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* Create FlashAttentionUtils class in pytorch/d_p_a/utils/py for versioning info
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* Move AttentionParams and get_attention_backend from attention.py to d_p_a/utils.py
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* Move get_qkv_layout(), get_full_mask(), get_alibi(), get_attention_quantizers() to d_p_a/utils.py
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* Move tensor packing and unpacking helper functions from pyt/attention.py to d_p_a/utils.py
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* Move cumulative seqlens and indices methods from pyt/attention.py to d_p_a/utils.py
Rename cumulative functions from using _cu_ to using _cumul_ to differentiate from CUDA cu calls protocol
Rename tensor packaging methods with leading underscore to make them as internal to file
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* Remove unnecessary imports in pytorch/attention.py and d_p_a/utils.py
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* Create d_p_a/inference.py and move InferenceParams from pyt/attention.py to it
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Modify docs api for InferenceParams
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* Create d_p_a/rope.py and move RoPE methods from  pytorch/attention.py to it
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* Code cleanup
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* Fix qa testing induced bug
Code clean up
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* Fix incorrect pack_tensor arg type
Code clean up
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* nit: Resolve lint errors
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* Remove typedef FAUtils for FlashAttentionUtils
Use attn_log instead of att_log
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Fix lint error
Signed-off-by: Kshitij Janardan Lakhani <klakhani@nvidia.com>

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* nit: Fix the function name from get_cumul to the earlier get_cu
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* nit: Fix typos, explicit imports and remove extra comments
Signed-off-by: Kshitij Janardan Lakhani <klakhani@nvidia.com>

---------
Signed-off-by: Kshitij Janardan Lakhani <klakhani@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Charlene Yang <8636796+cyanguwa@users.noreply.github.com>