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This function is more accurate than torch.log() for small values of input - https://pytorch.org/docs/stable/generated/torch.log1p.html

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for more information, see https://pre-commit.ci



* move function definitions to the front of the first call
Signed-off-by: Xiaowei Ren <xren@nvidia.com>

* fix tensor view comments
Signed-off-by: Xiaowei Ren <xren@nvidia.com>

* refine CP unit test
Signed-off-by: Xiaowei Ren <xren@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



* typo fix
Signed-off-by: Xiaowei Ren <xren@nvidia.com>

* typo fix
Signed-off-by: Xiaowei Ren <xren@nvidia.com>

* save cp_size_a2a and rank_a2a in fwd
Signed-off-by: Xiaowei Ren <xren@nvidia.com>

* add more explainations of cp_group in doc_string
Signed-off-by: Xiaowei Ren <xren@nvidia.com>

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Signed-off-by: Xiaowei Ren <xren@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

move block_table arg to varlen_func section
Signed-off-by: Charlene Yang <8636796+cyanguwa@users.noreply.github.com>

* Docs fixes
Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>

* docs fix
Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>

* docs fix
Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>

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Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>
Co-authored-by: Pawel Gadzinski <pgadzinski@nvidia.com>

* relax contiguous check for flash attention
Signed-off-by: Xin Yao <xiny@nvidia.com>

* force contiguous for cp
Signed-off-by: Xin Yao <xiny@nvidia.com>

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Signed-off-by: Xin Yao <xiny@nvidia.com>