课程四(Convolutional Neural Networks)，第三 周（Object detection） —— 1.Practice questions：Detection algorithms
【解释】
tree的两个bounding boxes 都要保留，因为交并比小于0.5；car 0.73保留；pedestrain 0.98保留；motorcycle 0.58保留。一共5个。
【解释】
5个anchor box, 一个anchor box 对应（1+4+20）个标签，所以output volume 是 19*19*5*25
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