code: def process(self, msg, kwargs):
      if isinstance(self.extra, dict) and "prefix" in self.extra:
          return f"{self.extra['prefix']} {msg}", kwargs
      return msg, kwargs
  
file_path: nni/nni/contrib/training_service/file_channel.py
imports: from __future__ import annotations
  import logging
  import time
  from pathlib import Path
label_desc: Use image node_id 1 for calling the _PrefixAdapter obj's underlying member method code with example usage: obj.process(msg, kwargs) and returns: msg,  kwargs, self, str, msg,  kwargs