Use a separate communicator for DP AMAX reduction #6022
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* use a separate communicator for amax reduction * use amax reduction group when training in fp8 --------- Co-authored-by: slym <[email protected]>
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* use a separate communicator for amax reduction * use amax reduction group when training in fp8 --------- Co-authored-by: slym <[email protected]> Signed-off-by: hsiehjackson <[email protected]>
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