ONNX Export Support for NLLLoss (#33509)
Summary:
Adding ONNX export support for torch.nn.NLLLoss().
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33509
Reviewed By: hl475
Differential Revision: D20052212
Pulled By: houseroad
fbshipit-source-id: 62efcff4efa1e0e97c65ad1b670c2fc1da08d28f
