class_docstr: ReDial Teacher.
class_docstr_tok: ["ReDial","Teacher","."]
code: def num_examples(self):
      examples = 0
      for data in self.episodes:
          examples += len(data) // 2
      return examples
  
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 6 for calling the ReDialTeacher obj's underlying member method code with example usage: obj.num_examples() and returns: examples