message: Test that axis argument accepts tuple.
  Test case to check bug fix for LayerNormalization
diff: @@ -539,6 +539,10 @@ class LayerNormalizationTest(keras_parameterized.TestCase):
  kwargs={'scale': False,
  'center': False},
  input_shape=(3, 3))
  + testing_utils.layer_test(
  + keras.layers.LayerNormalization,
  + kwargs={'axis': (-3, -2, -1)},
  + input_shape=(64, 64, 3))
  @tf_test_util.run_in_graph_and_eager_modes
  def test_layernorm_weights(self):
  