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dennybritz avatar dennybritz commented on September 22, 2024

Looking at the documentation it seems like both work to calculate the cross-entropy: http://deeplearning.net/software/theano/library/tensor/nnet/nnet.html#tensor.nnet.categorical_crossentropy

Also, using np.eye is a very inefficient way to make a one-hot vector since it builds the full identity matrix first. Really shouldn't use that.

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arisliang avatar arisliang commented on September 22, 2024

Actually, I tried if without np.eye, the example won't run for GPU, but it runs for CPU.

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dennybritz avatar dennybritz commented on September 22, 2024

It could be that the operation is not implemented on the GPU in Theano (CPU and GPU have different implementations and not everything is supported) and that's why you need to use one-hot vectors. You'd be able to see that from the error message though. Sorry, it has been a while since I wrote this code and I don't remember why exactIy I changed it to one-hot vectors.

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