Use torch distributed#123

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mucunwuxian wants to merge 2 commits intoHRNet:pytorch-v1.1from

mucunwuxian:use_torch_distributed

Commits on Apr 12, 2020

unify with policy using torch.distributed
mucunwuxian
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Commits on Apr 19, 2020

add specification of number of GPUs used
mucunwuxian
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