code: def testPreprocessFnParam(self):
      # Mock a regular network so we can inspect its constructor parameters.
      class MockNetwork(object):
          def __init__(self, num_actions=3, inputs_preprocessed=False):
              self.num_actions = num_actions
              self.inputs_preprocessed = inputs_preprocessed
  
      # We create a subclass of JaxDQNAgent so we can override
      # _build_networks_and_optimizer and avoid network creation.
      class MockDQNAgent(dqn_agent.JaxDQNAgent):
          def _build_networks_and_optimizer(self):
              pass
  
      # Test with the default setting for preprocess_fn (None).
      agent = MockDQNAgent(num_actions=4, network=MockNetwork)
      self.assertEqual(4, agent.network_def.num_actions)
      self.assertFalse(agent.network_def.inputs_preprocessed)
  
      # Test with a non-None preprocess_fn.
      def preprocess_fn(x):
          return x * 10.0
  
      agent = MockDQNAgent(
          num_actions=5,
          network=MockNetwork,
          preprocess_fn=preprocess_fn,
      )
      self.assertEqual(5, agent.network_def.num_actions)
      self.assertTrue(agent.network_def.inputs_preprocessed)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import shutil
  from absl import flags
  from absl.testing import absltest
  from dopamine.discrete_domains import atari_lib
  from dopamine.jax.agents.dqn import dqn_agent
  from dopamine.utils import test_utils
  from flax import linen
  import gin
  import jax.numpy
  import mock
  import numpy
label_desc: Use image node_id 4 for calling the DQNAgentTest obj's underlying member method code with example usage: obj.testPreprocessFnParam() and returns: unknown