论文下载地址：https://arxiv.org/abs/1512.02325
论文代码：https://github.com/weiliu89/caffe/tree/ssd
The Single Shot Detector (SSD)
创新点：
在5个feature map 上同时预测。
SSD结构
损失函数
N is the number of matched default boxes.
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The confidence loss is the softmax loss over multiple classes confidences (c)
