YOLO1-5的BackBone和Neck

YOLO1： Backbone: GoogLeNet with no inception modules Neck: None
 Head: YOLO [fc(1570)->7*7(5*2+20)] YOLO2： Backbone: darknet19 Neck: None
 Head: passthrough [conv->13*13*anchor*(5+20)]   7*7卷机使用3*3加1*

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