code: def testDiagnoseSerialization(self):
      # this is not serializable
      e = threading.Event()
  
      def test(config):
          print(e)
  
      assert diagnose_serialization(test) is not True
  
      # should help identify that 'e' should be moved into
      # the `test` scope.
  
      # correct implementation
      def test(config):
          e = threading.Event()
          print(e)
  
      assert diagnose_serialization(test) is True
  
imports: import threading
  import unittest
  import ray
  import ray.train
  from ray.train import CheckpointConfig
  from ray.tune import register_trainable
  from ray.tune.experiment import Experiment, _convert_to_experiment_list
  from ray.tune.error import TuneError
  from ray.tune.utils import diagnose_serialization
label_desc: Use image node_id 1 for calling the ValidateUtilTest obj's underlying member method code with example usage: obj.testDiagnoseSerialization() without return types