code: def test_redefining_remote_functions(shutdown_only):
      ray.init(num_cpus=1)
  
      # Test that we can define a remote function in the shell.
      @ray.remote
      def f(x):
          return x + 1
  
      assert ray.get(f.remote(0)) == 1
  
      # Test that we can redefine the remote function.
      @ray.remote
      def f(x):
          return x + 10
  
      while True:
          val = ray.get(f.remote(0))
          assert val in [1, 10]
          if val == 10:
              break
          else:
              logger.info(
                  "Still using old definition of f, trying again."
              )
  
      # Check that we can redefine functions even when the remote function source
      # doesn't change (see https://github.com/ray-project/ray/issues/6130).
      @ray.remote
      def g():
          return nonexistent()
  
      with pytest.raises(RayTaskError, match="nonexistent"):
          ray.get(g.remote())
  
      def nonexistent():
          return 1
  
      # Redefine the function and make sure it succeeds.
      @ray.remote
      def g():
          return nonexistent()
  
      assert ray.get(g.remote()) == 1
  
      # Check the same thing but when the redefined function is inside of another
      # task.
      @ray.remote
      def h(i):
          @ray.remote
          def j():
              return i
  
          return j.remote()
  
      for i in range(20):
          assert ray.get(ray.get(h.remote(i))) == i
  
imports: import array
  import logging
  import os
  import random
  import subprocess
  import sys
  import tempfile
  import threading
  import time
  from unittest.mock import MagicMock, patch
  import pytest
  from ray._private.ray_constants import KV_NAMESPACE_FUNCTION_TABLE
  from ray._private.test_utils import client_test_enabled
  from ray.cluster_utils import Cluster, cluster_not_supported
  from ray.exceptions import GetTimeoutError, RayTaskError
  from ray.tests.client_test_utils import create_remote_signal_actor
label_desc: Use image node_id 3 for calling a global function with example usage: test_redefining_remote_functions(shutdown_only) and returns: unknown, unknown, nonexistent, int, nonexistent, j, i