pip install PyQt5 -i https://pypi.tuna.tsinghua.edu.cn/simple/
pip install pyqt5-tools -i https://pypi.tuna.tsinghua.edu.cn/simple/
pip install lxml -i https://pypi.tuna.tsinghua.edu.cn/simple/
pip install labelImg -i https://pypi.tuna.tsinghua.edu.cn/simple/