Focal Loss for Dense Object Detection

参考：https://mp.weixin.qq.com/s?__biz=MzI0ODcxODk5OA==&mid=2247487991&idx=1&sn=7b6d2fb6fe8fc12c4fd5f2b8edd96f2a&chksm=e99d220edeeaab18ef37c6128269b5edb1564f6b240429c0c8a66ce594ffe6fd9b128f314092&scene=2

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