code: def testRenamedSignatures(self):
      time_step_spec = self._time_step_spec._replace(
          observation=tensor_spec.BoundedTensorSpec(
              dtype=tf.float32, shape=(4,), minimum=-10.0, maximum=10.0
          )
      )
  
      network = q_network.QNetwork(
          input_tensor_spec=time_step_spec.observation,
          action_spec=self._action_spec,
      )
  
      policy = q_policy.QPolicy(
          time_step_spec=time_step_spec,
          action_spec=self._action_spec,
          q_network=network,
      )
  
      train_step = common.create_variable("train_step", initial_value=7)
      saver = policy_saver.PolicySaver(
          policy, train_step=train_step, batch_size=None
      )
      action_signature_names = [
          s.name for s in saver._signatures["action"].input_signature
      ]
      self.assertAllEqual(
          ["0/step_type", "0/reward", "0/discount", "0/observation"],
          action_signature_names,
      )
      initial_state_signature_names = [
          s.name
          for s in saver._signatures[
              "get_initial_state"
          ].input_signature
      ]
      self.assertAllEqual(["batch_size"], initial_state_signature_names)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import os
  import shutil
  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 q_network
  from tf_agents.networks import q_rnn_network
  from tf_agents.policies import actor_policy
  from tf_agents.policies import policy_saver
  from tf_agents.policies import q_policy
  from tf_agents.policies import tf_policy
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import policy_step
  from tf_agents.trajectories import time_step
  from tf_agents.utils import common
  from tf_agents.utils import test_utils
label_desc: Use image node_id 3 for calling the PolicySaverTest obj's underlying member method code with example usage: obj.testRenamedSignatures() without return types