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Fix flash_attn inferface when seq_q is not equal seq_k - #400

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Fix flash_attn inferface when seq_q is not equal seq_k#400
benkerd22 wants to merge 1 commit into
NVIDIA:mainfrom
benkerd22:main

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@benkerd22

@benkerd22benkerd22 commented Aug 24, 2023•
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Fix a bug in FlashAttention when seqlen_q is not equal to seqlen_k (seqlen_v). For example, when KV-cache is enabled during inference, each step other than the first will have a query layer of sequence length=1.

The code is adapted from FlashSelfAttention of megatron-lm https://github.com/NVIDIA/Megatron-LM/blob/main/megatron/model/transformer.py#L375.

@benkerd22
Fix flash_attn inferface when seq_q is not equal seq_k
7731fd8
Signed-off-by: benkerd22 <benkerd22@gmail.com>
@cyanguwa

cyanguwa commented Aug 24, 2023

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Thanks @benkerd22 for submitting this PR. I think we have something similar in flight, #302 . Thanks!

@ptrendx

ptrendx commented Oct 20, 2023

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The problem was covered in #302 and that one is already merged. Closing (please reopen if you believe that there is functionality here not included in the other PR).

@ptrendxptrendx closed this Oct 20, 2023
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@benkerd22@cyanguwa@ptrendx