Don't patch tensor ops that aren't present #899
Merged
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Gives pytorch the liberty to remove some Tensor methods if desired (e.g.
__div__
, pytorch/pytorch#39151)Necessary as a stopgap to support existing scripts that use apex amp with recent pytorch. Fix is not an endorsement of apex amp over
torch.cuda.amp
.torch.cuda.amp
is still 100% the best way forward.Fixes errors with pytorch/pytorch#39151 and Amp tests pass locally.