code: def class2str(value):
      """
      Inverse of params.str2class().
      """
      s = str(value)
      s = s[s.find("'") + 1 : s.rfind("'")]  # pull out import path
      s = ":".join(s.rsplit(".", 1))  # replace last period with ':'
      return s
  
imports: import argparse
  import importlib
  import os
  import sys
  import datetime
  import parlai
  import parlai.utils.logging
  from parlai.core.build_data import modelzoo_path
  from parlai.core.loader import load_teacher_module, load_agent_module, load_world_module
  from parlai.tasks.tasks import ids_to_tasks
  from parlai.core.opt import Opt
  from parlai.utils.io import PathManager
  from typing import List, Optional
label_desc: Use image node_id 9 for calling a global function with example usage: class2str(value) and returns: s