Enhancing instance-level constrained clustering through differential evolution

TitleEnhancing instance-level constrained clustering through differential evolution
Publication TypeJournal Article
Year of Publication2021
AuthorsGonzález-Almagro, Germán, Luengo Julián, Cano J. R., and García Salvador
JournalApplied Soft Computing
KeywordsCannot-link, constrained clustering, Differential evolution, Instance-level, Must-link

Clustering has always been a powerful tool in knowledge discovery. Traditionally unsupervised, it received renewed attention when it was shown to produce better results when provided with new types of information, thus leading to a new kind of semi-supervised learning: constrained clustering. This technique is a generalization of traditional clustering that considers additional information encoded by constraints. Constraints can be given in the form of instance-level must-link and cannot-link constraints, which this paper focuses on. We propose the first application of Differential Evolution to the constrained clustering problem, which has proven to produce a better exploration–exploitation trade-off when comparing with previous approaches. We will compare the results obtained by this proposal to those obtained by previous nature-inspired techniques and by some of the state-of-the-art algorithms on 25 datasets with incremental levels of constraint-based information, supporting our conclusions with the aid of Bayesian statistical tests.


TIN2017-89517-P; PP2019.PRI.I.06.