What is the mAP metric and how is it calculated?

Question

In computer vision and object detection, the common evaluation method is mAP. What is it and how is it calculated?

Answer 1

Intersection Over Union (IOU) is measure based on Jaccard Index that evaluates the overlap between two bounding boxes. It requires a ground truth bounding box and a predicted bounding box By applying the IOU we can tell if a detection is valid (True Positive) or not (False Positive).IOU is given by the overlapping area between the predicted bounding box and the ground truth bounding box divided by the area of union between them.