code: def create_temp_dir(self):
      tmp_dir = tempfile.mkdtemp()
      self.tmp_dirs.append(tmp_dir)
      return tmp_dir
  
file_path: BigDL/python/orca/src/bigdl/orca/test_zoo_utils.py
imports: from __future__ import print_function
  import logging
  import shutil
  from unittest import TestCase
  from bigdl.dllib.nncontext import *
  from bigdl.dllib.feature.image import ImageSet
  from bigdl.dllib.utils.log4Error import *
label_desc: Use image node_id 3 for calling the ZooTestCase obj's underlying member method code with example usage: obj.create_temp_dir() and returns: tmp_dir