code: def create_temp_dir(self):
      tmp_dir = tempfile.mkdtemp()
      self.tmp_dirs.append(tmp_dir)
      return tmp_dir
  
imports: from __future__ import print_function
  import logging
  import shutil
  from unittest import TestCase
  import keras.backend
  from zoo.common.nncontext import *
  from zoo.feature.image import ImageSet
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