fix bugs in bert example script

example/Bert_NEZHA_cnwiki/train.py

@@ -39,6 +39,7 @@ import mindspore.dataset.engine.datasets as de
 import mindspore.dataset.transforms.c_transforms as C
 from mindspore import context
 from mindspore.common.tensor import Tensor
+import mindspore.common.dtype as mstype
 from mindspore.train.model import Model
 from mindspore.train.callback import ModelCheckpoint, CheckpointConfig, LossMonitor
 from mindspore.model_zoo.Bert_NEZHA import BertNetworkWithLoss, BertTrainOneStepCell
@@ -49,9 +50,9 @@ def create_train_dataset(batch_size):
     """create train dataset"""
     # apply repeat operations
     repeat_count = bert_train_cfg.epoch_size
-    ds = de.StorageDataset([bert_train_cfg.DATA_DIR], bert_train_cfg.SCHEMA_DIR,
-                           columns_list=["input_ids", "input_mask", "segment_ids", "next_sentence_labels",
-                                         "masked_lm_positions", "masked_lm_ids", "masked_lm_weights"])
+    ds = de.TFRecordDataset([bert_train_cfg.DATA_DIR], bert_train_cfg.SCHEMA_DIR,
+                            columns_list=["input_ids", "input_mask", "segment_ids", "next_sentence_labels",
+                                          "masked_lm_positions", "masked_lm_ids", "masked_lm_weights"])
     type_cast_op = C.TypeCast(mstype.int32)
     ds = ds.map(input_columns="masked_lm_ids", operations=type_cast_op)
     ds = ds.map(input_columns="masked_lm_positions", operations=type_cast_op)