1. ALISR Laboratory, College of Computer and Information Sciences; King Saud University; Riyadh 11543 Saudi Arabia
2. Department of Information Engineering and Computer Science; University of Trento; Via Sommarive, 14 I-38123 Trento Italy
3. Machine Intelligence Institute; Iona College; New Rochelle NY 10801 USA
4. King Saud University; Riyadh Saudi Arabia