By default, pytorch expects backward() to be called for the last output of the network - the loss function. The loss function always outputs ... ... <看更多>

OS: Ubuntu 17 PyTorch version:0.3.0.post4 How you installed PyTorch (conda, pip, source): pip Python version: 3.6.3 CUDA/cuDNN version: CUDA ... ... <看更多>

Variable also provides a backward method to perform backpropagation. For example, to backpropagate a loss function to train model parameter x, ... ... <看更多>

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So I went to the PyTorch GitHub and found the CrossEntropyLoss class, but without any backward function defined. Moving up, CrossEntropyLoss ... ... <看更多>