DCNv2 undefined symbol

[caleballen]

Hi there,
I can build the extension successfully but upon testing with either test file I get the following error. This would suggest the build was not successful.

python testcuda.py                                                                                                                                                                                                    
Traceback (most recent call last):
  File "testcuda.py", line 11, in <module>
    from dcn_v2 import dcn_v2_conv, DCNv2, DCN
  File "/home/david/CenterTrack/src/lib/model/networks/DCNv2/dcn_v2.py", line 13, in <module>
    import _ext as _backend
ImportError: /home/david/CenterTrack/src/lib/model/networks/DCNv2/_ext.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZNSt15__exception_ptr13exception_ptr10_M_releaseEv

I am running on Arch Linux x64 in a conda environment with pytorch==1.4.0 torchvision==0.5.0 and cudatoolkit=10.1.
Build logs

Any pointers on what could be causing this? I've tried many different version combinations from here.

[lwCVer]

Hi there, I can build the extension successfully but upon testing with either test file I get the following error. This would suggest the build was not successful.

python testcuda.py                                                                                                                                                                                                    
Traceback (most recent call last):
  File "testcuda.py", line 11, in <module>
    from dcn_v2 import dcn_v2_conv, DCNv2, DCN
  File "/home/david/CenterTrack/src/lib/model/networks/DCNv2/dcn_v2.py", line 13, in <module>
    import _ext as _backend
ImportError: /home/david/CenterTrack/src/lib/model/networks/DCNv2/_ext.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZNSt15__exception_ptr13exception_ptr10_M_releaseEv

I am running on Arch Linux x64 in a conda environment with pytorch==1.4.0 torchvision==0.5.0 and cudatoolkit=10.1. Build logs

Any pointers on what could be causing this? I've tried many different version combinations from here.

I also met the same problem. Have you solved this problem now

[caleballen]

I have solved the problem. As I was building DCN to run this, I reinstalled my system as per their environment using Ubuntu 18.04 LTS, Anaconda Python 3.6, CUDA 10.0, and PyTorch v1.0. In this environment DCN built correctly.

As for running it on Arch, I believe the undefined symbol could be due to Arch's modern GCC version, installing an older version may work but in my case it was faster to reload the system with Ubuntu.

[lwCVer]

I have solved the problem. As I was building DCN to run this, I reinstalled my system as per their environment using Ubuntu 18.04 LTS, Anaconda Python 3.6, CUDA 10.0, and PyTorch v1.0. In this environment DCN built correctly.

As for running it on Arch, I believe the undefined symbol could be due to Arch's modern GCC version, installing an older version may work but in my case it was faster to reload the system with Ubuntu.

thank you