1. 卸载pytorch

conda uninstall pytorch
pip uninstall torch
pip uninstall torch

conda uninstall pytorch
pip uninstall torchvision
pip  uninstall torchvision

conda uninstall pytorch
pip uninstall torchaudio
pip uninstall torchaudio

2. uninstall cuda

sudo /usr/local/cuda-10.2/bin/cuda-uninstaller