当pip安装因为网络超时而无法安装的时候慢

2.4 尝试pip --default-timeout=1000 install  https://download.pytorch.org/whl/cu100/torch-1.1.0-cp36-cp36m-win_amd64.whl

python3 -m pip3 install torch===1.2.0 torchvision===0.4.0 -f https://download.pytorch.org/whl/torch_stable.html -i https://pypi.doubanio.com/simple