# InternLM2

This document shows how to build and run InternLM2 7B / 20B models in TensorRT-LLM on both single GPU, single node multi-GPU and multi-node multi-GPU.

## Overview

The TensorRT-LLM InternLM2 implementation is based on the LLaMA model. The implementation can
be found in [model.py](../../../../tensorrt_llm/models/llama/model.py).
The TensorRT-LLM InternLM2 example code lies in [`examples/models/core/internlm2`](./):

* [`convert_checkpoint.py`](./convert_checkpoint.py) converts the Huggingface Model of InternLM2 into TensorRT-LLM checkpoint.


In addition, there are two shared files in the parent folder [`examples`](../../../) for inference and evaluation:

* [`run.py`](../../../run.py) to run the inference on an input text;
* [`summarize.py`](../../../summarize.py) to summarize the articles in the [cnn_dailymail](https://huggingface.co/datasets/cnn_dailymail) dataset.

## Support Matrix
  * FP16 / BF16
  * INT8 & INT4 Weight-Only
  * Tensor Parallel

## Usage

The TensorRT-LLM InternLM2 example code locates at [examples/models/core/internlm2](./). It takes HF weights as input, and builds the corresponding TensorRT engines. The number of TensorRT engines depends on the number of GPUs used to run inference.

### Build TensorRT engine(s)

Please install required packages first to make sure the example uses matched `tensorrt_llm` version:

```bash
pip install -r requirements.txt
```

TensorRT-LLM InternLM2 builds TensorRT engine(s) from HF checkpoint. If no checkpoint directory is specified, TensorRT-LLM will build engine(s) with dummy weights.

InternLM2 has released several checkpoints of different size or capabilities under https://huggingface.co/internlm. Users can pick any one repository and follow instructions to prepare the checkpoint.

Below examples use [internlm2-chat-7b](https://huggingface.co/internlm/internlm2-chat-7b) and [internlm2-chat-20b](https://huggingface.co/internlm/internlm2-chat-20b) and assume these repositories are cloned or linked under this directory, for example `./internlm2-chat-7b`.

Normally `trtllm-build` only requires single GPU, but if you've already got all the GPUs needed for inference, you could enable parallel building to make the engine building process faster by adding `--workers` argument. Please note that currently `--workers` feature only supports single node.

Here're some examples:

```bash
# Build a single-GPU float16 engine from HF weights.
# gpt_attention_plugin is necessary in InternLM2.
# Try use_gemm_plugin to prevent accuracy issue.
cd examples/models/core/internlm2

# Convert the InternLM2 7B model using a single GPU and FP16.
python convert_checkpoint.py --model_dir ./internlm2-chat-7b/ \
                --dtype float16 \
                --output_dir ./internlm2-chat-7b/trt_engines/fp16/1-gpu/
# Note: setting `--dtype bfloat16` to use bfloat16 precision.

# BUild the InternLM2 7B model using a single GPU
trtllm-build --checkpoint_dir ./internlm2-chat-7b/trt_engines/fp16/1-gpu/ \
             --output_dir ./engine_outputs \
             --gemm_plugin float16

# Convert the InternLM2 7B model using a single GPU and apply INT8 weight-only quantization..
python convert_checkpoint.py --model_dir ./internlm2-chat-7b/ \
                --dtype float16 \
                --output_dir ./internlm2-chat-7b/trt_engines/int8/1-gpu/ \
                --use_weight_only \
                --weight_only_precision int8

trtllm-build --checkpoint_dir ./internlm2-chat-7b/trt_engines/int8/1-gpu/ \
             --output_dir ./engine_outputs \
             --gemm_plugin float16

# Note: setting `--weight_only_precision int4` to use INT4 weight-only quantization

# Build InternLM2 7B using 2-way tensor parallelism.
python convert_checkpoint.py --model_dir ./internlm2-chat-7b/ \
                --dtype float16 \
                --output_dir ./internlm2-chat-7b/trt_engines/fp16/2-gpu/ \
                --tp_size 2

trtllm-build --checkpoint_dir ./internlm2-chat-7b/trt_engines/fp16/2-gpu/ \
             --output_dir ./engine_outputs \
             --gemm_plugin float16

# Build InternLM2 20B using 2-way tensor parallelism.
python convert_checkpoint.py --model_dir ./internlm2-chat-20b/ \
                --dtype bfloat16 \
                --output_dir ./internlm2-chat-20b/trt_engines/bf16/2-gpu/ \
                --tp_size 2 --workers 2

trtllm-build --checkpoint_dir ./internlm2-chat-7b/trt_engines/bf16/2-gpu/ \
             --output_dir ./engine_outputs \
             --gpt_attention_plugin bfloat16  \
             --gemm_plugin bfloat16
```

#### INT8 weight only

Examples:

```bash
cd examples/models/core/internlm2

# For 7B models
python convert_checkpoint.py --model_dir ./internlm2-chat-7b  \
                             --output_dir ./internlm2-chat-7b/w8a16/ \
                             --dtype float16  \
                             --use_weight_only \
                             --weight_only_precision int8

# Build 7B model with both INT8 weight-only
trtllm-build --checkpoint_dir ./internlm2-chat-7b/w8a16 \
             --output_dir ./engine_outputs \
             --gemm_plugin float16
```


```bash
cd examples/models/core/internlm2

# For 20B models
python convert_checkpoint.py --model_dir ./internlm2-chat-20b  \
                            --output_dir ./internlm2-chat-20b/w8a16 \
                             --dtype float16  \
                             --use_weight_only \
                             --weight_only_precision int8

# Build 20B model with both INT8 weight-only
trtllm-build --checkpoint_dir ./internlm2-chat-20b/w8a16 \
              --output_dir ./engine_outputs \
              --gemm_plugin float16 \
```

### Run

To run a TensorRT-LLM InternLM2 model using the engines generated by `trtllm-build`

```bash
# InternLM2 7B with fp16
python ../../../run.py --max_output_len=120 \
                 --input_text 'Tell me about yourself.' \
                 --tokenizer_dir ./internlm2-chat-7b/ \
                 --engine_dir=./internlm2-chat-7b/trt_engines/fp16/1-gpu/

# InternLM2 7B with bf16
python ../../../run.py --max_output_len=120 \
                 --input_text 'Tell me about yourself.' \
                 --tokenizer_dir ./internlm2-chat-7b/ \
                 --engine_dir=./internlm2-chat-7b/trt_engines/bf16/1-gpu/

# InternLM2 7B with int8 weight only quantization
python ../../../run.py --max_output_len=120 \
                 --input_text 'Tell me about yourself.' \
                 --tokenizer_dir ./internlm2-chat-7b/ \
                 --engine_dir=./internlm2-chat-7b/trt_engines/weight_only/1-gpu/

# InternLM2 7B with fp16 and tensor parallelism
mpirun -n 2 --allow-run-as-root \
    python ../../../run.py --max_output_len=120 \
                     --input_text 'Tell me about yourself.' \
                     --tokenizer_dir ./internlm2-chat-7b/ \
                     --engine_dir=./internlm2-chat-7b/trt_engines/fp16/2-gpu/

# InternLM2 20B with fp16 and tensor parallelism and pipeline parallelism
mpirun -n 4 --allow-run-as-root \
    python ../../../run.py --max_output_len=120 \
                     --input_text 'Tell me about yourself.' \
                     --tokenizer_dir ./internlm2-chat-7b/ \
                     --engine_dir=./internlm2-chat-7b/trt_engines/bf16/4-gpu/
```

### Summarization using the InternLM2 model

```bash
# Run summarization using the InternLM2 7B model in FP16.
python ../../../summarize.py --test_trt_llm --test_hf \
                       --hf_model_dir ./internlm2-chat-7b/ \
                       --data_type fp16 \
                       --engine_dir ./engine_outputs

# Run summarization using the InternLM2 7B model quantized to w8a16.
python ../../../summarize.py --test_trt_llm --test_hf \
                       --hf_model_dir ./internlm2-chat-7b/ \
                       --data_type fp16 \
                       --engine_dir ./engine_outputs

# Run summarization using the InternLM2 7B model in FP16 using two GPUs.
mpirun -n 2 --allow-run-as-root \
    python ../../../summarize.py --test_trt_llm --test_hf \
                           --hf_model_dir ./internlm2-chat-7b/ \
                           --data_type fp16 \
                           --engine_dir ./internlm2-chat-7b/trt_engines/fp16/2-gpu/

# Run summarization using the InternLM2 20B model in BF16 using 4 GPUs.
mpirun -n 4 --allow-run-as-root \
    python ../../../summarize.py --test_trt_llm --test_hf \
                           --hf_model_dir ./internlm2-chat-20b/ \
                           --data_type bf16 \
                           --engine_dir ./internlm2-chat-20b/trt_engines/bf16/4-gpu/
```