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IOU的输入
1 ground-truth的bounding box
2 预测的bounding box
IOU的输出
输出为值在[0,1]之间的数字
IOU = 两个矩形交集的面积/两个矩形的并集面积
Reference:
https://www.pyimagesearch.com/2016/11/07/intersection-over-union-iou-for-object-detection/