IOU function in Object detection Notebook

[nishant-sethi]

Not correct for the cases where there is no intersection between two anchor boxes. Ideally, it should return 0

[pradumna-gautam]

The correct code:

START CODE HERE ### (≈ 7 lines)

yi1 = max(box1[1], box2[1])
xi1 = max(box1[0], box2[0])
yi1 = max(box1[1], box2[1])
xi2 = min(box1[2], box2[2])
yi2 = min(box1[3], box2[3])
inter_area = (xi2 - xi1)*(yi2 - yi1)
inter_area = max((xi2 - xi1), 0)*max((yi2 - yi1), 0)

END CODE HERE

It will give you following results :

iou for intersecting boxes = 0.14285714285714285
iou for non-intersecting boxes = 0.0
iou for boxes that only touch at vertices = 0.0
iou for boxes that only touch at edges = 0.0