class_docstr: Teacher for ProsocialDialog Data https://github.com/skywalker023/prosocial-dialog
class_docstr_tok: ["Teacher","for","ProsocialDialog","Data","https",":","\/\/github.com\/skywalker023\/prosocial-dialog"]
code: def num_episodes(self):
      return len(self.json_data)
  
imports: import json
  import os
  from typing import Optional
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.core.teachers import DialogTeacher
  from .build import build
label_desc: Use image node_id 4 for calling the ProsocialDialogTeacher obj's underlying member method code with example usage: obj.num_episodes() and returns: len