class_docstr: Saver defining the methods and properties used to serialize Keras objects.
    
docstr: String stored in object identifier field in the SavedModel proto.
  
  Returns:
    A string with the object identifier, which is used at load time.
code: def object_identifier(self):
      """String stored in object identifier field in the SavedModel proto.
  
      Returns:
        A string with the object identifier, which is used at load time.
      """
      raise NotImplementedError
  
file_path: tensorflow-upstream/tensorflow/python/keras/saving/saved_model/base_serialization.py
imports: import abc
  from tensorflow.python.keras.saving.saved_model import json_utils
  from tensorflow.python.keras.saving.saved_model import utils
label_desc: Use image node_id 2 for calling the SavedModelSaver obj's underlying member method code with example usage: obj.object_identifier() without return types