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Take token count quantization of fused attention into consideration for CP results correction (#1396)

* fix second half lse shape
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* bug fixes
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* make pad_between_seqs check do not consider padding at the end
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* change CP THD test to make it consider 0-length sequence
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* minor change to flash func name
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* only use varlen func of flash attention while qkv_format is THD
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* try to converge code of flash and fused attentions
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* fix bwd compute with P2P
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* remove redundant out_per_step view
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* enable cudnn>9.6 and THD+GQA
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* enable CP with FusedAttn+SWA+All_Gather
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* enable CP with FusedAttn+SWA+All_Gather
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* code cleaning for cu_seqlens
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* fix some pylint error
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* minor import change for pylint
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* more fix for pylint
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* fix lse_seqlen in thd out correction
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Correct fused attention output after each step to reduce intermediate memory use.
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the current implementation would release the output of ln, leading to an error if setting `return_layernorm_output=True`.
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* Fix SWA mask for THD and forcing seqlen_kv >= seqlen_q for SWA
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* Generalize sliding window mask
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* Fix pylint
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Signed-off-by: Reese Wang <rewang@nvidia.com>

Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>

* add swa (left,0) + padding + brcm support
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* final fixes
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* upgrade to FE 1.9-rc
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* fix jax tests
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* skip thd + CP + fused attn tests for cuDNN 9.6+ due to different stats shapes
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