code: def write(self, cfg):
      with open(self.CFG_F, "w") as f:
          f.write(cfg)
  
imports: import unittest
  from onmt.translate.translation_server import ServerModel, TranslationServer
  import os
  from textwrap import dedent
  import torch
  from onmt.translate.translator import Translator
label_desc: Use image node_id 2 for calling the TestTranslationServer obj's underlying member method code with example usage: obj.write(cfg) without return types