Refactor attention functions and add autotuning support in Triton#288
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…nsors for backward saving
- Introduced `is_autotune` parameter across various functions in `flash_sparse_attn` to enable kernel autotuning. - Updated backward, forward, and decode functions to conditionally use autotuned kernels or default kernels based on the `is_autotune` flag. - Adjusted launch configuration parameters for autotuning, setting default tile sizes and warp configurations when autotuning is enabled. - Enhanced function signatures and documentation to reflect the new `is_autotune` and `skip_checks` parameters for improved performance tuning.
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