99 lines
3.0 KiB
Python
99 lines
3.0 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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from abc import ABC, abstractmethod
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from dataclasses import dataclass
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from typing import List, Optional, Set, Union
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import torch
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from vllm.sequence import ExecuteModelRequest, PromptLogprobs
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from vllm.worker.worker_base import WorkerBase
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@dataclass
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class SpeculativeProposals:
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"""Datastructure used to represent proposal tokens from some proposer. It
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also tracks how many speculative tokens each sequence has.
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"""
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# Speculative proposal tokens.
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proposal_token_ids: torch.Tensor
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# Probabilities of the proposal tokens according to the proposer.
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proposal_probs: torch.Tensor
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# The valid length of each proposal; can be zero.
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proposal_lens: torch.Tensor
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# A flag to mark that there's no available proposals
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no_proposals: bool = False
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def __repr__(self):
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return (f"SpeculativeProposals("
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f"proposal_token_ids={self.proposal_token_ids}, "
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f"proposal_probs={self.proposal_probs.shape}, "
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f"proposal_lens={self.proposal_lens})")
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@dataclass
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class SpeculativeScores:
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"""Datastructure used to represent the scores of speculative tokens
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according to the scoring model.
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"""
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# Probabilities of the speculative tokens according to the scoring model.
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probs: torch.Tensor
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# Log-probabilities of the speculative tokens according to the scoring
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# model. These values can be used to generate Logprob objects that are
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# returned to the user.
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logprobs: torch.Tensor
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# Token ids sampled from the scoring model. Used for speculative bonus
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# tokens and also non-speculative normal decoding.
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token_ids: torch.Tensor
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# Optional last hidden states from the scoring model.
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hidden_states: Optional[torch.Tensor] = None
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# Scoring model may also return logprobs for prompt tokens
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# for each request, when chunked prefill is enabled.
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prompt_logprobs: Optional[List[PromptLogprobs]] = None
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def __repr__(self):
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return (f"SpeculativeScores("
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f"probs={self.probs.shape}, "
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f"token_ids={self.token_ids.shape})")
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class SpeculativeProposer(ABC):
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@abstractmethod
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def get_spec_proposals(
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self,
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execute_model_req: ExecuteModelRequest,
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# If set, this contains all sequence IDs that were assigned
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# bonus tokens in their last forward pass.
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seq_ids_with_bonus_token_in_last_step: Set[int],
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) -> SpeculativeProposals:
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raise NotImplementedError
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class SpeculativeScorer(ABC):
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def __init__(self, scorer_worker: WorkerBase,
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device: Union[torch.device, str], vocab_size: int):
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self._scorer_worker = scorer_worker
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if isinstance(device, torch.device):
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device = device.type
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self._device = device
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self._vocab_size = vocab_size
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@abstractmethod
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def score_proposals(
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self,
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execute_model_req: ExecuteModelRequest,
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proposals: SpeculativeProposals,
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) -> SpeculativeScores:
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raise NotImplementedError
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