code: def testInitializeAgent(self):
      q_net = critic_network.CriticNetwork(
          (self._observation_spec, self._action_spec)
      )
      agent = qtopt_agent.QtOptAgent(
          self._time_step_spec,
          self._action_spec,
          q_network=q_net,
          optimizer=None,
          init_mean_cem=self._mean,
          init_var_cem=self._var,
          num_samples_cem=self._num_samples,
          actions_sampler=self._sampler,
      )
      agent.initialize()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.agents.ddpg import critic_network
  from tf_agents.agents.qtopt import qtopt_agent
  from tf_agents.networks import network
  from tf_agents.policies.samplers import qtopt_cem_actions_sampler_continuous
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import policy_step
  from tf_agents.trajectories import test_utils
  from tf_agents.trajectories import time_step
  from tf_agents.trajectories import trajectory
  from tf_agents.utils import common
label_desc: Use image node_id 3 for calling the QtoptAgentTest obj's underlying member method code with example usage: obj.testInitializeAgent() without return types