yolov5训练时候遇到的问题

yolov5训练时候遇到报错AttributeError: 'Namespace' object has no attribute 'label_smoothing'的问题
Traceback (most recent call last):
  File "D:\pythonProject2\yolov5-5.0\train.py", line 543, in 
    train(hyp, opt, device, tb_writer)
  File "D:\pythonProject2\yolov5-5.0\train.py", line 229, in train
    hyp['label_smoothing'] = opt.label_smoothing
AttributeError: 'Namespace' object has no attribute 'label_smoothing'

opt 里面没有定义 'label_smoothing' 这个属性吧，可以顺着代码返回看看， opt.label_smoothing 是怎么定义和赋值的