Fix sync_batch_norm_op ncclallreduce error! #17918
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heavengate
approved these changes
Jun 8, 2019
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Fix sync_batch_norm_op ncclallreduce error
When nccl inits nccl comm using ncclCommInitAll, it meets error when allreduce ophandle and sync_batch_norm_op use ncclallreduce parallelly. So create a new nccl comm for sync_batch_norm_op. And these codes should be polished with a unified nccl management.
Fix PaddlePaddle/models#2338