yolov5 mobile 剪枝

有网络结构：

https://github.com/jylink/yolov5-mobilenetv3

Face detection(single class)

Network	Input size	Train data	Val data	FLOPS	Params	Weight size	[email protected]	Weight size	Easy	Medium	Hard
Retinaface-m0.25	320	WF	WF	-	-	1.68M	-	1.68M	74.5	55.3	23.2
YOLOv3-Ultra	320	WF	WF	110M	0.1M	515K	35.8	516K	75.507	71.034	43.083
MobileNetV2-YOLOv3-Nano-3yolo	320	WF	WF	0.69G	0.76M	3.2M	39.2	3.2M	83.464	79.303	47.205

Person detectio