code: def num_episodes(self):
      return self.num_eps
  
imports: from parlai.core.teachers import DialogTeacher, FixedDialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import csv
  import random
  import os
label_desc: Use image node_id 2 for calling the MultiturnTeacher obj's underlying member method code with example usage: obj.num_episodes() and returns: self