class_docstr: Safety Teacher for ProsocialDialog Data https://github.com/skywalker023/prosocial-dialog
  set --one-turn to true for just one turn without the context.
class_docstr_tok: ["Safety","Teacher","for","ProsocialDialog","Data","https",":","\/\/github.com\/skywalker023\/prosocial-dialog","set","--","one-turn","to","true","for","just","one","turn","without","the","context","."]
code: def num_examples(self):
      return sum([len(x) for x in 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 5 for calling the ProsocialDialogSafetyTeacher obj's underlying member method code with example usage: obj.num_examples() and returns: sum