Fix performance of WeightedRandomSampler #10636
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Summary: Since pytorch#8958 was merged, the BatchSampler samples 0d tensors from WeightedRandomSampler instead of integers. It significantly reduces performance. This PR fix it the same way as pytorch#10361 fix DistributedSampler. Pull Request resolved: pytorch#10636 Differential Revision: D9423869 Pulled By: zou3519 fbshipit-source-id: f94da2d4cccf70e63beea6cfc3d1230b5610ae44
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Since #8958 was merged, the BatchSampler samples 0d tensors from WeightedRandomSampler instead of integers. It significantly reduces performance. This PR fix it the same way as #10361 fix DistributedSampler.