@property
def avg(self):
    if (self.count == 0):
        return 0.0
    self.scorer.sys = self.hypo_sum
    self.scorer.ref = self.target_sum
    return self.scorer.score()
@property
def avg(self):
    if (self.count == 0):
        return 0.0
    self.scorer.sys = self.hypo_sum
    self.scorer.ref = self.target_sum
    return self.scorer.score()