1. ICAM (Institut Catholique d’Arts et Metiers) School of Engineering, Toulouse Campus, 75 av. de Grande Bretagne, CS 97615, CEDEX 3, 31076 Toulouse, France
2. Lab-STICC, CNRS UMR 6285, ENSTA (Ecole Nationale Superieure de Techniques Avancees), 29806 Brest, France
3. Department of Computer Science and Artificial Intelligence, University of the Basque Country UPV/EHU,
20018 San Sebastian, Spain
4. IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain