If you enabled the GPU back-end, then shared variables will live on the GPU,
and the gradients will have the same type.
You have two options at this time:
- either call `.transfer('cpu')` on the symbolic gradients before using them as
outputs
- call numpy.asarray() on the GpuArrays returned by the Theano function
On Mon, Mar 27, 2017, duy kien nguyen wrote:
>
> Hi all,
>
> I tried to get the gradients from Theano in numpy type. But, when I defined
> the function, it returned pygpu.gpuarray.GpuArray. How can I solve this
> problem?
>
> Here is my function:
> ----------------------------------------------------------------------------------------------------------------------------
> cost = classifier.negative_log_likelihood(answer, answer_mask)
> grads = T.grad(cost, list(classifier.tparams.values()))
>
> optim = optimizer()
> # updates = optim(itemlist(classifier.tparams), grads)
>
> train_model = theano.function(
> inputs=[],
> outputs=[cost] + grads,
> # updates=updates,
> givens={
> img: shared_img, ques: shared_ques_casted, ans: shared_ans_casted[:-1],
> m_ques: shared_m_ques, m_ans: shared_m_ans[:-1],
> answer: shared_ans_casted[1:], answer_mask: shared_m_ans[1:]
> }
> )
>
> test_model = theano.function(
> inputs=[],
> outputs=classifier.samples(length_answer-1),
> givens={
> img: shared_img, ques: shared_ques_casted,
> m_ques: shared_m_ques
> }
> )
> ------------------------------------------------------------------------------------------------------------------------------
>
> Here is the type of the returned gradients (the first one is in numpy type
> but the other are not):
>
> <type 'numpy.ndarray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
> <type 'pygpu.gpuarray.GpuArray'>
>
> Thank you in advance
>
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