[optim] fused SGD supports ColoDDPV2 #1134
Merged
+31
−135
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Old fused SGD only supports (fp16 grad, fp16 param, fp16 momentum) and (fp32 grad, fp32 param, fp32 momentum), it also supports (fp16 grad, fp32 param, fp32 momentum) now, which is essential when using ColoDDPV2.