def normalizer(self, maxweight, top_total):
        f = maxweight * self.N / self.collection_total
        return (maxweight * log(f / (1.0 + f), 2) + log(1.0 + f, 2))
dataset/ETHPy150Open tallstreet/Whoosh-AppEngine/src/whoosh/classify.py/Bo2Model.normalizer/swapped operands of `/`