add torch_npu swa#263
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This pull request introduces the TorchNpuSWAFunction to support sliding window attention on NPU backends using torch_npu.npu_fusion_attention. The review identifies several critical issues, including misspelled keyword arguments and a mismatch in the number of return values in the backward method, both of which would cause runtime errors. Additionally, the feedback suggests avoiding hardcoded mask dimensions to support longer sequences, eliminating performance bottlenecks caused by host-device synchronization, and reducing code duplication by importing utility functions from the core module.
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