ncnn 小板子

small-board	image	spec	squeezenet	mobilenet	shufflenet
Radxa Rock3A		A55 2.0GHz x 4	29.52	34.47	23.62
NanoPi M4		A72 1.8GHz x 2 A53 1.5GHz x 4	43.73	64.28	27.43
Raspberry Pi 3B+		A53 1.4GHz x 4	93.48	111.72	63.71
Khadas VIM3		A73 2.2GHz x 4 A53 1.8GHz x 2	30.98	42.57	21.62
PICO-PI-IMX7		A7 1.0GHz x 2	220.10	366.92	137.02