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feat(musa): add sparse attention settings - #1488

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Watebear wants to merge 5 commits into
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musa_sparse_sgl
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feat(musa): add sparse attention settings#1488
Watebear wants to merge 5 commits into
mainfrom
musa_sparse_sgl

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@Watebear

@Watebear Watebear commented Sep 5, 2026

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step latency 0.912378s -> 0.873070s, 1.045x speedup
Fuse Q/K RoPE, AdaLN modulation and gates, SwiGLU, and the legacy RMSNorm scaling path while preserving LightX2V numerical behavior. Handle the non-contiguous AdaLN chunk row stride explicitly.
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