在BERT模型中出现 IndexError: list index out of range 的错误

class data_generator:
    def __init__(self, data, batch_size=32, shuffle=True):
        self.data = data
        self.batch_size = batch_size
        self.shuffle = shuffle
        self.steps = len(self.data) // self.batch_size
        if len(self.data) % self.batch_size != 0:
            self.steps += 1

    def __len__(self):
        return self.steps

    def __iter__(self):
        while True:
            idxs = list(range(len(self.data)))

            if self.shuffle:
                np.random.shuffle(idxs)

            X1, X2, Y = [], [], []
            for i in idxs:
                d = self.data[i]
                text = d[0][:maxlen]
                x1, x2 = tokenizer.encode(first=text)
                y = d[1]
                X1.append(x1)
                X2.append(x2)
                Y.append([y])
                if len(X1) == self.batch_size or i == idxs[-1]:
                    X1 = seq_padding(X1)
                    X2 = seq_padding(X2)
                    Y = seq_padding(Y)
                    yield [X1, X2], Y
                    [X1, X2, Y] = [], [], []


# bert模型设置
# from tensorflow import ConfigProto
# from tensorflow import InteractiveSession
# config = ConfigProto()
# config.gpu_options.allow_growth = True
# session = InteractiveSession(config=config)
bert_model = load_trained_model_from_checkpoint(config_path, checkpoint_path, seq_len=None)  # 加载预训练模型**（错误显示出现在这一行）**
for l in bert_model.layers:
    l.trainable = True

运行结果

Traceback (most recent call last):
  File "F:/pycharm最新/3 第四次数据修改代码运行/bert/run_tnews_classifier.py", line 137, in <module>
    bert_model = load_trained_model_from_checkpoint(config_path, checkpoint_path, seq_len=None)  # 加载预训练模型
  File "D:\python3.7\lib\site-packages\keras_bert\loader.py", line 169, in load_trained_model_from_checkpoint
    **kwargs)
  File "D:\python3.7\lib\site-packages\keras_bert\loader.py", line 58, in build_model_from_config
    **kwargs)
  File "D:\python3.7\lib\site-packages\keras_bert\bert.py", line 84, in get_model
    dropout_rate=dropout_rate,
  File "D:\python3.7\lib\site-packages\keras_bert\layers\embedding.py", line 37, in get_embedding
    )(inputs[0]),
  File "D:\python3.7\lib\site-packages\keras\backend\tensorflow_backend.py", line 75, in symbolic_fn_wrapper
    return func(*args, **kwargs)
  File "D:\python3.7\lib\site-packages\keras\engine\base_layer.py", line 529, in __call__
    arguments=user_kwargs)
  File "D:\python3.7\lib\site-packages\keras\engine\base_layer.py", line 597, in _add_inbound_node
    output_tensors[i]._keras_shape = output_shapes[i]
IndexError: list index out of range

给位 挚友，能不能帮忙解决一下啊