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dc.contributor.authorRosales Pérez, Alejandro
dc.contributor.authorGarcía López, Salvador 
dc.contributor.authorHerrera Triguero, Francisco
dc.identifier.citationPublished version: A. Rosales-Pérez, S. García and F. Herrera, "Handling Imbalanced Classification Problems With Support Vector Machines via Evolutionary Bilevel Optimization," in IEEE Transactions on Cybernetics, doi: [10.1109/TCYB.2022.3163974]es_ES
dc.descriptionThis work was partially supported by Project PID2020-119478GBI00 funded by MICINN/AEI/10.13039/501100011033 and by Project A-TIC-434-UGR20 funded by FEDER/Junta de Andaluc´ıa- Consejer´ıa de Transformaci´on Econ´omica, Industria, Conocimiento y Universidades. The authors acknowledge the support from “Laboratorio de Superc´omputo del Baj´ıo” through project 300832 from CONACyT.es_ES
dc.description.abstractSupport vector machines are popular learning algorithms to deal with binary classification problems. They traditionally assume equal misclassification costs for each class; however, real-world problems may have an uneven class distribution. This paper introduces EBCS-SVM: Evolutionary Bilevel Costsensitive Support Vector Machines. EBCS-SVM handles imbalanced classification problems by simultaneously learning the support vectors and optimizing the SVM hyper-parameters, which comprise the kernel parameter and misclassification costs. The resulting optimization problem is a bilevel problem, where the lower-level determines the support vectors and the upper-level the hyper-parameters. This optimization problem is solved using an evolutionary algorithm at the upper-level and Sequential Minimal Optimization at the lower-level. These two methods work in a nested fashion, i.e., the optimal support vectors help guide the search of the hyper-parameters, and the lower-level is initialized based on previous successful solutions. The proposed method is assessed using 70 datasets of imbalanced classification and compared with several state-of-the-art methods. The experimental results, supported by a Bayesian test, provided evidence of the effectiveness of EBCS-SVM when working with highly imbalanced datasets.es_ES
dc.description.sponsorshipPID2020-119478GBI00 funded by MICINN/AEI/10.13039/501100011033es_ES
dc.description.sponsorshipA-TIC-434-UGR20 funded by FEDER/Junta de Andaluc´ıa- Consejer´ıa de Transformaci´on Econ´omica, Industria, Conocimiento y Universidadeses_ES
dc.description.sponsorship300832 from CONACyTes_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subjectSupport Vector Machineses_ES
dc.subjectImbalanced classificationes_ES
dc.subjectData Preprocessinges_ES
dc.subjectEvolutionary algorithmses_ES
dc.subjectBilevel optimizationes_ES
dc.titleHandling Imbalanced Classification Problems with Support Vector Machines via Evolutionary Bilevel Optimizationes_ES

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Atribución-NoComercial-SinDerivadas 3.0 España
Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 España