Fixing tensorflow path

run this command
set PYTHONPATH=C:\tensorflow1\models
set PYTHONPATH=C:\tensorflow1\models\research
set PYTHONPATH=C:\tensorflow1\models\research\slim

run the following commands from the C:\tensorflow1\models\research directory:

C:\tensorflow1\models\research> python setup.py build
C:\tensorflow1\models\research> python setup.py install

source: https://github.com/EdjeElectronics/TensorFlow-Object-Detection-API-Tutorial-Train-Multiple-Objects-Windows-10/issues/150