code: def test_commutes(self):
      input_array = self._sample_batch()
      representation = self._serializer.serialize(input_array)
      output_array = self._serializer.deserialize(representation)
      np.testing.assert_array_almost_equal(input_array, output_array)
  
imports: import gin
  import gym
  import numpy
  from tensorflow import test
  from trax.rl import space_serializer
label_desc: Use image node_id 4 for calling the DiscreteSpaceSerializerTest obj's underlying member method code with example usage: obj.test_commutes() without return types