fix: example code

mindspore/dataset/engine/serializer_deserializer.py

@@ -46,8 +46,8 @@ def serialize(dataset, json_filepath=""):
         >>> dataset = dataset.map(operation=one_hot_encode, input_column_names="label")
         >>> dataset = dataset.batch(batch_size=10, drop_remainder=True)
         >>> # serialize it to JSON file
-        >>> ds.engine.serialize(dataset, json_filepath="/path/to/mnist_dataset_pipeline.json")
-        >>> serialized_data = ds.engine.serialize(dataset)  # serialize it to Python dict
+        >>> ds.serialize(dataset, json_filepath="/path/to/mnist_dataset_pipeline.json")
+        >>> serialized_data = ds.serialize(dataset)  # serialize it to Python dict
     """
     return dataset.to_json(json_filepath)
 
@@ -75,11 +75,11 @@ def deserialize(input_dict=None, json_filepath=None):
         >>> dataset = dataset.map(operation=one_hot_encode, input_column_names="label")
         >>> dataset = dataset.batch(batch_size=10, drop_remainder=True)
         >>> # Use case 1: to/from JSON file
-        >>> ds.engine.serialize(dataset, json_filepath="/path/to/mnist_dataset_pipeline.json")
-        >>> dataset = ds.engine.deserialize(json_filepath="/path/to/mnist_dataset_pipeline.json")
+        >>> ds.serialize(dataset, json_filepath="/path/to/mnist_dataset_pipeline.json")
+        >>> dataset = ds.deserialize(json_filepath="/path/to/mnist_dataset_pipeline.json")
         >>> # Use case 2: to/from Python dictionary
-        >>> serialized_data = ds.engine.serialize(dataset)
-        >>> dataset = ds.engine.deserialize(input_dict=serialized_data)
+        >>> serialized_data = ds.serialize(dataset)
+        >>> dataset = ds.deserialize(input_dict=serialized_data)
 
     """
     data = None