GitLab

* base version

* restructure pipelines, add special fp8 epilogue

* add variants

* add fp8 causal and modify dynamic tile scheduler

* better causal schedule

* maintain two schedules for non causal and causal

* removing macros

* fix regression

* clean up unneeded methods and variants

* fix mistake with NumProducerThreads

* base version

* restructure pipelines, add special fp8 epilogue

* add variants

* add fp8 causal and modify dynamic tile scheduler

* better causal schedule

* maintain two schedules for non causal and causal

* removing macros

* fix regression

* clean up unneeded methods and variants

* fix mistake with NumProducerThreads

* use seqlen traits

* add fp8 .cu files and benchmark script

* fix merge issue

* fix merge issue

* fix merge issue

* remove duplicate code

* fix regression with varseqlen

* move varseqlen init in constexpr

* fix test script

* more constexpr on varseqlen and add max offset

* add back test cases

Co-authored-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>

This reverts commit 1899c970.

* adding files for fp8 changes.

* removed contiguous check.

* enable all tests except odd-seq-lengths, where it crashes now.

* undid clang formatting.

* change to correct tile size for headdim=128.

* fixed odd-seq-len-k.

* minor formatting.

* minor reformatting.

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Co-authored-by: Tri Dao <tridao@users.noreply.github.com>

Library name to import is `flash_attn_interface`, which matches the
test.

* Support ck in fmha

* Add ck submodule

* Do not return lse if return_softmax == false

* Use receipt to speed up ck compile time

* Integrate new version of ck_tile

* Support dropout for mha_fwd()

* Add dropout to mha_varlen_fwd()

* Update ck to develop

* Extract padding function for dropout randval

* Extract randval transformation function

* Sync the code structure and coding style with FA

* Remove this line, c++ api will handle this.
Sync with test_flash_attn.py

* fix compile error

* Add mha_bwd

* Generate dropout seed and offset from user generator

* update CK

* Add mha_varlen_bwd

* Use same python as build flash-attn to generate ck kernel

* Fix bug of group mode fwd about returning softmax lse

* larger the test tollerance

* Add test_flash_attn_output() and test_flash_attn_varlen_output()

* Always fill softmax_lse

* Remove duplicate benchmark script, since we already implement mha_bwd

* Refine get value from tuple

* Use default parameter for stream_config

* unblock all platform

* Add comment

* refine the test code

* Refine naming

* Add unpack to namespace

* Do not hardcode the warp size 64

* Add more targets

* Add README

* Optimize mha_fwd if seqlen_q == 1

* Support get_wheel_url for rocm

* Detect rocm environment by pytorch's IS_HIP_EXTENSION

* update to lastest ck

* Add necessary compile flag

* Sync the api with upstream FA

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Co-authored-by: carlushuang <carlus.huang@amd.com>
Co-authored-by: Yichen Yan <wenji.yyc@alibaba-inc.com>
Co-authored-by: Po Yen Chen <PoYen.Chen@amd.com>
Co-authored-by: Yichen Yan <oraluben@outlook.com>

* fwd var-seq-len

* fixes

* benchmark

* fixes

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Co-authored-by: Tri Dao <tridao@users.noreply.github.com>

* check in the two ways of approaching backwards for softcapping, both functional

* prepare the softcap switch for backwards

* temporary

* cleanup to the way Tri prefers

* calculate dtanh when copying from scores -> dtanh Tensor

* no ternary operators allowed for constexpr, so just use some hack found online

* fix maybe_dtanh, restore some files

* restore another file

* move calculate_dtanh to utils and colocate with apply_softcap

* cleanup

* maybe last cleanup

* save for another pr

* remove a stray line

* fix spacing

* fix an issue, and make test_flash_attn.py ready to test softcapping backwards

These tests are failing so I'm just disabling this case for now