code: def __init__(self, opt, shared=None):
      if not hasattr(self, "prefix"):
          self.prefix = ""
          self.suffix = (
              "train" if opt["datatype"].startswith("train") else "dev"
          )
  
      if not hasattr(self, "no_evidence"):
          self.no_evidence = False
      qa_dir, self.evidence_dir = _path(opt)
      opt["datafile"] = os.path.join(
          qa_dir, self.prefix + "wikipedia-" + self.suffix + ".json"
      )
  
      self.id = "triviaqa"
      super().__init__(opt, shared)
  
imports: from parlai.core.teachers import DialogTeacher, MultiTaskTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import copy
  import json
  import os
label_desc: Use image node_id 1 to create a new WikipediaTeacher object from inherited base classes: DialogTeacher with example: obj = WikipediaTeacher(opt, shared)