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Implementation of context parallel fused attention using all-gather.
Signed-off-by: Michael Goldfarb <mgoldfarb@nvidia.com>

* Propagate sm_margin to the underly layernorm kernels

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* implemented custom call with ffi in csrc

* moved headers of misc to misc.h, add ffi.h

* ActLu and DActLu lowering with ffi_lowering

* CastTranspose with ffi_lowering

* enabled cudaGraph

* added 4d input test case to TestActivationLu

* added operand_output_aliases for CastTranspose

* added env var NVTE_JAX_WITH_FFI, default value = 1

* replace casting ActivationEnum by taking its value

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* Support non-deterministic algo
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* Refine the helper function name
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* Move fixture to conftest.py
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* Support actlen = 0 after cuDNN 9.3.0
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* Add runtime_segment < max_segment tests
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* add multi-latent attention for DPA
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* fix Jax/Paddle API
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* fix lint
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* fix typo in test script
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* fix too-many-boolean lint error
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* Revert "fix lint"

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* fix stride check in get_qkv_layout
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* WIP: fix layout_thd tests
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* WIP: debug info
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* fix merge conflict
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* fix thd pad_between_seqs=False/True tests
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* Specify python version
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* Add classifiers for python
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* Add utils to build wheels
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* make wheel scripts
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* Add aarch
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* Fixes
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* Fix paddle wheel
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* fixes
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* fix
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* Fixes
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* fix
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* dynamically load nvrtc
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* Lint
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* remove residual packages; exclude stub from nvrtc .so search
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* properly include files for sdist
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* paddle wheel tie to python version
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* Fix paddle build from src [wip]
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* Fix workflow paddle build
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* Fix paddle
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* Fix paddle
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* fix lint from pr986
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* fix
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* Add sanity wheel test
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* Add sanity import to wheel test
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* remove upper limit on paddlepaddle version
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* Remove unused imports
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* Remove pybind11 dependency
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* Fix cpp tests
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* Search .sos in cuda home
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* fixes
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* CLeanup, remove residual code
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* add cuDNN swa
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* fix SWA
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* add set_deterministic and minor fixes for swa
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* add AttentionParams
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* add window_size to get_backend; fix jax and paddle
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* minor fixes; add set_deter to bwd_impl
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* fix unit tests
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* minor fixes and lint
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* minor fixes
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* minor tweak on wording
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* Integrate experimental ragged offset
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* Use per sequence based offsets
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* Format
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* Remove v/o_seq_offsets
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* Add FP16 sanity tests and remove forward tests from the automatically run tests
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* Enhance input checks
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* Separate fused attn to 2 differnt APIs and add the docs
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* Add experimental to the docs
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* Fix lint
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* Add runtime segments check
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* Remove finished TODO
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* simplify offset tensors
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* minor fixes; tests pass
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* fix C lint
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* minor fixes after merge
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* minor fix for fused attn fwd/bwd calls
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* fix Jax
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* adjust spacing in docstring
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* fix lint
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replaced plain C asserts with NVTE_CHECK to avoid unused-variable warnings
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