解决ValueError: loaded state dict contains a parameter group that doesn‘t match the size of optimizer‘

Run:

"""

python -c "from utils.general import *; strip_optimizer('path/to/best.pt')"

"""

And then retrain.

This is the case when you continue training with models that have not finished training first.

参考：https://github.com/ultralytics/yolov5/issues/7379