66 lines
2.1 KiB
Python
66 lines
2.1 KiB
Python
import torch
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from sglang.srt.sampling.penaltylib.orchestrator import (
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BatchedPenalizerOrchestrator,
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_BatchedPenalizer,
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)
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class BatchedPresencePenalizer(_BatchedPenalizer):
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"""
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Presence penalizer penalizes tokens based on their presence in the output.
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"""
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def __init__(self, orchestrator: BatchedPenalizerOrchestrator):
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self.orchestrator = orchestrator
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self._is_prepared = False
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def _is_required(self) -> bool:
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return any(
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req.sampling_params.presence_penalty != 0.0
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for req in self.orchestrator.reqs()
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)
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def _prepare(self):
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self.cumulated_presence_penalties = torch.zeros(
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(len(self.orchestrator.reqs()), self.orchestrator.vocab_size),
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dtype=torch.float32,
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device=self.orchestrator.device,
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)
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self.presence_penalties = (
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torch.tensor(
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data=[
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req.sampling_params.presence_penalty
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for req in self.orchestrator.reqs()
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],
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dtype=torch.float32,
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device=self.orchestrator.device,
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)
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).unsqueeze_(1)
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def _cumulate_output_tokens(self, output_ids: torch.Tensor):
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self.cumulated_presence_penalties.scatter_(
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dim=1,
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index=output_ids.unsqueeze(1),
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src=self.presence_penalties,
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)
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def _apply(self, logits: torch.Tensor) -> torch.Tensor:
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logits.sub_(self.cumulated_presence_penalties)
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def _filter(self, keep_indices: torch.Tensor):
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self.presence_penalties = self.presence_penalties[keep_indices]
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self.cumulated_presence_penalties = self.cumulated_presence_penalties[
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keep_indices
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]
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def _merge(self, their: "BatchedPresencePenalizer"):
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self.presence_penalties = torch.cat(
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[self.presence_penalties, their.presence_penalties], dim=0
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)
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self.cumulated_presence_penalties = torch.cat(
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[self.cumulated_presence_penalties, their.cumulated_presence_penalties],
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dim=0,
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)
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