On Fri, Oct 21, 2016, Pascal Lamblin wrote:
> If you are calling dnn_conv directly, at least one of the inputs (say,
> either X or w1) should already be on a GPU, so cuDNN knows which GPU to
> use for the computation.
>
> What is the type of w1, w2, etc.?
> Are you running with device=cuda?
Also, please do not mix the old back-end (device=gpu,
theano.sandbox.cuda) with the new one (device=cuda, theano.gpuarray).
>
> On Thu, Oct 20, 2016, Xi wrote:
> > I am writing following code:
> >
> > ######################################################
> >
> > from theano.gpuarray.dnn import dnn_conv
> >
> >
> > lX = T.tensor4()
> >
> >
> > def convLayer(X, w1, w2, w3, w4):
> > h1 = dnn_conv(img=X, kerns=w1, subsample=(2, 2), border_mode=(1, 1))
> > h2 = dnn_conv(img=h1, kerns=w2, subsample=(2, 2), border_mode=(1, 1))
> > h3 = dnn_conv(img=h2, kerns=w3, subsample=(2, 2), border_mode=(1, 1))
> > h4 = dnn_conv(img=h3, kerns=w4, subsample=(2, 2), border_mode=(1, 1))
> > h4 = T.flatten(h4, 2)
> > return h4
> >
> >
> > lX_conv = convLayer(lX, w1, w2, w3, w4)
> >
> >
> > ######################################################
> >
> > I get an error like:
> >
> > Traceback (most recent call last):
> > File "<input>", line 1, in <module>
> > File "<input>", line 2, in convLayer
> > File
> > "/home/xi/Projects/Python/env/local/lib/python2.7/site-packages/theano/gpuarray/dnn.py",
> > line 970, in dnn_conv
> > ctx_name = infer_context_name(img, kerns)
> > File
> > "/home/xi/Projects/Python/env/local/lib/python2.7/site-packages/theano/gpuarray/basic_ops.py",
> > line 122, in infer_context_name
> > raise ValueError("Could not infer context from inputs")
> > ValueError: Could not infer context from inputs
> >
> >
> > I have tested this code on two configuration:
> > 1. theano 0.9.dev3 + cuda 8 + cudnn 5.1
> > 2. theano.9.0.dev1 + cuda 7.5 + cudnn 5.0
> >
> >
> > In the past I am import cudnn from *theano.sandbox**.cuda.dnn*, everything
> > runs good, however, not sure what wrong is when I try to import cudnn from
> > *theano.gpuarray.dnn*
> >
> > Can anyone helps or give some suggestion?
> >
> >
> >
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> >
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>
> --
> Pascal
>
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