code: def setUp(self):
      self.save_dir = os.getcwd()
      new_dir = os.path.dirname(__file__)
      if new_dir:
          os.chdir(new_dir)
  
imports: import unittest
  import os
  import re
  from .test_common import BaseTestCase
label_desc: Use image node_id 2 for calling the GPT2FuncTestCase obj's underlying member method code with example usage: obj.setUp() without return types