mirror of
https://github.com/NVIDIA/TensorRT-LLM.git
synced 2026-01-30 07:33:48 +08:00
135 lines
5.1 KiB
Python
135 lines
5.1 KiB
Python
from dataclasses import dataclass, field
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from itertools import chain
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from typing import Dict, List, Optional, Tuple
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import torch
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from ..pyexecutor.decoder import DecoderState, TorchDecoder
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from .interface import SpecConfig, SpecMetadata, SpeculativeDecodingMode
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@dataclass
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class Eagle3Config(SpecConfig):
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spec_dec_name: str = "EAGLE3"
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eagle_weights_path: Optional[str] = None
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num_layers: int = 0
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hidden_size: int = 0
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def __post_init__(self):
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if self.eagle_weights_path is None:
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raise ValueError("Path to EAGLE3 weights must be specified.")
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self.spec_dec_mode = SpeculativeDecodingMode.from_string(
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self.spec_dec_name)
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self.num_extra_kv_tokens = 0
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def update_from_model_config(self, model_config):
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self.num_layers = model_config.num_hidden_layers
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self.hidden_size = model_config.hidden_size
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def get_draft_model_prompt(self,
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input_tokens: torch.Tensor) -> torch.Tensor:
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"""
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Eagle3 always throws away the first token when processing draft inputs
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"""
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return input_tokens[1:]
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@dataclass
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class Eagle3SpecMetadata(SpecMetadata):
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hidden_states: List[torch.Tensor] = field(default_factory=list)
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num_layers: int = 0
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layers_to_capture: Tuple[int, ...] = field(init=False)
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target_model_embed_tokens: Optional[torch.nn.Module] = None
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hidden_size: int = 0
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def __post_init__(self):
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if self.num_layers == 1:
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self.layers_to_capture = (1, )
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else:
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if self.num_layers <= 5:
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raise ValueError("Not enough hidden layers for EAGLE")
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self.layers_to_capture = (1, self.num_layers // 2 - 1,
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self.num_layers - 4)
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self.hidden_states = []
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if self.is_cuda_graph:
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# CUDA graphs need to use the same buffers between runs.
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max_seqlen = self.max_num_requests * (self.max_draft_tokens + 1)
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hidden_state_shape = (max_seqlen, self.hidden_size)
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for layer in self.layers_to_capture:
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self.hidden_states.append(
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torch.empty(hidden_state_shape, device='cuda'))
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def prepare(self):
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if not self.is_cuda_graph:
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self.hidden_states = []
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def maybe_capture_hidden_states(
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self,
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layer_id: int,
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hidden_states: torch.Tensor,
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residual: Optional[torch.Tensor] = None) -> None:
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if not self.is_cuda_graph:
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if layer_id in self.layers_to_capture:
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to_save = hidden_states + residual if residual is not None else hidden_states
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self.hidden_states.append(to_save)
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else:
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assert len(self.hidden_states) == len(self.layers_to_capture)
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for i, captured_layer_id in enumerate(self.layers_to_capture):
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if captured_layer_id == layer_id:
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to_save = hidden_states + residual if residual is not None else hidden_states
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self.hidden_states[i].copy_(to_save)
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break
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def get_hidden_states(
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self,
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scheduled_requests,
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num_rejected_tokens: Optional[Dict] = None) -> torch.Tensor:
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req_id_to_gather_ids = {}
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seq_start = 0
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for req_id, seqlen in zip(self.request_ids, self.seq_lens):
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if num_rejected_tokens is not None:
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if req_id in num_rejected_tokens:
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req_id_to_gather_ids[req_id] = list(
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range(seq_start,
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seq_start + seqlen - num_rejected_tokens[req_id]))
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else:
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req_id_to_gather_ids[req_id] = [seq_start + seqlen - 1]
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seq_start += seqlen
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hidden_states_gather_ids = []
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for req in chain(scheduled_requests.context_requests,
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scheduled_requests.generation_requests):
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hidden_states_gather_ids.extend(
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req_id_to_gather_ids[req.py_request_id])
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if len(self.hidden_states) == 1:
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return self.hidden_states[0][hidden_states_gather_ids]
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else:
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return torch.cat(
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[h[hidden_states_gather_ids] for h in self.hidden_states],
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dim=-1)
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class Eagle3Decoder(TorchDecoder):
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def _batch_decode(self, scheduled_requests, model_outputs):
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logits = model_outputs["logits"]
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new_tokens_device = torch.argmax(logits, dim=-1)
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if "d2t" in model_outputs:
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d2t = model_outputs["d2t"]
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new_tokens_device = d2t[new_tokens_device] + new_tokens_device
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new_tokens_host = new_tokens_device.to('cpu', non_blocking=True)
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new_tensors_device = {"new_tokens_device": new_tokens_device}
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new_tensors_host = {"new_tokens_host": new_tokens_host}
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decoder_event = torch.cuda.Event()
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decoder_event.record()
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return DecoderState(scheduled_requests=scheduled_requests,
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logits=logits,
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new_tensors_device=new_tensors_device,
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new_tensors_host=new_tensors_host,
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decoder_event=decoder_event)
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