code: def object_identifier(self):
      return constants.SEQUENTIAL_IDENTIFIER
  
file_path: tensorflow-upstream/tensorflow/python/keras/saving/saved_model/model_serialization.py
imports: from tensorflow.python.keras.saving import saving_utils
  from tensorflow.python.keras.saving.saved_model import constants
  from tensorflow.python.keras.saving.saved_model import layer_serialization
  from tensorflow.python.keras.saving.saved_model import save_impl
label_desc: Use image node_id 1 for calling the SequentialSavedModelSaver obj's underlying member method code with example usage: obj.object_identifier() and returns: constants