code: def shutdown(self) -> None:
      pass
  
file_path: BigDL/python/nano/src/bigdl/nano/utils/tf/backend.py
imports: import os
  from tempfile import TemporaryDirectory
  from typing import Any
  from bigdl.nano.utils.common import Backend
  from bigdl.nano.utils.common import invalidInputError
label_desc: Use image node_id 2 for calling the MultiprocessingBackend obj's underlying member method code with example usage: obj.shutdown() without return types