PyTorch镜像

    1. conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
    2. conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
    3. conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/
    4. conda config --set show_channel_urls yes