code: def gc_collect():
      # Make sure to cleanup as much as possible between
      # unit tests that share a Ray session
      yield
      gc.collect()
  
imports: import gc
  import threading
  import time
  from tempfile import TemporaryDirectory
  import pytest
  import ray
  from ray import train, tune
  from ray._private.test_utils import wait_for_condition
  from ray._raylet import GcsClient
  from ray.cluster_utils import Cluster
  from ray.core.generated import autoscaler_pb2
  from ray.train import Checkpoint, FailureConfig, RunConfig, ScalingConfig
  from ray.train.data_parallel_trainer import DataParallelTrainer
  from ray.train.trainer import BaseTrainer, TrainingFailedError
  from ray.tune import Tuner, TuneConfig, TuneError
  from ray.tests.conftest import *
  from ray.train.tests.util import create_dict_checkpoint, load_dict_checkpoint
label_desc: Use image node_id 2 for calling a global function with example usage: gc_collect() without return types