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I have installed theano on windows7,64bit on winpython using their guide http://deeplearning.net/software/theano/install_windows.html and I thought it worked since when I ran their first example I did have the expected results and no errors. I wanted to go ahead and install the part: Configure Theano for GPU use but when I runned again it I had this in the python console: 

runfile('C:/Users/PS/Desktop/prova theano.py', wdir='C:/Users/PS/Desktop')
ERROR (theano.sandbox.cuda): nvcc compiler not found on $PATH. Check your nvcc installation and try again.
ERROR:theano.sandbox.cuda:nvcc compiler not found on $PATH. Check your nvcc installation and try again.
NP time: 0.156000[s], theano time: 0.181000[s] (times should be close when run on CPU!)
Result difference: 0.000000

the .theanorc file I am using is:

[global]
device = gpu
floatX = float32

[cuda]
root = C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5

[nvcc]
flags=-LC:\SciSoft\WinPython-64bit-2.7.9.4\python-2.7.9.amd64\libs
compiler_bindir=C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin

and I added it in C:\SciSoft\WinPython-64bit-2.7.9.4\settings as I understood from the guide.

By the way, I checked the C:\SciSoft\env.bat and when I write where nvcc it says not file found instead I have no problems with the other checkings. Is that because I haven't an NVIDIA card? I am totaly lost.Any help? Thank you

PSan
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  • `Is that because I haven't an NVIDIA card?` CUDA is made by nvidia for nvidia cards. Only OpenCL is ought to work with "all" gpus. – aleju Jun 02 '15 at 11:36
  • Oh I understand! But if I don' t want to use the GPU is theano correctly installed or can I have some troubles after bacause the GPU feature is one of the most important? I had some problem using lasagne ( neural network) and for this reason I checked this thing. And in case I will download OpenCL is there a guide that I can follow? – PSan Jun 02 '15 at 11:40

2 Answers2

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Theano is designed to work (almost) identically on both CPU and GPU. You don't need a GPU to use Theano and if you don't have a Nvidia GPU then you shouldn't try installing any GPU-specific stuff at all.

Daniel Renshaw
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  • Ok thanks. I tried with the simple pipi install theano without the GPU stuff and it worked but I have the same problem as before in lasagne so maybe it wasn't the problem. I will open another issue and I will accept your reply. Thanks – PSan Jun 02 '15 at 13:13
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aleju, if you don't want (or can't) use theano with GPU, you just need to change .theanorc to use only cpu. This will not cause any problem, except for poor performance.

[global]
device = cpu
...
Ygor de Mello Canalli
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