code: def _push_nested_data(
      self, server_address: Optional[Text] = None
  ) -> None:
      # Create Python client.
      address = server_address or self._server_address
      client = reverb.Client(address)
      with client.writer(1) as writer:
          writer.append(
              [
                  np.array(0, dtype=np.int64),
                  np.array([1, 1], dtype=np.float64),
                  np.array([[2], [3]], dtype=np.int32),
              ]
          )
          writer.create_item(
              reverb_variable_container.DEFAULT_TABLE, 1, 1.0
          )
      self.assertEqual(
          client.server_info()[
              reverb_variable_container.DEFAULT_TABLE
          ].current_size,
          1,
      )
  
imports: from typing import Optional, Text, Tuple
  from absl import logging
  from absl.testing import parameterized
  import numpy
  import portpicker
  import reverb
  import tensorflow.compat.v2
  from tf_agents.experimental.distributed import reverb_variable_container
  from tf_agents.system import system_multiprocessing
  from tf_agents.typing import types
  from tf_agents.utils import nest_utils
  from tf_agents.utils import test_utils
label_desc: Use image node_id 18 for calling the ReverbVariableContainerTest obj's underlying member method code with example usage: obj._push_nested_data(server_address) without return types