笔记
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple torchvision
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pip -U # 升级
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple # 配置
pip install torchsummary -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
sudo ln -s /usr/bin/python3.5 /usr/bin/python