google object detection api error: ModuleNotFoundError: No module named 'pycocotools’

You might see this error : No module named 'pycocotools’, when you try to start train.
I refer to my solution.
Good luck!

Error:

ModuleNotFoundError: No module named 'pycocotools’

Solution :

git clone https://github.com/cocodataset/cocoapi.git

cd cocoapi/PythonAPI

make

cp -r pycocotools <path_to_object_detection_api>/models/research/