code: def test_graph_reg_model_save_subclass(self):
      self._test_graph_reg_model_save(build_linear_subclass_model)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from absl.testing import parameterized
  from neural_structured_learning import configs
  from neural_structured_learning.keras import graph_regularization
  import numpy
  import tensorflow
  from google.protobuf import text_format
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 12 for calling the GraphRegularizationTest obj's underlying member method code with example usage: obj.test_graph_reg_model_save_subclass() without return types