code: def testBuild(self):
      policy = py_tf_policy.PyTFPolicy(self._tf_policy)
      expected_time_step_spec = ts.time_step_spec(
          tensor_spec.to_nest_array_spec(self._obs_spec)
      )
      expected_action_spec = tensor_spec.to_nest_array_spec(
          self._action_spec
      )
      self.assertEqual(expected_time_step_spec, policy.time_step_spec)
      self.assertEqual(expected_action_spec, policy.action_spec)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from absl import flags
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.networks import network
  from tf_agents.policies import actor_policy
  from tf_agents.policies import ou_noise_policy
  from tf_agents.policies import py_tf_policy
  from tf_agents.policies import q_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 2 for calling the PyTFPolicyTest obj's underlying member method code with example usage: obj.testBuild() without return types