code: def test_output_shape_is_correct(self):
      processor = effects.ModDelay()
  
      audio = tf.zeros((3, 16000))
      gain = tf.zeros((3, 16000, 1))
      phase = tf.zeros((3, 16000, 1))
      output = processor(audio, gain, phase)
  
      self.assertListEqual([3, 16000], output.shape.as_list())
  
imports: from absl.testing import parameterized
  from ddsp import effects
  import tensorflow.compat.v2
label_desc: Use image node_id 1 for calling the ModDelayTest obj's underlying member method code with example usage: obj.test_output_shape_is_correct() without return types