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※important※ Mistake in iou() of util.py #21

@YsYusaito

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@YsYusaito
I added exception handling.
def iou(box1, box2):
    xi1 = max(box1[0][0], box2[0][0])
    yi1 = max(box1[0][1], box2[0][1])
    xi2 = min(box1[1][0], box2[1][0])
    yi2 = min(box1[1][1], box2[1][1])
    
    if(((xi2 - xi1) < 0) or ((yi2 - yi1) < 0)):
        IoU = 0
        return IoU
    else:
        inter_area = (xi2 - xi1)*(yi2 - yi1)
        
        # Formula: Union(A,B) = A + B - Inter(A,B)
        box1_area = (box1[1][1] - box1[0][1])*(box1[1][0]- box1[0][0])
        box2_area = (box2[1][1] - box2[0][1])*(box2[1][0]- box2[0][0])
        union_area = (box1_area + box2_area) - inter_area
        # compute the IoU
        IoU = inter_area / union_area
    
        return IoU

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