pytorch

c3c0cf15 - Migrate binary_cross_entropy_backward from CUDA_tensor_apply4 to (#33995)

Migrate binary_cross_entropy_backward from CUDA_tensor_apply4 to (#33995) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/33995 TensorIterator Test Plan: Imported from OSS Differential Revision: D20196790 Pulled By: VitalyFedyunin fbshipit-source-id: c0c231a20e6e69fc3c68c3ac5082b20f2feb6158