code: def setUp(self):
      self.absolute_local_dir = None
      ray.init(num_cpus=1, num_gpus=0, local_mode=self.local_mode)
  
imports: import os
  import pickle
  import shutil
  import tempfile
  import unittest
  import pytest
  import ray
  from ray import tune
  from ray.train import CheckpointConfig
  from ray.tune import Trainable
  from ray.tune.utils import validate_save_restore
label_desc: Use image node_id 2 for calling the SerialTuneRelativeLocalDirTest obj's underlying member method code with example usage: obj.setUp() without return types