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[Core] simplify logits resort in _apply_top_k_top_p #8619

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Merged
merged 1 commit into from
Sep 19, 2024
+3 −6
Merged

[Core] simplify logits resort in _apply_top_k_top_p #8619

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9 changes: 3 additions & 6 deletions vllm/model_executor/layers/sampler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -433,12 +433,9 @@ def _apply_top_k_top_p(
logits_sort.masked_fill_(top_p_mask, -float("inf"))

# Re-sort the probabilities.
src = torch.arange(logits_idx.shape[-1],
device=logits_idx.device).expand_as(logits_idx)
logits_idx_inv = torch.empty_like(logits_idx).scatter_(dim=-1,
index=logits_idx,
src=src)
logits = torch.gather(logits_sort, dim=-1, index=logits_idx_inv)
logits = torch.empty_like(logits_sort).scatter_(dim=-1,
index=logits_idx,
src=logits_sort)
return logits


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