message: Make test suite backward compatible
diff: @@ -266,7 +266,9 @@ class Runner(object):
  model_pb_path = os.path.join(model_dir, 'model.onnx')
  model = onnx.load(model_pb_path)
  model_marker[0] = model
  - if not self.backend.is_compatible(model):
  + if hasattr(self.backend, 'is_compatible') \
  + and callable(self.backend.is_compatible) \
  + and not self.backend.is_compatible(model):
  raise unittest.SkipTest('Not compatible with backend')
  prepared_model = self.backend.prepare(model, device)
  assert prepared_model is not None
  