class_docstr: Index lookup layer serialization.
code: def python_properties(self):
      # TODO(kathywu): Add python property validator
      metadata = self._python_properties_internal()
      if metadata["config"].get("has_static_table", False):
          metadata["config"]["vocabulary"] = None
      return metadata
  
imports: from tensorflow.python.keras.mixed_precision import policy
  from tensorflow.python.keras.saving.saved_model import base_serialization
  from tensorflow.python.keras.saving.saved_model import constants
  from tensorflow.python.keras.saving.saved_model import save_impl
  from tensorflow.python.keras.saving.saved_model import serialized_attributes
  from tensorflow.python.keras.utils import generic_utils
  from tensorflow.python.trackable import data_structures
  from tensorflow.python.util import nest
label_desc: Use image node_id 1 for calling the IndexLookupLayerSavedModelSaver obj's underlying member method code with example usage: obj.python_properties() and returns: metadata