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