text: Title: How can I test 'Mask_RCNN' without CUDA??
  Body: we have trained weight(.h5) file. training works well :)
  
  I checked that it works well in tf1.5 and cuda9.0. 
  But we want to test without cuda9.0. Is this possible?
  If possible, which part of the balloon.py file do I have to modify?