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Add custom mask-free fused backward & ring backward attention kernels (1.35x speedup on WAN 76k CP=4) - #485

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Add custom mask-free fused backward & ring backward attention kernels (1.35x speedup on WAN 76k CP=4)#485
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Add custom mask-free fused backward and ring backward attention kernels

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Google CLA / cla/google succeeded Sep 16, 2026 in 7s

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✅ a92f665 Author: @csgoogle <sag******ara​@google.com>

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