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