Evaluating Object Localization

Intersection Over Union

Non-max Suppression

One of the problems of Object Detection as you've learned about this so far, is that your algorithm may find multiple detections of the same objects. Rather than detecting an object just once, it might detect it multiple times. Non-max suppression is a way for you to make sure that your algorithm detects each object only once.
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Intersection Over Union
Non-max Suppression