Updating approximations with dynamic objects based on local multigranulation rough sets in ordered information systems
作者:Wentao Li, Weihua Xu, Xiaoyan Zhang, Jia Zhang
摘要
The main task of local rough set model is to avoid the interference of complicated calculation and invalid information in the formation of approximation space. In this paper, we first present a local rough set model based on dominance relation to make the local rough set theory applicable to the ordered information system, then two kinds of local multigranulation rough set models in the ordered information system are constructed by extending the single granulation environment to a multigranulation case. Moreover, the updating processes of dynamic objects based on global (classical) and local multigranulation rough sets in the ordered information system are analyzed and compared carefully. It is addressed about how the rough approximation spaces of global multigranulation rough set and local multigranulation rough set change when the object set increase or decrease in an ordered information system. The relevant algorithms for updating approximations with dynamic objects on global and local multigranulation rough sets are provided in ordered information systems. To illustrate the superiority and the effectiveness of the proposed dynamic updating approaches in the ordered information system, experimental evaluation is performed using six datasets coming from the University of California-Irvine repository.
论文关键词:Dynamic updating, Local rough set, Multigranulation rough set, Granular computing, Ordered information system
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论文官网地址:https://doi.org/10.1007/s10462-021-10053-9