ImportError:undefined symbol: _ZN2at5sliceERKNS_6TensorElN3c108optionalIlEES5_l

报错

ImportError:undefined symbol: _ZN2at5sliceERKNS_6TensorElN3c108optionalIlEES5_l

解决方案

“undefined symbol” or “cannot open xxx.so”

If those symbols are CUDA/C++ symbols (e.g., libcudart.so or GLIBCXX), check whether the CUDA/GCC runtimes are the same as those used for compiling mmcv

If those symbols are Pytorch symbols (e.g., symbols containing caffe, aten, and TH), check whether the Pytorch version is the same as that used for compiling mmcv

Run
 python mmdet/utils/collect_env.py to check whether PyTorch, torchvision, and MMCV are built by and running on the same environment