Exception has occurred: TypeError object of type 'NoneType' has no len() in learner_cls.py when do Model inference

[ruianlc]

when load the local trained model, and do the model inference based on the given example, error occurs, below is the full information. anyone can helps, thanks.

Exception has occurred: TypeError
object of type 'NoneType' has no len()
File "E:\workspace\baseProject\code_repo\competitions\FastBERT-MutliLabel Text Classification\fast-bert\fast_bert\learner_cls.py", line 344, in init
t_total = len(train_dataloader) // self.grad_accumulation_steps * epochs
File "E:\workspace\baseProject\code_repo\competitions\FastBERT-MutliLabel Text Classification\fast-bert\fast_bert\learner_cls.py", line 245, in from_pretrained_model
return BertLearner(
File "E:\workspace\baseProject\code_repo\competitions\FastBERT-MutliLabel Text Classification\fast-bert\fast_bert\prediction.py", line 66, in get_learner
learner = BertLearner.from_pretrained_model(
File "E:\workspace\baseProject\code_repo\competitions\FastBERT-MutliLabel Text Classification\fast-bert\fast_bert\prediction.py", line 46, in init
self.learner = self.get_learner()
File "E:\workspace\baseProject\code_repo\competitions\FastBERT-MutliLabel Text Classification\fastbert-multilable.py", line 141, in predict
predictor = BertClassificationPredictor(
File "E:\workspace\baseProject\code_repo\competitions\FastBERT-MutliLabel Text Classification\fastbert-multilable.py", line 164, in
predict()
TypeError: object of type 'NoneType' has no len()

[XiaoxueWang1]

Hi @ruianlc I encountered the same problem after I upgraded the fast-bert package. It may be caused by upgrading this package, but I am not sure how I should change the code to aviod this issue.
After so long, have you solved it?