code: def test_initial_params(self):
      policy = qtopt_cem_policy.CEMPolicy(
          self._time_step_spec,
          self._action_spec,
          sampler=None,
          init_mean=_MEAN,
          init_var=_VAR,
          q_network=DummyNet((self._obs_spec, self._action_spec)),
      )
  
      mean, var = policy._initial_params(_BATCH)
  
      with self.session(use_gpu=True):
          self.assertAllClose([[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]], mean)
      self.assertAllClose([[0.09, 0.03, 0.05], [0.09, 0.03, 0.05]], var)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl import flags
  from absl import logging
  from absl.testing import parameterized
  import numpy
  import tensorflow
  import tensorflow_probability
  from tf_agents.networks import network
  from tf_agents.policies import qtopt_cem_policy
  from tf_agents.policies.samplers import qtopt_cem_actions_sampler_continuous
  from tf_agents.policies.samplers import qtopt_cem_actions_sampler_continuous_and_one_hot
  from tf_agents.policies.samplers import qtopt_cem_actions_sampler_hybrid
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
label_desc: Use image node_id 3 for calling the CEMPolicyTest obj's underlying member method code with example usage: obj.test_initial_params() without return types