do allgather only in shared optimizer states groups #4167
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@inkcherry, thanks for this PR. Note that this is a utility function is also used by zero stage 1 & 2, so this benefits more cases than bf16_optimizer. |
tjruwase
approved these changes
Aug 17, 2023
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notice their only one way (BF16_Optimizer) for bf16+pipeline train.
pipeline parallel with bf16(use zero1 optimizer) will default call this even if dp size = 1.
some time we may only try mp/pp>1 with dp=1 , this may cost some time.