【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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