message: Rename variable names from "graph" to "model"
  This is a follow up cleanup for
diff: @@ -39,7 +39,7 @@ node_tests = [
  # TODO: Add all the other operators
  ]
  -graph_tests = [
  +model_tests = [
  ('test_bvlc_alexnet', 'bvlc_alexnet'),
  ('test_densenet121', 'densenet121'),
  ('test_inception_v1', 'inception_v1'),
  @@ -63,8 +63,8 @@ class BackendTest(object):
  for nt in node_tests:
  self._add_node_test(*nt)
  - for gt in graph_tests:
  - self._add_graph_test(*gt)
  + for gt in model_tests:
  + self._add_model_test(*gt)
  def _prepare_model(self, model_name):
  onnx_home = os.path.expanduser(os.getenv('ONNX_HOME', '~/.onnx'))
  @@ -90,7 +90,7 @@ class BackendTest(object):
  raise ValueError('Duplicated test name: {}'.format(name))
  setattr(self.tests, name, test_func)
  - def _add_graph_test(self, test_name, model_name):
  + def _add_model_test(self, test_name, model_name):
  """
  Add A test for a single ONNX model against a reference implementation.
  test_name (string): Eventual name of the test. Must be prefixed
  @@ -101,14 +101,14 @@ class BackendTest(object):
  """
  def run(test_self):
  model_dir = self._prepare_model(model_name)
  - graph_pb_path = os.path.join(model_dir, 'graph.pb')
  - graph = onnx.load(graph_pb_path)
  - prepared_graph = self.backend.prepare(graph)
  + model_pb_path = os.path.join(model_dir, 'model.pb')
  + model = onnx.load(model_pb_path)
  + prepared_model = self.backend.prepare(model)
  for test_data_npz in glob.glob(os.path.join(model_dir, 'test_data_*.npz')):
  test_data = np.load(test_data_npz, encoding='bytes')
  inputs = list(test_data['inputs'])
  - outputs = list(prepared_graph.run(inputs))
  + outputs = list(prepared_model.run(inputs))
  ref_outputs = test_data['outputs']
  test_self.assertEqual(len(ref_outputs), len(outputs))
  for i in range(len(outputs)):
  