集值信息系统基于极大变精度相容类的属性约简

Attribute Reduction of Set-valued Information System Based on Maximal Variable Precision Tolerance Classes

集值信息系统中对象的属性集值一般不唯一,基于集值信息系统上的变精度相容关系,给出了极大变精度相容类及其对应的粗糙集模型的定义,并以极大变精度相容类为基础,讨论了集值信息系统的属性约简及其相应的区分函数计算方法.

Some objects in set-valued information systems may have more than one values for some attributes,the concepts of maximal variable precision tolerance classes and rough set model are defined based on variable precision tolerance relations. By using them,an attribute reduction of set-valued information systems is discussed,corresponding computation method of their discernibility fuctions is given.