In covering information systems,to explore multigranularity reduction structures,this pa-per calculates pessimistic multigranularity reductions for covering information systems through dis-cernibility matrices.First,we introduce the definition of attribute reduction based on pessimistic mul-tigranulation rough sets in covering information systems.Second,we construct the discernibility ma-trices and discernibility functions.By performing disjunction and conjunction operations on the dis-cernibility matrix,all pessimistic multigranulation reductions of covering information systems can be precisely obtained.Finally,numerical experiments using 10 datasets from UCI are given to verify the feasibility and effectiveness of the proposed algorithms.
multigranulationcovering information systemdiscernibility matrixattribute reduction
维普
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