yolov5-6.1版本的早停机制不起作用，设置patience=5，并不会触发早停。

### Search before asking - [x] I have searched https://github.com/ultralytics/yolov5/issues and did not find a similar report. ### Project area _No response_ ### Bug yolov5-6.1版本的早停机制不起作用，设置patience=5，并不会触发早停。 ### Environment yolov5-6.1版本的早停机制不起作用，设置patience=5，并不会触发早停。 ### Minimal Reproducible Example _No response_ ### Additional _No response_ ### Are you willing to submit a PR? - [ ] Yes I'd like to help by submitting a PR!