code: def __init__(self, opt, shared):
      raise RuntimeError(
          f"Default teacher does not exist. Please use one of the subteachers, for example: {MULTITASK_STR}"
      )
  
file_path: ParlAI/parlai/tasks/md_gender/agents.py
imports: from .convai2 import Convai2Teacher
  from .funpedia import FunpediaTeacher
  from .light import LIGHTTeacher
  from .image_chat import ImageChatTeacher
  from .opensubtitles import OpensubtitlesTeacher
  from .wikipedia import WikipediaTeacher
  from .wizard import WizardTeacher
  from .yelp import YelpTeacher
  from .new_data import MdGenderTeacher
  from parlai.core.teachers import create_task_agent_from_taskname
label_desc: Use image node_id 1 to create a new DefaultTeacher object  with example: obj = DefaultTeacher(opt, shared)