Linux环境中，切换conda镜像源（嘎嘎好用，下载pytorch又快又稳定）

sudo vim ~/.condarc

report_errors: false
channels:
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
  - http://mirrors.ustc.edu.cn/anaconda/pkgs/free/
  - defaults
show_channel_urls: true

vim ~/.condarc

conda config --remove-key channels