ubuntu 18.04
pytorch1.40
cuda 10.1
cudnn
install gcc 5.5
https://blog.csdn.net/CAU_Ayao/article/details/83987120
remove old cuda and nvdia driver
https://askubuntu.com/questions/1170824/cuda-10-1-update-2-is-compatible-to-gcc-7-3-0-mine-is-7-4-0-is-this-the-cause