code: def testRelativePath(self):
      # Make sure we have a clean directory to work in.
      with self.tempDir() as tempdir:
          # Jump to that directory until this test is done.
          with self.tempWorkingDir(tempdir):
              # Save training snapshots to a relative path.
              traindir = "train"
              os.mkdir(traindir)
  
              filename = "snapshot"
              filepath = os.path.join(traindir, filename)
  
              with self.cached_session() as sess:
                  # Build a simple graph.
                  v0 = variables.Variable(0.0)
                  inc = v0.assign_add(1.0)
  
                  save = saver_module.Saver({"v0": v0})
  
                  # Record a short training history.
                  self.evaluate(
                      variables.global_variables_initializer()
                  )
                  save.save(sess, filepath, global_step=0)
                  self.evaluate(inc)
                  save.save(sess, filepath, global_step=1)
                  self.evaluate(inc)
                  save.save(sess, filepath, global_step=2)
  
              with self.cached_session() as sess:
                  # Build a new graph with different initialization.
                  v0 = variables.Variable(-1.0)
  
                  # Create a new saver.
                  save = saver_module.Saver({"v0": v0})
                  self.evaluate(
                      variables.global_variables_initializer()
                  )
  
                  # Get the most recent checkpoint name from the training history file.
                  name = checkpoint_management.latest_checkpoint(
                      traindir
                  )
                  self.assertIsNotNone(name)
  
                  # Restore "v0" from that checkpoint.
                  save.restore(sess, name)
                  self.assertEqual(self.evaluate(v0), 2.0)
  
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 LatestCheckpointWithRelativePaths obj's underlying member method code with example usage: obj.testRelativePath() without return types