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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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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>

---------
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>

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

* make rotary_base arg
Signed-off-by: Sudhakar Singh <sudhakars@nvidia.com>

* rotary base can be a float
Co-authored-by: Tim Moon <4406448+timmoon10@users.noreply.github.com>
Signed-off-by: Sudhakar Singh <sudhakars@nvidia.com>

---------
Signed-off-by: Sudhakar Singh <sudhakars@nvidia.com>
Co-authored-by: Tim Moon <4406448+timmoon10@users.noreply.github.com>