code: def test_merge(self):
      hps = hyperparameters.Hyperparameters()
      hps.Int("output_size", 50, 100)
      hps.Int("memory_size", 4, 32)
      hps_two = hyperparameters.Hyperparameters()
      hps_two.merge(hps, "TUNABLE1_")
      self.assertIn("TUNABLE1_output_size", hps_two)
      self.assertIn("TUNABLE1_memory_size", hps_two)
      self.assertNotIn("TUNABLE2_output_size", hps_two)
      self.assertNotIn("TUNABLE2_memory_size", hps_two)
      hps_three = hyperparameters.Hyperparameters()
      hps_three.Int("output_size", 50, 100)
      hps_three.Int("memory_size", 4, 32)
      hps_two.merge(hps_three, "TUNABLE2_")
      self.assertIn("TUNABLE1_output_size", hps_two)
      self.assertIn("TUNABLE1_memory_size", hps_two)
      self.assertIn("TUNABLE2_output_size", hps_two)
      self.assertIn("TUNABLE2_memory_size", hps_two)
  
imports: from absl.testing import absltest
  from model_search.hparams import hyperparameters
label_desc: Use image node_id 1 for calling the HyperparametersTest obj's underlying member method code with example usage: obj.test_merge() without return types