code: def test_fixed_gdn_has_correct_output(self):
      x = tf.random.uniform((10, 3), -0.5, 0.5, dtype=tf.float32)
      y = gdn.GDN(
          inverse=False,
          rectify=False,
          beta_parameter=[0, 0, 0],
          gamma_parameter=tf.ones((3, 3)),
      )(x)
      self.assertEqual(x.shape, y.shape)
      expected_y = x / tf.reduce_sum(abs(x), axis=-1, keepdims=True)
      self.assertAllClose(y, expected_y, rtol=0, atol=1e-6)
  
imports: import os
  from absl.testing import parameterized
  import tensorflow
  from tensorflow_compression.python.layers import gdn
  from tensorflow_compression.python.layers import parameters
label_desc: Use image node_id 9 for calling the GDNTest obj's underlying member method code with example usage: obj.test_fixed_gdn_has_correct_output() without return types