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Reject Muon optimizer with reduce_scatter in ZeRO-1/2#8090

Merged
delock merged 2 commits into
deepspeedai:masterfrom
whycoming:fix/muon-zero12-reduce-scatter-guard
Jun 27, 2026
Merged

Reject Muon optimizer with reduce_scatter in ZeRO-1/2#8090
delock merged 2 commits into
deepspeedai:masterfrom
whycoming:fix/muon-zero12-reduce-scatter-guard