YOLOv3

YOLOv1    https://blog.csdn.net/xue_csdn/article/details/105949984 YOLOv2    https://blog.csdn.net/xue_csdn/article/details/105950349 YOLOv3相对于v1和v2的改进之处： backbone变为darknet-53 output：多尺度预测 softmax变为lo

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