wrong detection for more images

[ghost]

Hello Dear, before all thing, I want to say your codes are so usefull and many thanks. I implemented everthing as you said. However, when I implement last code (6-WindowsPolypsDetection.ipynb: ) for detection of images from cvc-clinicdb sometimes it gets fine, and sometimes box is in wrong place (not detect polips). I checked there was no overfitting in my network. What is wrong with this ? Many thanks.