CRF层出错

[liukeyang8888]

你好，这是什么原因造成的呢？
Traceback (most recent call last):
File "D:/研究生/NER_DEMO-master/NER_DEMO-master/train.py", line 108, in
info_list = train_sample(train_model='BERTBILSTMCRF', epochs=15, log=log)
File "D:/研究生/NER_DEMO-master/NER_DEMO-master/train.py", line 52, in train_sample
model = model_class.creat_model()
File "D:\研究生\NER_DEMO-master\NER_DEMO-master\Model\BERT_BILSTM_CRF.py", line 51, in creat_model
x = self.crf(x)
File "D:\Application\python3.6\lib\site-packages\keras\engine\base_layer.py", line 443, in call
previous_mask = _collect_previous_mask(inputs)
File "D:\Application\python3.6\lib\site-packages\keras\engine\base_layer.py", line 1311, in _collect_previous_mask
mask = node.output_masks[tensor_index]
AttributeError: 'Node' object has no attribute 'output_masks'