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fix: prefer inplace softmax to avoid copy (#2661) 

* fix: prefer inplace softmax to avoid copy

* Update server/text_generation_server/models/flash_causal_lm.py

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

---------

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>
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drbh 2024-10-17 08:49:02 -04:00 committed by GitHub
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commit 5f32dea1e2
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1 changed files with 3 additions and 2 deletions
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server/text_generation_server/models/flash_causal_lm.py
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@ -1922,8 +1922,9 @@ class FlashCausalLM(Model):
batch.adapter_meta.adapter_indices = next_adapter_indices
if prefill and prefill_logprobs:
# Get prefill logprobs
prefill_logprobs_tensor = torch.log_softmax(out, -1)
# Get prefill logprobs with inplace softmax (avoid copying the `out` tensor (max_batch_prefill_tokens * vocab_size))
torch.log_softmax(out, -1, out=out)
prefill_logprobs_tensor = out
prefill_logprobs = torch.gather(
prefill_logprobs_tensor, 1, prefill_tokens_indices.view(-1, 1)
)