code: def barrier_mode(cls, value):
      assert isinstance(
          value, bool
      ), "barrier_mode should either be True or False"
      cls._barrier_mode = value
  
imports: from bigdl.util.common import *
  from zoo.common.utils import callZooFunc
  from zoo.util.utils import set_python_home
  import warnings
  import multiprocessing
  import os
  import threading
  import sys
label_desc: Use image node_id 4 for calling the ZooContextMeta obj's underlying member method code with example usage: obj.barrier_mode(cls, value) without return types