where from meaning in English

从何而来

Oh . where from
哦，哪里来的
Experiments show that fpmine runs two times as fast as the most recently proposed algorithm fp - growth and saves half the memory ; moreover , our algorithm has a quite good time and space scalability with the number of transactions , and has an excellent performance in dense database mining as well ; spf has excellent time and space efficiency ; fpmine - spf algorithm has a far taster speed in association rules mining than the widely used apriori algorithm and has wonderful scalability . association rules mining always generates too many rules , which makes ii difficult to pick the valuable rules where from
实验表明，在相同数据集上，与fp - growth算法相比，算法fpmine的挖掘速度提高了一倍以上，而所需的存储空间减少了一半；随着数据库规模的增大，算法fpmine具有很好的可伸缩性；对于稠密数据集，本文算法也具有良好的性能； spf算法具有极好的时空效率； fpmine - spf算法挖掘关联规则的速度远快于较长期以来广泛使用的apriori算法，并有相当好的可伸缩性。