMScheduler(FlaxSchedulerMixin, ConfigMixin):
         trained_betas: Optional[jnp.ndarray] = None,
         variance_type: str = "fixed_small",
         clip_sample: bool = True,
-        predict_epsilon: bool = True,
+        prediction_type: str = "epsilon",
+        **kwargs,
     ):
+        message = (
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " FlaxDDPMScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
+        )
+        predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
+        if predict_epsilon is not None:
+            self.register_to_config(prediction_type="epsilon" if predict_epsilon else "sample")
+
         if trained_betas is not None:
             self.betas = jnp.asarray(trained_betas)
         elif beta_schedule == "linear":
@@ -204,7 +214,6 @@ class FlaxDDPMScheduler(FlaxSchedulerMixin, ConfigMixin):
         timestep: int,
         sample: jnp.ndarray,
         key: random.KeyArray,
-        predict_epsilon: bool = True,
         return_dict: bool = True,
         **kwargs,
     ) -> Union[FlaxDDPMSchedulerOutput, Tuple]:
@@ -227,13 +236,13 @@ class FlaxDDPMScheduler(FlaxSchedulerMixin, ConfigMixin):
 
         """
         message = (
-            "Please make sure to instantiate your scheduler with `predict_epsilon` instead. E.g. `scheduler ="
-            " DDPMScheduler.from_pretrained(<model_id>, predict_epsilon=True)`."
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " FlaxDDPMScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
         )
         predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
-        if predict_epsilon is not None and predict_epsilon != self.config.predict_epsilon:
+        if predict_epsilon is not None:
             new_config = dict(self.config)
-            new_config["predict_epsilon"] = predict_epsilon
+            new_config["prediction_type"] = "epsilon" if predict_epsilon else "sample"
             self._internal_dict = FrozenDict(new_config)
 
         t = timestep
@@ -251,10 +260,15 @@ class FlaxDDPMScheduler(FlaxSchedulerMixin, ConfigMixin):
 
         # 2. compute predicted original sample from predicted noise also called
         # "predicted x_0" of formula (15) from https://arxiv.org/pdf/2006.11239.pdf
-        if self.config.predict_epsilon:
+        if self.config.prediction_type == "epsilon":
             pred_original_sample = (sample - beta_prod_t ** (0.5) * model_output) / alpha_prod_t ** (0.5)
-        else:
+        elif self.config.prediction_type == "sample":
             pred_original_sample = model_output
+        else:
+            raise ValueError(
+                f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample` "
+                " for the FlaxDDPMScheduler."
+            )
 
         # 3. Clip "predicted x_0"
         if self.config.clip_sample:

src/diffusers/schedulers/scheduling_dpmsolver_multistep.py

@@ -21,7 +21,7 @@ import numpy as np
 import torch
 
 from ..configuration_utils import ConfigMixin, register_to_config
-from ..utils import _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS
+from ..utils import _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS, deprecate
 from .scheduling_utils import SchedulerMixin, SchedulerOutput
 
 
@@ -87,10 +87,9 @@ class DPMSolverMultistepScheduler(SchedulerMixin, ConfigMixin):
         solver_order (`int`, default `2`):
             the order of DPM-Solver; can be `1` or `2` or `3`. We recommend to use `solver_order=2` for guided
             sampling, and `solver_order=3` for unconditional sampling.
-        predict_epsilon (`bool`, default `True`):
-            we currently support both the noise prediction model and the data prediction model. If the model predicts
-            the noise / epsilon, set `predict_epsilon` to `True`. If the model predicts the data / x0 directly, set
-            `predict_epsilon` to `False`.
+        prediction_type (`str`, default `epsilon`):
+            indicates whether the model predicts the noise (epsilon), or the data / `x0`. One of `epsilon`, `sample`,
+            or `v-prediction`.
         thresholding (`bool`, default `False`):
             whether to use the "dynamic thresholding" method (introduced by Imagen, https://arxiv.org/abs/2205.11487).
             For pixel-space diffusion models, you can set both `algorithm_type=dpmsolver++` and `thresholding=True` to
@@ -118,6 +117,8 @@ class DPMSolverMultistepScheduler(SchedulerMixin, ConfigMixin):
     """
 
     _compatibles = _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS.copy()
+    _deprecated_kwargs = ["predict_epsilon"]
+    order = 1
 
     @register_to_config
     def __init__(
@@ -126,18 +127,27 @@ class DPMSolverMultistepScheduler(SchedulerMixin, ConfigMixin):
         beta_start: float = 0.0001,
         beta_end: float = 0.02,
         beta_schedule: str = "linear",
-        trained_betas: Optional[np.ndarray] = None,
+        trained_betas: Optional[Union[np.ndarray, List[float]]] = None,
         solver_order: int = 2,
-        predict_epsilon: bool = True,
+        prediction_type: str = "epsilon",
         thresholding: bool = False,
         dynamic_thresholding_ratio: float = 0.995,
         sample_max_value: float = 1.0,
         algorithm_type: str = "dpmsolver++",
         solver_type: str = "midpoint",
         lower_order_final: bool = True,
+        **kwargs,
     ):
+        message = (
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " DPMSolverMultistepScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
+        )
+        predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
+        if predict_epsilon is not None:
+            self.register_to_config(prediction_type="epsilon" if predict_epsilon else "sample")
+
         if trained_betas is not None:
-            self.betas = torch.from_numpy(trained_betas)
+            self.betas = torch.tensor(trained_betas, dtype=torch.float32)
         elif beta_schedule == "linear":
             self.betas = torch.linspace(beta_start, beta_end, num_train_timesteps, dtype=torch.float32)
         elif beta_schedule == "scaled_linear":
@@ -203,7 +213,7 @@ class DPMSolverMultistepScheduler(SchedulerMixin, ConfigMixin):
         """
         Convert the model output to the corresponding type that the algorithm (DPM-Solver / DPM-Solver++) needs.
 
-        DPM-Solver is designed to discretize an integral of the noise prediciton model, and DPM-Solver++ is designed to
+        DPM-Solver is designed to discretize an integral of the noise prediction model, and DPM-Solver++ is designed to
         discretize an integral of the data prediction model. So we need to first convert the model output to the
         corresponding type to match the algorithm.
 
@@ -221,13 +231,25 @@ class DPMSolverMultistepScheduler(SchedulerMixin, ConfigMixin):
         """
         # DPM-Solver++ needs to solve an integral of the data prediction model.
         if self.config.algorithm_type == "dpmsolver++":
-            if self.config.predict_epsilon:
+            if self.config.prediction_type == "epsilon":
                 alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
                 x0_pred = (sample - sigma_t * model_output) / alpha_t
-            else:
+            elif self.config.prediction_type == "sample":
                 x0_pred = model_output
+            elif self.config.prediction_type == "v_prediction":
+                alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
+                x0_pred = alpha_t * sample - sigma_t * model_output
+            else:
+                raise ValueError(
+                    f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample`, or"
+                    " `v_prediction` for the DPMSolverMultistepScheduler."
+                )
+
             if self.config.thresholding:
                 # Dynamic thresholding in https://arxiv.org/abs/2205.11487
+                orig_dtype = x0_pred.dtype
+                if orig_dtype not in [torch.float, torch.double]:
+                    x0_pred = x0_pred.float()
                 dynamic_max_val = torch.quantile(
                     torch.abs(x0_pred).reshape((x0_pred.shape[0], -1)), self.config.dynamic_thresholding_ratio, dim=1
                 )
@@ -236,15 +258,25 @@ class DPMSolverMultistepScheduler(SchedulerMixin, ConfigMixin):
                     self.config.sample_max_value * torch.ones_like(dynamic_max_val).to(dynamic_max_val.device),
                 )[(...,) + (None,) * (x0_pred.ndim - 1)]
                 x0_pred = torch.clamp(x0_pred, -dynamic_max_val, dynamic_max_val) / dynamic_max_val
+                x0_pred = x0_pred.type(orig_dtype)
             return x0_pred
         # DPM-Solver needs to solve an integral of the noise prediction model.
         elif self.config.algorithm_type == "dpmsolver":
-            if self.config.predict_epsilon:
+            if self.config.prediction_type == "epsilon":
                 return model_output
-            else:
+            elif self.config.prediction_type == "sample":
                 alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
                 epsilon = (sample - alpha_t * model_output) / sigma_t
                 return epsilon
+            elif self.config.prediction_type == "v_prediction":
+                alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
+                epsilon = alpha_t * model_output + sigma_t * sample
+                return epsilon
+            else:
+                raise ValueError(
+                    f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample`, or"
+                    " `v_prediction` for the DPMSolverMultistepScheduler."
+                )
 
     def dpm_solver_first_order_update(
         self,

src/diffusers/schedulers/scheduling_dpmsolver_multistep_flax.py

@@ -23,6 +23,7 @@ import jax
 import jax.numpy as jnp
 
 from ..configuration_utils import ConfigMixin, register_to_config
+from ..utils import deprecate
 from .scheduling_utils_flax import (
     _FLAX_COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS,
     FlaxSchedulerMixin,
@@ -118,10 +119,9 @@ class FlaxDPMSolverMultistepScheduler(FlaxSchedulerMixin, ConfigMixin):
         solver_order (`int`, default `2`):
             the order of DPM-Solver; can be `1` or `2` or `3`. We recommend to use `solver_order=2` for guided
             sampling, and `solver_order=3` for unconditional sampling.
-        predict_epsilon (`bool`, default `True`):
-            we currently support both the noise prediction model and the data prediction model. If the model predicts
-            the noise / epsilon, set `predict_epsilon` to `True`. If the model predicts the data / x0 directly, set
-            `predict_epsilon` to `False`.
+        prediction_type (`str`, default `epsilon`):
+            indicates whether the model predicts the noise (epsilon), or the data / `x0`. One of `epsilon`, `sample`,
+            or `v-prediction`.
         thresholding (`bool`, default `False`):
             whether to use the "dynamic thresholding" method (introduced by Imagen, https://arxiv.org/abs/2205.11487).
             For pixel-space diffusion models, you can set both `algorithm_type=dpmsolver++` and `thresholding=True` to
@@ -149,6 +149,7 @@ class FlaxDPMSolverMultistepScheduler(FlaxSchedulerMixin, ConfigMixin):
     """
 
     _compatibles = _FLAX_COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS.copy()
+    _deprecated_kwargs = ["predict_epsilon"]
 
     @property
     def has_state(self):
@@ -163,14 +164,23 @@ class FlaxDPMSolverMultistepScheduler(FlaxSchedulerMixin, ConfigMixin):
         beta_schedule: str = "linear",
         trained_betas: Optional[jnp.ndarray] = None,
         solver_order: int = 2,
-        predict_epsilon: bool = True,
+        prediction_type: str = "epsilon",
         thresholding: bool = False,
         dynamic_thresholding_ratio: float = 0.995,
         sample_max_value: float = 1.0,
         algorithm_type: str = "dpmsolver++",
         solver_type: str = "midpoint",
         lower_order_final: bool = True,
+        **kwargs,
     ):
+        message = (
+            "Please make sure to instantiate your scheduler with `prediction_type` instead. E.g. `scheduler ="
+            " FlaxDPMSolverMultistepScheduler.from_pretrained(<model_id>, prediction_type='epsilon')`."
+        )
+        predict_epsilon = deprecate("predict_epsilon", "0.10.0", message, take_from=kwargs)
+        if predict_epsilon is not None:
+            self.register_to_config(prediction_type="epsilon" if predict_epsilon else "sample")
+
         if trained_betas is not None:
             self.betas = jnp.asarray(trained_betas)
         elif beta_schedule == "linear":
@@ -242,7 +252,7 @@ class FlaxDPMSolverMultistepScheduler(FlaxSchedulerMixin, ConfigMixin):
         """
         Convert the model output to the corresponding type that the algorithm (DPM-Solver / DPM-Solver++) needs.
 
-        DPM-Solver is designed to discretize an integral of the noise prediciton model, and DPM-Solver++ is designed to
+        DPM-Solver is designed to discretize an integral of the noise prediction model, and DPM-Solver++ is designed to
         discretize an integral of the data prediction model. So we need to first convert the model output to the
         corresponding type to match the algorithm.
 
@@ -260,11 +270,20 @@ class FlaxDPMSolverMultistepScheduler(FlaxSchedulerMixin, ConfigMixin):
         """
         # DPM-Solver++ needs to solve an integral of the data prediction model.
         if self.config.algorithm_type == "dpmsolver++":
-            if self.config.predict_epsilon:
+            if self.config.prediction_type == "epsilon":
                 alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
                 x0_pred = (sample - sigma_t * model_output) / alpha_t
-            else:
+            elif self.config.prediction_type == "sample":
                 x0_pred = model_output
+            elif self.config.prediction_type == "v_prediction":
+                alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
+                x0_pred = alpha_t * sample - sigma_t * model_output
+            else:
+                raise ValueError(
+                    f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample`, "
+                    " or `v_prediction` for the FlaxDPMSolverMultistepScheduler."
+                )
+
             if self.config.thresholding:
                 # Dynamic thresholding in https://arxiv.org/abs/2205.11487
                 dynamic_max_val = jnp.percentile(
@@ -277,12 +296,21 @@ class FlaxDPMSolverMultistepScheduler(FlaxSchedulerMixin, ConfigMixin):
             return x0_pred
         # DPM-Solver needs to solve an integral of the noise prediction model.
         elif self.config.algorithm_type == "dpmsolver":
-            if self.config.predict_epsilon:
+            if self.config.prediction_type == "epsilon":
                 return model_output
-            else:
+            elif self.config.prediction_type == "sample":
                 alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
                 epsilon = (sample - alpha_t * model_output) / sigma_t
                 return epsilon
+            elif self.config.prediction_type == "v_prediction":
+                alpha_t, sigma_t = self.alpha_t[timestep], self.sigma_t[timestep]
+                epsilon = alpha_t * model_output + sigma_t * sample
+                return epsilon
+            else:
+                raise ValueError(
+                    f"prediction_type given as {self.config.prediction_type} must be one of `epsilon`, `sample`, "
+                    " or `v_prediction` for the FlaxDPMSolverMultistepScheduler."
+                )
 
     def dpm_solver_first_order_update(
         self, model_output: jnp.ndarray, timestep: int, prev_timestep: int, sample: jnp.ndarray

src/diffusers/schedulers/scheduling_euler_ancestral_discrete.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 from dataclasses import dataclass
-from typing import Optional, Tuple, Union
+from typing import List, Optional, Tuple, Union
 
 import numpy as np
 import torch
@@ -68,6 +68,7 @@ class EulerAncestralDiscreteScheduler(SchedulerMixin, ConfigMixin):
     """
 
     _compatibles = _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS.copy()
+    order = 1
 
     @register_to_config
     def __init__(
@@ -76,10 +77,10 @@ class EulerAncestralDiscreteScheduler(SchedulerMixin, ConfigMixin):
         beta_start: float = 0.0001,
         beta_end: float = 0.02,
         beta_schedule: str = "linear",
-        trained_betas: Optional[np.ndarray] = None,
+        trained_betas: Optional[Union[np.ndarray, List[float]]] = None,
     ):
         if trained_betas is not None:
-            self.betas = torch.from_numpy(trained_betas)
+            self.betas = torch.tensor(trained_betas, dtype=torch.float32)
         elif beta_schedule == "linear":
             self.betas = torch.linspace(beta_start, beta_end, num_train_timesteps, dtype=torch.float32)
         elif beta_schedule == "scaled_linear":
@@ -189,7 +190,7 @@ class EulerAncestralDiscreteScheduler(SchedulerMixin, ConfigMixin):
             )
 
         if not self.is_scale_input_called:
-            logger.warn(
+            logger.warning(
                 "The `scale_model_input` function should be called before `step` to ensure correct denoising. "
                 "See `StableDiffusionPipeline` for a usage example."
             )