pytorch >= 1.7.0    # export.py  need
opencv-python >= 4.5.5
depthai   2.13.3.0

1.首先转换模型到onnx，官方自带转换工具（opset 12 ）。
2.使用在线转换工具 http://blobconverter.luxonis.com/ 

https://docs.oakchina.cn/en/latest/
https://github.com/RangiLyu/nanodet
https://github.com/hpc203/nanodet-plus-opencv
https://github.com/Linzaer/Ultra-Light-Fast-Generic-Face-Detector-1MB
https://github.com/hpc203/yolo-fastestv2-opencv