Granular Description With Multigranularity for Multidimensional Data: A Cone-Shaped Fuzzy Set-Based Method

Wei Lu

doi:10.1109/TFUZZ.2020.2985335

2021-07-01

DOI：10.1109/TFUZZ.2020.2985335

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摘要

En 中文

Information granules are fundamental, abstract, and easy-to-operate constructs supporting the human-centered handling way in granular computing (GrC). One of the basic properties of information granules comes with its hierarchy. Information granularity is the quantification expression of hierarchy of an information granule. Forming information granules with multigranularity to hierarchically describe the nature of data is an important task in GrC. In this article, a cone-shaped fuzzy set-based granular description method with multigranularity is proposed for multidimensional data. Its fundamental idea is to realize the synergy of quantification of information granularity and a hierarchical description of data bymeans of alpha-cuts of cone-shaped fuzzy sets. The proposed method first partition the entire data set into a series of data chunks. Then, some mutually nonoverlapping cone-shaped fuzzy sets are constructed by optimally determining their cores and support radii in terms of the coverage of alpha-cuts of these fuzzy sets to the data located in individual chunks and the corresponding specificity. Finally, by implementing alpha-cuts processing for these constructed cone-shaped fuzzy sets, a collection of families of hyper-spherical information granules used to hierarchically describe the structural characteristics of the data set are completely emerged. Besides, the quality of the resulting families of hyper-spherical information granules is evaluated along the granular perspective and the application perspective, respectively. A series of experimental studies concerning several synthetic and publicly available data sets are covered. The experimental results demonstrate the superiority of the proposed granular description method of data with multigranularity.

Keyword:

alpha-cuts of fuzzy set

cone-shaped fuzzy sets

granular computing (GrC)

granular description

hyper-spherical information granules

multigranularity