南京大学学报(自然科学版) ›› 2023, Vol. 59 ›› Issue (6): 10341047.doi: 10.13232/j.cnki.jnju.2023.06.013
• • 上一篇
Ming Jin1, Jinkun Chen1,2(), SunYachao1
摘要:
由于现实世界中属性具有多层次多尺度,因此多尺度决策表的概念被提出.目前对多尺度决策表的研究大多集中在最优尺度组合上,但通过最优尺度组合得到的并不是一个真正的约简集,仍需再次进行属性约简,因此可能会导致求约简的时间较长.为此考虑利用边界域条件熵直接求最优尺度约简.首先,引入多尺度决策表中最优尺度约简的定义,给出多种最优尺度约简的定义,探讨在协调和不协调两种背景下几种最优尺度约简之间的关系.其次,给出多尺度决策表中边界域条件熵的定义,讨论边界域条件熵的若干性质以及与约简的关系.最后,给出基于边界域条件熵的最优尺度约简算法,并用实验验证该方法的有效性.
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