code: def publish_msg(
      self,
      msg_type: str,
      data: MaybeDict = None,
      metadata: MaybeDict = None,
      buffers: BuffersType = None,
      **keys: Any,
  ) -> None:
      pass
  
file_path: catboost/contrib/python/comm/comm/__init__.py
imports: from __future__ import annotations
  from typing import Any
  from .base_comm import BaseComm, BuffersType, CommManager, MaybeDict
label_desc: Use image node_id 1 for calling the DummyComm obj's underlying member method code with example usage: obj.publish_msg(msg_type, data, metadata, buffers) without return types