pytorch

5fa78303 - fix double backward for half softmax/logsoftmax (#17330)

fix double backward for half softmax/logsoftmax (#17330) Summary: Fix for #17261, SsnL do you have tests for it in your other PR? If not, I'll add to this. Example from #17261 now does not error out (and same for log_softmax). Pull Request resolved: https://github.com/pytorch/pytorch/pull/17330 Differential Revision: D14171529 Pulled By: soumith fbshipit-source-id: ee925233feb1b44ef9f1d757db59ca3601aadef2