Revert "torch.set_num_threads sets MKL option too" #4967
Merged
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Reverts #4949
The recent addition of setting MKL num threads in torch.set_num_threads in multiprocessing on cuda CI machines causes segfaults. Our dataloader workers indeed do
torch.set_num_threads(1)before the loading loop. Let's revert this first to unblock the PRs.