Abstract
Purpose This paper sets out to design hyperbox classifiers of high interpretation capabilities. They are based on a collection of hyperboxes generic and highly interpretable geometric descriptors of data belonging to a certain class. Such hyperboxes directly translate into conditional statements rules taking on the wellknown format if feature1 assumes values in a,b and feature2 assumes values in d,f and and featuren assumes values in w,z then class where the intervals a,b,w,z are the respective edges features of the corresponding hyperbox. Designmethodologyapproach The proposed design process of hyperboxes consists of two main phases. In the first phase, a collection of seeds of the hyperboxes is constructed through data clustering being realized by means of the fuzzy Cmeans algorithm. During the second phase, the hyperboxes are grown expanded by applying mechanisms of genetic optimization and genetic algorithm, in particular. Findings It is demonstrated how the underlying geometry of the hyperboxes supports an immediate interpretation of arrhythmia data by linking the ranges of the features parameters of the ECG signal forming the edges of the hyperboxes with the two classes of the signals normal abnormal. A collection of comprehensive experiments offers an interesting insight into the geometry of the individual categories of the ECG signals and discusses how the resulting hyperbox classifiers link their geometric properties with the obtained classification rates. Research limitationsimplications The structure of the classifier is essential to enhance interpretation capabilities of the architecture and generate a collection of ifthen classification rules. Originalityvalue The study addresses an issue of design of highly interpretable, granular classifiers with the use of the technology of computational intelligence and evolutionary optimization, in particular.