错误信息：ImportError: No module named 'pycocotools'
或：error: command 'C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX86\x64\cl.exe' failed with exit status 2
或：error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools
或：ModuleNotFoundError: No module named 'Cython'
解决方法：
- pycocotools安装需要Visual C++ Build Tools，可以在https://visualstudio.microsoft.com/visual-cpp-build-tools/ 下载，原错误信息给出的链接已经失效了
- 除此之外，还需要安装Cython，直接pip即可
- 在Linux, 运行pip install git+https://github.com/waleedka/cocoapi.git#egg=pycocotools&subdirectory=PythonAPI
在Windows, 运行pip install git+https://github.com/philferriere/cocoapi.git#egg=pycocotools^&subdirectory=PythonAPI
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