计算机科学 ›› 2019, Vol. 46 ›› Issue (12): 257-260.doi: 10.11896/jsjkx.181102137
李仲玲1, 米据生2,3, 解滨4
LI Zhong-ling1, MI Ju-sheng2,3, XIE Bin4
摘要: 形式概念分析由德国数学家Wille于1982年提出,是刻画概念和概念之间层次化结构的数据分析工具,主要用于概念的发现、排序和显示。作为知识发现的有效工具,该理论已被成功地运用到信息检索、数据挖掘、模式识别等领域。而在实际问题中呈现出的形式背景往往具有冗余的属性,使得所生成的概念格结构非常复杂。为了提取更加简洁有效的概念格,需要对形式背景中的属性进行约简。因此,寻找更高效的属性约简方法成为了形式概念分析中的一个重要研究问题。文中把基于粗糙集理论的属性约简思想引入到形式背景中,进一步研究不协调决策形式背景的属性约简问题。一些学者在不协调信息系统中基于等价类提出了分布约简、最大分布约简、分配约简、近似约简,并且讨论了4个约简之间的关系。而形式背景是一种特殊的信息系统,文中用粒集代替信息系统中的等价类,提出了4种基于包含度的属性约简,即分布约简、最大分布约简、分配约简与上近似和约简,并证明了分布协调集必为最大分布协调集,分布协调集必为分配协调集,分配协调集与上近似和协调集等价等结论。最后以分配约简为例,给出了分配协调集的判定定理,构建了不同粒集之间的可辨识属性集合,得到了求解分配约简的布尔计算方法。
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