Windows Build/Link Error

[PNeigel]

I'm on Windows and I'm getting the following error:

C:\Files\Repos\DCNv2_old>python setup.py build develop
running build
running build_ext
building '_ext' extension
creating C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old
creating C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src
creating C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cpu
creating C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cuda
Emitting ninja build file C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\build.ninja...
Compiling objects...
Allowing ninja to set a default number of workers... (overridable by setting the environment variable MAX_JOBS=N)
1.10.0
creating C:\Files\Repos\DCNv2_old\build\lib.win-amd64-3.7
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.16.27023\bin\HostX86\x86\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:C:\Anaconda3\envs\torch16\lib\site-packages\torch\lib "/LIBPATH:C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.2\lib/x64" /LIBPATH:C:\Anaconda3\envs\torch16\libs /LIBPATH:C:\Anaconda3\envs\torch16\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.16.27023\ATLMFC\lib\x86" "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.16.27023\lib\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.17763.0\ucrt\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.17763.0\um\x86" c10.lib torch.lib torch_cpu.lib torch_python.lib cudart.lib c10_cuda.lib torch_cuda.lib /EXPORT:PyInit__ext C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\vision.obj C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cpu\dcn_v2_cpu.obj C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cpu\dcn_v2_im2col_cpu.obj C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cpu\dcn_v2_psroi_pooling_cpu.obj C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cuda\dcn_v2_cuda.obj C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cuda\dcn_v2_im2col_cuda.obj C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\cuda\dcn_v2_psroi_pooling_cuda.obj /OUT:build\lib.win-amd64-3.7_ext.cp37-win_amd64.pyd /IMPLIB:C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src_ext.cp37-win_amd64.lib
LINK : fatal error LNK1181: cannot open input file 'C:\Files\Repos\DCNv2_old\build\temp.win-amd64-3.7\Release\Files\Repos\DCNv2_old\src\vision.obj'
error: command 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.16.27023\bin\HostX86\x86\link.exe' failed with exit status 1181

Interesting is the bold fatal error, it's trying to open a compiled .obj, but every directory in \build\temp.win-amd64-3.7\Release\Files\ is empty, so apparently it's trying to link before compiling anything.

I'm on pytorch 1.6, CUDA 10.2, cudatoolkit 10.2.89, torchvision 0.7 and Windows 10

[astonastonaston]

exactly the same issue on my Win10 computer, did you manage it QwQ?

Update 2021/2/16: Solved by changing torch version to 1.2.0

[Victoria-1]

Hi, I get the same issue with torch==1.7.1, cuda==11.0 on windows, have you managed it or any suggestions? Thanks!

[rathaROG]

For all latest pytorchs with cuda on Windows:
https://github.com/rathaROG/DCNv2_Windows