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* Update native sparse attention example with scale parameter handling

- Add scale parameter processing in native_sparse_attention function
- Modify example script to include custom scale value
- Update function calls to pass scale parameter
- Enhance flexibility of sparse attention implementation

* Refactor Triton Native Sparse Attention Example

- Improve code formatting and readability in example_triton_nsa_bwd.py
- Standardize function and parameter alignment
- Remove unnecessary whitespaces and optimize imports
- Enhance code style consistency with previous commits