code: def testInitializeAndShutdown(self):
      if not jtu.test_device_matches(["gpu"]):
          self.skipTest("Test only works with GPUs.")
      # Tests the public APIs. Since they use global state, we cannot use
      # concurrency to simulate multiple tasks.
      port = portpicker.pick_unused_port()
      jax.distributed.initialize(
          coordinator_address=f"localhost:{port}",
          num_processes=1,
          process_id=0,
      )
      jax.distributed.shutdown()
  
imports: import contextlib
  import os
  import shutil
  import subprocess
  import sys
  import threading
  import unittest
  import functools
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import jax
  from jax import config
  from jax._src import core
  from jax._src import distributed
  from jax._src import maps
  from jax._src import test_util
  from jax._src import util
  from jax.experimental import pjit
  import jax.numpy
label_desc: Use image node_id 1 for calling the DistributedTest obj's underlying member method code with example usage: obj.testInitializeAndShutdown() without return types