code: def pwm_max_score(self):
          
          if self.max_score is None:
              score = 0
              for row in self.pwm:
                  score += log(max(row) / 0.25 + 0.01)
              self.max_score = score
          
          return self.max_score
docs: Return the maximum PWM score.
  
          Returns
          -------
          score : float
              Maximum PWM score.