def _to_dict(self):
        """Return a json dictionary representing this model."""
        _dict = {}
        if hasattr(self, 'text') and self.text is not None:
            _dict['text'] = self.text
        if hasattr(self, 'score') and self.score is not None:
            _dict['score'] = self.score
        return _dict
Return a json dictionary representing this model.