reduction n. 1.缩小,减少;降级,降位;(刑罚等的)轻减;减速;减价,折扣。 2.(城市、国家等的)陷落,投降,被征服、变成 (to; into)。 3.破落,没落;【物理学】衰减。 4.类别;碎矿;提炼。 5.【数学】简化,约简,缩减;化归。 6.(测量结果的)整理,(代号等的)译解;【无线电】订正。 7.【化学】还原法,改格法;【摄影】减薄。 a 10% reduction 九折。 great reductions in prices 大减价。 the reduction of armaments 裁(减)军(备)。 ascending [descending] reduction 由小[大]单位改成大[小]单位的换算法。 reduction to absurdity=reductio ad absurdum.
In this thesis , we derive probabilistic pca , which we call it t - ppca , for data sampled from the finite mixture of multivariate t - distributions , whereby we obtain a new general - purpose dimension reduction algorithm which is of some importance in both theory and application 在此学位论文中,我们将gaussian - ppca推广为基于多元t分布的概率pca (下文称为t - ppca ) ,从而得到了一类无论在理论上还是在实际应用中均具有较大意义的通用数据降维算法。
Introduce the algorithm of attribute reduction based on discernibility matrix and through analyzing to find the shortage , and then present an improved algorithm . the heuristic reduction algorithm based on the feature weight is more natural and easier in computation and improves the reduction algorithm in speed 将启发性知识结合区分矩阵,提出了基于属性特征权值的区分矩阵的启发式约简算法,较以往的算法意义更加直观,计算也更加简单,提高了约简算法的速度。
The paper discusses the reason first , then introduces another improvement based on sorting and auxiliary space used to save the information obtained from attributes to jelonek ' s attribute reduction algorithm , which reduces the time complexity of jelonek ' s attribute reduction algorithm further than in [ 3 ] while getting the same result as jelonek ' s attribute reduction algorithm 本文探讨了此算法不理想的原因,提出一种新方法改进jelonek算法,主要通过辅助空间保存属性的信息和采用排序,在保证和jelonek算法结果相同的情况下比第三章参考文献[ 3 ]更进一步降低了jelonek算法的时间复杂度。