Density-based clustering methods are known to be robust against outliers in data; however, they are sensitive to user-speci??ed\r\nparameters, the selection of which is not trivial. Moreover, relational data clustering is an area that has received considerably less\r\nattention than object data clustering. In this paper, two approaches to robust density-based clustering for relational data using\r\nevolutionary computation are investigated.
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