conda配置了镜像源还是从官网下载的原因（pytorch）

用conda安装软件的标准语法格式为&＃xff1a;

$ conda install -c

 而pytorch官网中conda给的命令行是这样的&＃xff0c;有-c选项&＃xff0c;就说明已经制定了下载地址&＃xff0c;所以自己配置的镜像源不管用。

 所以应该把-c pytorch去掉&＃xff0c;就可以从镜像源下载文件了。但是貌似有时候下载到的不是最新的&＃xff0c;但是可以正常用。

before

    package                    |            build
    ---------------------------|-----------------
    cudatoolkit-10.1.243       |       h6bb024c_0       347.4 MB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    pytorch-1.4.0              |py3.7_cuda10.1.243_cudnn7.6.3_0       432.9 MB  pytorch
    torchvision-0.5.0          |       py37_cu101         9.1 MB  pytorch
    ------------------------------------------------------------
                                           Total:       789.4 MB

after

The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    _pytorch_select-0.2        |            gpu_0           2 KB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    cudatoolkit-10.0.130       |                0       261.2 MB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    cudnn-7.6.5                |       cuda10.0_0       165.0 MB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    mkl-2019.4                 |              243       131.2 MB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    pytorch-1.3.1              |cuda100py37h53c1284_0       169.0 MB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    torchvision-0.4.2          |cuda100py37hecfc37a_0         6.4 MB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    ------------------------------------------------------------
                                           Total:       732.8 MB