'Field' object has no attribute 'vocab'

[SevenMpp]

Hello, excuse me, there was no problem during the training, but this error occurred during the prediction. I'm actually extracting predict as a function

PATH = './snapshot/best_steps_8600.pt'
args = confog_args()
text_field = data.Field(lower=True)
label_field = data.Field(sequential=False)
args.vocabulary_size = len(text_field.vocab)
args.cuda = args.device != -1 and torch.cuda.is_available()

In addition, the training data should also be loaded when predicting ？？？？？

Looking forward to your reply. Thank you