Compilation error on Windows

[RaphaelRoyerRivard]

Hello, I'm trying to install this python library on Windows (I know, support is not guaranteed). I'm having a problem related to CUDA, here is the error message:

1 error detected in the compilation of "C:/Users/root/AppData/Local/Temp/tmpxft_0000a540_00000000-10_correlation_cuda_kernel.cpp1.ii".
correlation_cuda_kernel.cu
error: command 'C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v10.0\\bin\\nvcc.exe' failed with exit status 1

I don't understand why it keeps trying to use CUDA 10.0. In my path environment variable, the CUDA 9.2 is listed before CUDA 10.0 and my pytorch has been installed with CUDA 9.0 (because it won't install for CUDA 9.2, I don't know if this may cause a problem). I've read in other discussions that the CUDA version must be compatible with the gcc version, but I don't know mine and I don't know how to find it.

What should I do?

[ClementPinard]

Well i don't have a clue on how to set environment variable on windows, but you probably have to specify the nvcc version to call.

You can e.g. see here to figure out how pytorch finds the cuda environment and how you can fix it for your problem. https://github.com/pytorch/pytorch/blob/master/torch/utils/cpp_extension.py#L25

Also some comments can help you here https://github.com/pytorch/pytorch/blob/master/torch/utils/cpp_extension.py#L599

[RaphaelRoyerRivard]

Oh, I forgot there was a CUDA_PATH environment variable. I am now able to force the use of CUDA 9.2 instead of 10.0, but it still fails with the same error.

1 error detected in the compilation of "C:/Users/root/AppData/Local/Temp/tmpxft_0000b8e4_00000000-10_correlation_cuda_kernel.cpp1.ii".
    correlation_cuda_kernel.cu
    error: command 'C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v9.2\\bin\\nvcc.exe' failed with exit status 1

In the thread of issue #1 , it is said that there seems to be incompatibilities with certain gcc and CUDA versions. Maybe I don't even have gcc on my computer. After a quick search on google, gcc doesn't seem to be easily usable on Windows...

[ClementPinard]

Have you tried to compile the official example ?
If the problem still occurs there, you might have more help from people experienced with windows on pytorch :)
https://github.com/pytorch/extension-cpp

[RaphaelRoyerRivard]

Oh, we need to install c++ Pytorch? I only have the python version of Pytorch currently installed.

I also installed gcc v8.2.0 through MinGW, but pip install spatial-correlation-sampler fails with the same error, not matter the version of CUDA it is using.

[RaphaelRoyerRivard]

Ok so I installed the c++ version of Pytorch from the repo you linked and then tried again the installation of your package in pip and it failed with the same error. Then I tried to install the cuda version of Pytorch from the same repo and it failed with the same error I was having. So I'll ask help on that repo and come back with the solution. Thanks for your help :)

[ClementPinard]

It's not c++ Pytorch, it's just an example on how to build cpp/cuda extensions like this one with pytorch.
The extension of this repo is based on the official example, that why I suggested you try the "basis" first.

[RaphaelRoyerRivard]

I seem to have the same error as this guy pytorch/extension-cpp#37 and the issue is a month old with no answer... This doesn't look good at all :S

[RaphaelRoyerRivard]

Someone answered with a working solution :D