Wenkai Du 5f96f13e75 Allow setup ring through NCCL_RINGS to facilitate testing ...

[ROCm/rccl commit: 5b03132ace]

2020-08-04 21:07:00 +00:00

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rccl

Allow setup ring through NCCL_RINGS to facilitate testing

2020-08-04 21:07:00 +00:00