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[Megatron-FSDP] Add conditional param.grad dereferencing logic to support full-iteration (FWD-BWD) CUDA graphability. #4663

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[Megatron-FSDP] Add conditional param.grad dereferencing logic to support full-iteration (FWD-BWD) CUDA graphability. #4663

Add cuda_graph_mode argument to explicitly control graph-unsafe opera…
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succeeded May 12, 2026 in 24s