code: def test_orthogonal_regularizer_input_rank_validation(self):
      with self.assertRaises(ValueError) as context:
          value = np.random.random((4, 4, 4))
          x = backend.Variable(value)
          regularizers.OrthogonalRegularizer(factor=0.1)(x)
  
      expected_message = (
          "Inputs to OrthogonalRegularizer must have rank 2. "
          f"Received: inputs.shape={(4, 4, 4)}"
      )
      self.assertEqual(str(context.exception), expected_message)
  
imports: import numpy
  from keras import backend
  from keras import regularizers
  from keras import testing
  from keras.regularizers.regularizers import validate_float_arg
label_desc: Use image node_id 9 for calling the RegularizersTest obj's underlying member method code with example usage: obj.test_orthogonal_regularizer_input_rank_validation() without return types