code: def register_teacher(name: str) -> Callable[[Type], Type]:
      """
      Register a teacher to be available as a command line.
  
      >>> @register_teacher("my_teacher")
      ... class MyTeacher:
      ...    pass
      """
  
      def _inner(cls_):
          global TEACHER_REGISTRY
          TEACHER_REGISTRY[name] = cls_
          return cls_
  
      return _inner
  
file_path: ParlAI/parlai/core/loader.py
imports: from typing import Callable, Dict, Type, Tuple
  import importlib
  from collections import namedtuple
label_desc: Use image node_id 3 for calling a global function with example usage: register_teacher(name) and returns: _inner, cls_