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