code: def str2class(value):
      """
      From import path string, returns the class specified.
  
      For example, the string
      'parlai.agents.hugging_face.dict:Gpt2DictionaryAgent' returns
      <class 'parlai.agents.hugging_face.dict.Gpt2DictionaryAgent'>.
      """
      if ":" not in value:
          raise RuntimeError(
              "Use a colon before the name of the class."
          )
      name = value.split(":")
      module = importlib.import_module(name[0])
      return getattr(module, name[1])
  
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 8 for calling a global function with example usage: str2class(value) and returns: getattr