code: def testInitializeRestoreVariableCollection(self):
      if not tf.executing_eagerly():
          self.skipTest("Test only works in eager mode.")
      context_dim = 7
      num_actions = 5
      variable_collection = linear_agent.LinearBanditVariableCollection(
          context_dim=context_dim, num_models=num_actions
      )
      self.evaluate(tf.compat.v1.global_variables_initializer())
      self.evaluate(variable_collection.num_samples_list)
      checkpoint = tf.train.Checkpoint(
          variable_collection=variable_collection
      )
      checkpoint_dir = self.get_temp_dir()
      checkpoint_prefix = os.path.join(checkpoint_dir, "checkpoint")
      checkpoint.save(file_prefix=checkpoint_prefix)
  
      variable_collection.num_samples_list[2].assign(14)
  
      latest_checkpoint = tf.train.latest_checkpoint(checkpoint_dir)
      checkpoint_load_status = checkpoint.restore(latest_checkpoint)
      self.evaluate(checkpoint_load_status.initialize_or_restore())
      self.assertEqual(
          self.evaluate(variable_collection.num_samples_list[2]), 0
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from typing import Optional, Tuple
  from absl import flags
  from absl.testing import parameterized
  import numpy
  import tensorflow
  import tensorflow_probability
  from tf_agents.bandits.agents import lin_ucb_agent
  from tf_agents.bandits.agents import linear_bandit_agent
  from tf_agents.bandits.agents import linear_thompson_sampling_agent
  from tf_agents.bandits.agents import utils
  from tf_agents.bandits.drivers import driver_utils
  from tf_agents.bandits.specs import utils
  from tf_agents.policies import utils
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import policy_step
  from tf_agents.trajectories import time_step
  from tf_agents.typing import types
  from tf_agents.utils import common
label_desc: Use image node_id 13 for calling the LinearBanditAgentTest obj's underlying member method code with example usage: obj.testInitializeRestoreVariableCollection() without return types