Update pytorch.md -- Add torch tsinghua source

src/ai/pytorch.md

@@ -1,4 +1,47 @@
 # PyTorch
+## Installation
+### 根据OS和cuda选择适配的torch版本
+https://pytorch.org/get-started/previous-versions/
+### pip 
+#### 安装最新版
+```shell
+pip install torch torchvision torchaudio -i https://pypi.tuna.tsinghua.edu.cn/simple
+```
+#### 指定版本(preffered)
+创建名为pytorch310的虚拟环境
+```shell
+conda create -n pytorch310 python==3.10
+```
+激活环境
+```shell
+conda activate pytorch310
+```
+设置清华源，加速安装
+```shell
+pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
+```
+指定版本安装
+```shell
+pip install torch==2.0.0+cu118 torchvision==0.15.1+cu118 torchaudio==2.0.1+cu118 -f https://download.pytorch.org/whl/torch_stable.html
+```
+### 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/
+```
+#### 安装最新版
+```shell
+conda install pytorch torchvision torchaudio cudatoolkit=10.2
+```
+#### 指定版本
+```shell
+conda install pytorch==2.4.0 torchvision==0.19.0 torchaudio==2.4 cudatoolkit=10.2
+```
+
+## Tutorial
 - [pytorch examples](https://github.com/pytorch/examples)
 - [pytorch tutorials](https://github.com/pytorch/tutorials)
 - pytorch模型性能分析和优化: [weixin](https://mp.weixin.qq.com/s/lxJthBk1L2nYOyQyLbqqEw)