code: def _to_dict(self):
          
          _dict = {}
          if hasattr(self, 'text') and self.text is not None:
              _dict['text'] = self.text
          if hasattr(self, 'entities') and self.entities is not None:
              _dict['entities'] = [x._to_dict() for x in self.entities]
          if hasattr(self, 'keywords') and self.keywords is not None:
              _dict['keywords'] = [x._to_dict() for x in self.keywords]
          return _dict
docs: Return a json dictionary representing this model.