code: def teardown_function(function):
      # Delete environment variable if set.
      if "RAY_ADDRESS" in os.environ:
          del os.environ["RAY_ADDRESS"]
  
imports: import os
  import sys
  import platform
  import pytest
  import tempfile
  import time
  import random
  from collections import defaultdict
  import queue
  import math
  import ray
  from ray._private.test_utils import SignalActor
  from ray.util.multiprocessing import Pool, TimeoutError, JoinableQueue
  from ray.util.joblib import register_ray
  from joblib import parallel_backend, Parallel, delayed
label_desc: Use image node_id 1 for calling a global function with example usage: teardown_function(function) without return types