code: def testGaussianDistribution(self):
      actor_network = DummyActionDistributionNet(
          self._obs_spec, self._action_spec
      )
      policy = actor_policy.ActorPolicy(
          self._time_step_spec,
          self._action_spec,
          actor_network=actor_network,
      )
  
      distribution_step = policy.distribution(self._time_step_batch)
      self.assertIsInstance(
          distribution_step.action, tfp.distributions.Normal
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  import tensorflow
  import tensorflow_probability
  from tf_agents.networks import actor_distribution_network
  from tf_agents.networks import network
  from tf_agents.policies import actor_policy
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
  from tf_agents.utils import test_utils
label_desc: Use image node_id 8 for calling the ActorPolicyTest obj's underlying member method code with example usage: obj.testGaussianDistribution() without return types