AgitatedDove14
Regarding Windows - pyqt5 is installed. That's the result of pip freeze :
PyQt5==5.15.2 pyqt5-plugins==5.15.2.2.1.0 PyQt5-sip==12.8.1 pyqt5-tools==5.15.2.3.0.2Following your link, I've used the last advise and installed pip install PySide2 - I have Python 3.7.7. That didn't help, the issue is the same.
Regarding Linux, I've tried to install object_detection==0.1 , but the requirement was already satisfied. Need to note, that the whole project is placed into "object_detection" folder of tensorflow models ( https://github.com/tensorflow/models/tree/master/research/object_detection ) - thus I expect that all necessary functions for training OD models will be accessible from the project's folder.