Skip to main content

Research Repository

Advanced Search

Instance reduction for one-class classification


Bartosz Krawczyk


Micha? Wo?niak

Francisco Herrera


Instance reduction techniques are data preprocessing methods originally developed to enhance the nearest neighbor rule for standard classification. They reduce the training data by selecting or generating representative examples of a given problem. These algorithms have been designed and widely analyzed in multi-class problems providing very competitive results. However, this issue was rarely addressed in the context of one-class classification. In this specific domain a reduction of the training set may not only decrease the classification time and classifier’s complexity, but also allows us to handle internal noisy data and simplify the data description boundary. We propose two methods for achieving this goal. The first one is a flexible framework that adjusts any instance reduction method to one-class scenario by introduction of meaningful artificial outliers. The second one is a novel modification of evolutionary instance reduction technique that is based on differential evolution and uses consistency measure for model evaluation in filter or wrapper modes. It is a powerful native one-class solution that does not require an access to counterexamples. Both of the proposed algorithms can be applied to any type of one-class classifier. On the basis of extensive computational experiments, we show that the proposed methods are highly efficient techniques to reduce the complexity and improve the classification performance in one-class scenarios.


Krawczyk, B., Triguero, I., García, S., Wo┼║niak, M., & Herrera, F. (in press). Instance reduction for one-class classification. Knowledge and Information Systems,

Journal Article Type Article
Acceptance Date Apr 27, 2018
Online Publication Date May 21, 2018
Deposit Date May 29, 2018
Publicly Available Date May 22, 2019
Journal Knowledge and Information Systems
Print ISSN 0219-1377
Electronic ISSN 0219-1377
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Keywords Machine learning ; One-class classification ; Instance reduction ; Training set selection ; Evolutionary computing
Public URL
Publisher URL
Additional Information This is a pre-print of an article published in Knowledge and Information Systems. The final authenticated version is available online at:


You might also like

Downloadable Citations