class_docstr: ReDial Teacher.
class_docstr_tok: ["ReDial","Teacher","."]
code: def num_episodes(self):
      return len(self.episodes)
  
imports: from parlai.core.teachers import FixedDialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import json
  import re
  import csv
label_desc: Use image node_id 7 for calling the ReDialTeacher obj's underlying member method code with example usage: obj.num_episodes() and returns: len