code: def test_checkpoint_experiment(self):
      with self.get_provider() as fb:
          (
              experiment,
              experiment_name,
              _,
              _,
          ) = get_test_experiment()
  
          modeldir = experiment.artifacts["modeldir"].local_path
          if os.path.exists(modeldir):
              shutil.rmtree(modeldir)
  
          os.makedirs(modeldir)
          try:
              fb.delete_experiment(experiment_name)
          except BaseException:
              pass
  
          fb.add_experiment(experiment)
          fb.start_experiment(experiment)
  
          file_in_modeldir = os.path.join(modeldir, str(uuid.uuid4()))
          random_str = str(uuid.uuid4())
          with open(file_in_modeldir, "w") as f:
              f.write(random_str)
  
          checkpoint_threads = fb.checkpoint_experiment(experiment)
          if checkpoint_threads:
              for t in checkpoint_threads:
                  t.join()
  
          shutil.rmtree(modeldir)
          fb.store.get_artifact(
              fb.get_experiment(
                  experiment_name, getinfo=False
              ).artifacts["modeldir"]
          )
  
          with open(file_in_modeldir, "r") as f:
              line = f.read()
  
          self.assertTrue(line == random_str)
          fb.delete_experiment(experiment)
  
imports: import unittest
  import inspect
  import yaml
  import uuid
  import os
  import time
  import six
  import shutil
  from studio import model
  from studio.firebase_provider import FirebaseProvider
  from studio.postgres_provider import PostgresProvider
  from studio.db_providers.s3_provider import S3Provider
  from studio.auth import remove_all_keys
  from studio.extra_util import has_aws_credentials
  from env_detect import on_gcp, on_aws
  from model_test import get_test_experiment
label_desc: Use image node_id 10 for calling the KeyValueProviderTest obj's underlying member method code with example usage: obj.test_checkpoint_experiment() without return types