[Misc] Support attention logits soft-capping with flash-attn #7022
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This PR adds support for attention logits soft-capping in the FlashAttention backend.
This is done by
logits_soft_cap
fromAttentionMetadata
toAttentionImpl
.vllm-flash-attn == 2.6.1
which added support for soft-capping.Note that vllm-flash-attn v2.6.1 uses PyTorch 2.4.0, so the PR must be merged after #6951
This will hopefully resolve many of the issues in running Gemma2 models.