1. Department of Intelligent Systems, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia. E-mails: bostjan.kaluza@ijs.si, matjaz.gams@ijs.si, mitja.lustrek@ijs.si
2. Jožef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia