SyntaxError: Non-UTF-8 code starting with '\xef' in file train.py on line 450, but no encoding declared;

在训练YOLOv5源码报错：SyntaxError: Non-UTF-8 code starting with '\xef' in file train.py on line 450, but no encoding declared;

报错原因：编码问题

解决方法：在代码最上边添加一行 # coding=gbk