class_docstr: Teacher that builds up Message objects based on child `question and answer` and
  `reason` classes.
  
  Also handles making exemplars.
class_docstr_tok: ["Teacher","that","builds","up","Message","objects","based","on","child","`","question","and","answer","`","and","`","reason","`","classes",".","Also","handles","making","exemplars","."]
code: def get_reason_class(self) -> AbstractReason:
      raise NotImplementedError("Derived class must implement")
  
imports: from parlai.core.opt import Opt
  from parlai.core.message import Message
  from parlai.core.params import ParlaiParser
  from parlai.core.teachers import DialogTeacher
  from tqdm import tqdm
  from typing import Any, Dict, Iterable, List, Optional, Tuple
label_desc: Use image node_id 2 for calling the AbstractReasoningTeacher obj's underlying member method code with example usage: obj.get_reason_class() without return types