📝 doc(pytorch.md): update mirror site configuration

Author: M0rtzz

src/ai/pytorch.md

@@ -27,10 +27,34 @@ pip install torch==2.0.0+cu118 torchvision==0.15.1+cu118 torchaudio==2.0.1+cu118
 ### conda
 添加清华镜像源
 ```shell
-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 config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/
+# 若不含有`~/.condarc`，生成它
+ls ~/.condarc || conda config --set show_channel_urls yes
+
+# 之后配置镜像源（南科大提供的额外软件包镜像可以加速安装CUDA版Pytorch）
+tee ~/.condarc > /dev/null << EOF
+channels:
+  - defaults
+show_channel_urls: true
+default_channels:
+  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/r
+  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/pro
+  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
+  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
+  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/msys2
+custom_channels:
+  msys2: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  menpo: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  pytorch: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  bioconda: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  simpleitk: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  pytorch-lts: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  conda-forge: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  deepmodeling: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
+  nvidia: https://mirrors.sustech.edu.cn/anaconda-extra/cloud
+  
+envs_dirs:
+  - your-path/anaconda3/envs # 替换为您的路径（另外，若安装的是miniconda3，请自行替换），不设置此项有可能安装在`~/.conda/envs`中
+EOF
 ```
 #### 安装最新版
 ```shell