GitLab

* 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

---------
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>

* Softcap v2 (fwd only).

* Some missing interface + remove overrides in tests.

When timeout connecting, you get URLError: <urlopen error timed out>, In that case, build it from source.

Set `packaging` and `ninja` as build time dependencies rather than runtime dependencies.

Optimize compile to 1: avoid oom 2: minimize swap usage 3: avoid threads starvation when letting ninja decide how many workers to spawn or manual MAX_JOBS "guesses". Logic is to take the min value of MAX_JOBS auto-calculated by two metrics: 1: cpu cores 2: free memory. This should allow flash-attn to compile close to the most efficient manner under any consumer/server env. (#832)

* Add nvcc note on bare_metal_version `RuntimeError`

* Run Black formatting