Error while trying to run "webcam.py file of demo"

[Fariha1123]

❓ Questions and Help

I followed the install.md provided in git source and #1042, and everything works fine until the build. The build of maskrcnn-benchmark is successful as well.

Now I am trying to run "python webcam.py --help" in demo folder but fall into the following error:

`(maskrcnn-benchmark) D:\work\maskrcnn-benchmark\demo>python webcam.py --help
Traceback (most recent call last):
File "C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\site-packages\torch\utils\cpp_extension.py", line 949, in _build_extension_module
check=True)
File "C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\subprocess.py", line 418, in run
output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['ninja', '-v']' returned non-zero exit status 1.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "webcam.py", line 6, in
from predictor import COCODemo
File "D:\work\maskrcnn-benchmark\demo\predictor.py", line 6, in
from maskrcnn_benchmark.modeling.detector import build_detection_model
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\modeling\detector_init_.py", line 2, in
from .detectors import build_detection_model
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\modeling\detector\detectors.py", line 2, in
from .generalized_rcnn import GeneralizedRCNN
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\modeling\detector\generalized_rcnn.py", line 11, in
from ..backbone import build_backbone
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\modeling\backbone_init_.py", line 2, in
from .backbone import build_backbone
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\modeling\backbone\backbone.py", line 7, in
from maskrcnn_benchmark.modeling.make_layers import conv_with_kaiming_uniform
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\modeling\make_layers.py", line 10, in
from maskrcnn_benchmark.layers import Conv2d
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\layers_init_.py", line 10, in
from .nms import nms
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\layers\nms.py", line 2, in
from ._utils import _C
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\layers_utils.py", line 39, in
_C = _load_C_extensions()
File "d:\work\maskrcnn-benchmark\maskrcnn_benchmark\layers_utils.py", line 35, in _load_C_extensions
extra_include_paths=extra_include_paths,
File "C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\site-packages\torch\utils\cpp_extension.py", line 644, in load
is_python_module)
File "C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\site-packages\torch\utils\cpp_extension.py", line 813, in _jit_compile
with_cuda=with_cuda)
File "C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\site-packages\torch\utils\cpp_extension.py", line 866, in _write_ninja_file_and_build
_build_extension_module(name, build_directory, verbose)
File "C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\site-packages\torch\utils\cpp_extension.py", line 962, in _build_extension_module
raise RuntimeError(message)
RuntimeError: Error building extension 'torchvision': b'[1/1] "c:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.11.25503\bin\HostX64\x64/link.exe" vision.o nms_cpu.o ROIAlign_cpu.o deform_conv_cuda.cuda.o deform_conv_kernel_cuda.cuda.o deform_pool_cuda.cuda.o deform_pool_kernel_cuda.cuda.o nms.cuda.o ROIAlign_cuda.cuda.o ROIPool_cuda.cuda.o SigmoidFocalLoss_cuda.cuda.o /nologo /DLL c10.lib caffe2.lib torch.lib torch_python.lib caffe2_gpu.lib _C.lib /LIBPATH:C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\libs /LIBPATH:C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\site-packages\torch\lib "/LIBPATH:C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA\v10.0\lib/x64" cudart.lib /out:torchvision.pyd\r\nFAILED: torchvision.pyd \r\n"c:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.11.25503\bin\HostX64\x64/link.exe" vision.o nms_cpu.o ROIAlign_cpu.o deform_conv_cuda.cuda.o deform_conv_kernel_cuda.cuda.o deform_pool_cuda.cuda.o deform_pool_kernel_cuda.cuda.o nms.cuda.o ROIAlign_cuda.cuda.o ROIPool_cuda.cuda.o SigmoidFocalLoss_cuda.cuda.o /nologo /DLL c10.lib caffe2.lib torch.lib torch_python.lib caffe2_gpu.lib _C.lib /LIBPATH:C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\libs /LIBPATH:C:\Users\Fariha.Abbasi\AppData\Local\Continuum\anaconda3\envs\maskrcnn-benchmark\lib\site-packages\torch\lib "/LIBPATH:C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA\v10.0\lib/x64" cudart.lib /out:torchvision.pyd\r\n Creating library torchvision.lib and object torchvision.exp\r\nROIAlign_cuda.cuda.o : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __cdecl c10::cuda::CUDAStream::operator struct CUstream_st *(void)const " (_imp??BCUDAStream@cuda@c10@@QEBAPEAUCUstream_st@@xz) referenced in function "class at::Tensor __cdecl ROIAlign_forward_cuda(class at::Tensor const &,class at::Tensor const &,float,int,int,int)" (?ROIAlign_forward_cuda@@ya?AVTensor@at@@AEBV12@0MHHH@Z)\r\nROIPool_cuda.cuda.o : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __cdecl c10::cuda::CUDAStream::operator struct CUstream_st *(void)const " (_imp??BCUDAStream@cuda@c10@@QEBAPEAUCUstream_st@@xz)\r\nSigmoidFocalLoss_cuda.cuda.o : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __cdecl c10::cuda::CUDAStream::operator struct CUstream_st *(void)const " (_imp??BCUDAStream@cuda@c10@@QEBAPEAUCUstream_st@@xz)\r\nROIAlign_cuda.cuda.o : error LNK2019: unresolved external symbol "__declspec(dllimport) class c10::cuda::CUDAStream __cdecl c10::cuda::getCurrentCUDAStream(short)" (_imp?getCurrentCUDAStream@cuda@c10@@ya?AVCUDAStream@12@F@Z) referenced in function "class at::Tensor __cdecl ROIAlign_forward_cuda(class at::Tensor const &,class at::Tensor const &,float,int,int,int)" (?ROIAlign_forward_cuda@@ya?AVTensor@at@@AEBV12@0MHHH@Z)\r\nROIPool_cuda.cuda.o : error LNK2001: unresolved external symbol "__declspec(dllimport) class c10::cuda::CUDAStream __cdecl c10::cuda::getCurrentCUDAStream(short)" (_imp?getCurrentCUDAStream@cuda@c10@@ya?AVCUDAStream@12@F@Z)\r\nSigmoidFocalLoss_cuda.cuda.o : error LNK2001: unresolved external symbol "__declspec(dllimport) class c10::cuda::CUDAStream __cdecl c10::cuda::getCurrentCUDAStream(short)" (_imp?getCurrentCUDAStream@cuda@c10@@ya?AVCUDAStream@12@F@Z)\r\ntorchvision.pyd : fatal error LNK1120: 2 unresolved externals\r\nninja: build stopped: subcommand failed.\r\n'`

Please suggest what shall I do to fix it?

P.S: Cuda = 10.0
Python = 3.6.7
Pytorch = 1.1.0 stable

[laplaceson]

Same issue . Do you solve this?

[imzhangyd]

@Fariha1123 I had the same problem. Did you solve it？