code: def testContinueFromUnmanaged(self):
      directory = self.get_temp_dir()
      prefix = os.path.join(directory, "unusual_prefix")
      checkpoint = util.Checkpoint()
      first_path = checkpoint.save(prefix)
      second_path = checkpoint.save(prefix)
      del checkpoint
      checkpoint = util.Checkpoint()
      manager = checkpoint_management.CheckpointManager(
          checkpoint, directory, max_to_keep=2
      )
      checkpoint.restore(manager.latest_checkpoint).run_restore_ops()
      self.assertEqual(2, self.evaluate(checkpoint.save_counter))
      third_path = manager.save()
      self.assertEqual([third_path], manager.checkpoints)
      fourth_path = manager.save()
      self.assertEqual([third_path, fourth_path], manager.checkpoints)
      fifth_path = manager.save()
      self.assertEqual([fourth_path, fifth_path], manager.checkpoints)
      self.assertTrue(
          checkpoint_management.checkpoint_exists(first_path)
      )
      self.assertTrue(
          checkpoint_management.checkpoint_exists(second_path)
      )
      self.assertFalse(
          checkpoint_management.checkpoint_exists(third_path)
      )
      self.assertTrue(
          checkpoint_management.checkpoint_exists(fourth_path)
      )
      self.assertTrue(
          checkpoint_management.checkpoint_exists(fifth_path)
      )
  
imports: import contextlib
  import os
  import pathlib
  import shutil
  import tempfile
  from google.protobuf import text_format
  from tensorflow.core.protobuf import saver_pb2
  from tensorflow.python.checkpoint import checkpoint
  from tensorflow.python.checkpoint import checkpoint_management
  from tensorflow.python.eager import context
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import gfile
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.training import saver
  from tensorflow.python.training.checkpoint_state_pb2 import CheckpointState
label_desc: Use image node_id 4 for calling the CheckpointManagerTest obj's underlying member method code with example usage: obj.testContinueFromUnmanaged() without return types