在服务器上安装langchain+chatglm-6b的环境包requirements时遇到报错： 

git clone --quiet https://github.com/facebookresearch/detectron2.git /tmp/pip-install-wdn8vazx/detectron2_09a41306c6a04abaa4ec763689775b94
  fatal: unable to access 'https://github.com/facebookresearch/detectron2.git/': Failed to connect to github.com port 443: Connection timed out
  error: subprocess-exited-with-error
 

解决办法： 

看错误信息detectron2的安装报错，具体看其实是网络连接问题，”Failed to connect to github.com port 443: Connection timed out“ ，单独安装detectron2，为其替换一个镜像即可。 

启智社区提供了关于这个包的国内镜像。 Learning-Develop-Union/detectron2 - detectron2 - OpenI - 启智AI开源社区提供普惠算力！

具体： 

在requirements 里将这行先注释掉。

pip3 install -r requirements.txt -i https://pypi.mirrors.ustc.edu.cn/simple/ && rm -rf pip3 cache dir

然后：

​
git clone https://openi.pcl.ac.cn/Learning-Develop-Union/detectron2.gitpython -m pip install -e detectron2
​

如果有继续提示关于protoc的错误“If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.” ，指定版本升级下即可。

pip install --upgrade protobuf==3.20.1