安装 pytorch 出现cudatoolkit和pytorch 下载不了

问题：

使用conda install pytorch==1.2.0 torchvision==0.4.0 cudatoolkit=10.0 -c pytorch
安装 pytorch 出现cudatoolkit和pytorch 下载进度终止

出现报错：

CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://conda.anaconda.org/pytorch/linux-64/torchvision-0.4.0-py37_cu100.tar.bz2>
Elapsed: -

An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.

CondaError: Downloaded bytes did not match Content-Length
  url: https://repo.anaconda.com/pkgs/main/linux-64/cudatoolkit-10.0.130-0.conda
  target_path: /home/face/.conda/pkgs/cudatoolkit-10.0.130-0.conda
  Content-Length: 273930673
  downloaded bytes: 127105478

CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://conda.anaconda.org/pytorch/linux-64/pytorch-1.2.0-py3.7_cuda10.0.130_cudnn7.6.2_0.tar.bz2>
Elapsed: -

An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.

解决：

使用清华镜像源：

# 
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
conda config --set show_channel_urls yes

conda install pytorch torchvision cudatoolkit=10.0

试了几次结果还是失败，貌似，清华镜像的网站失效了！！

（此时发现系统中并没有安装Anaconda，不知道跟这个有没有关系)

更多尝试：使用清华、阿里等镜像源提高pytorch安装成功率

参考：

记录cuda pytorch环境安装