markdown 训练对象探测器与不平常的类。

Posted 2021-05-05

## References
1. [Using YOLO algorithms to conquer the global Data Science Challenge](https://medium.com/styria-data-science-tech-blog/using-yolo-algorithms-to-conquer-the-global-data-science-challenge-bee7793b0e54)
2. [yolov3-ultralytics-implemented-weighted-classes-sampling](https://github.com/ultralytics/yolov3/issues/249)
3.