Sync 4 layer norms - bf16, fp32, optimizer states on restart #274
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stas00
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this PR uses microsoft/DeepSpeed#1801 @ d911e67 to sync layer norms:
all_reduce/OP.AVG is used in all 3 cases.
automatically works for all layers and all 4 types of layer norms - weights and biases.
this has been successfully applied to the live model and lead to layers getting in sync - but after some iterations some layers got out of sync again - some other bug to figure out.