undefined symbol: nvrtcGetProgramLogSize

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莫名其妙 import torch,出现undefined symbol: nvrtcGetProgramLogSize错误
解决方法：

1. 卸载
   conda uninstall pytorch
conda uninstall libtorch
pip uninstall torch
pip uninstall torch # 两遍
2. 安装
   conda install pytorch cuda80 -c soumith
   (不要用conda install pytorch)