code: def ray_cluster():
      cluster = Cluster()
      yield Cluster()
      serve.shutdown()
      ray.shutdown()
      cluster.shutdown()
  
imports: import os
  import random
  import subprocess
  import tempfile
  import pytest
  import requests
  import ray
  from ray import serve
  from ray._private.test_utils import wait_for_condition
  from ray._private.usage import usage_lib
  from ray.cluster_utils import AutoscalingCluster, Cluster
  from ray.serve._private import api
  from ray.serve._private.test_utils import TELEMETRY_ROUTE_PREFIX, check_ray_stopped
  from ray.serve.context import _get_global_client
  from ray.tests.conftest import propagate_logs, pytest_runtest_makereport
label_desc: Use image node_id 2 for calling a global function with example usage: ray_cluster() without return types