class_docstr: Saver defining the methods and properties used to serialize Keras objects.
    
docstr: String stored in metadata field in the SavedModel proto.
  
  Returns:
    A serialized JSON storing information necessary for recreating this layer.
code: def tracking_metadata(self):
      """String stored in metadata field in the SavedModel proto.
  
      Returns:
        A serialized JSON storing information necessary for recreating this layer.
      """
      # TODO(kathywu): check that serialized JSON can be loaded (e.g., if an
      # object is in the python property)
      return json_utils.Encoder().encode(self.python_properties)
  
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 3 for calling the SavedModelSaver obj's underlying member method code with example usage: obj.tracking_metadata() and returns: json_utils