1. Computer Science Department, Ben Gurion University, Ben Gurion Road 1, mailbox 653 Beer Sheva, 8410501, Israel.
2. INSAIT Institute, Synergy Tower, Sofia Tech Park, blvd. Tsarigradsko shose 111R, 1784 Sofia, Bulgaria, and Computer Science Department, ETH Zurich, OAT, Andreasstrasse 5, 8092 Zürich, Switzerland.
3. Microsoft Research & MIT, 32 Vassar st #G682, Cambridge, MA 02421 USA.
4. Google Research, Google Gradient Canopy, 2000 N Shoreline Blvd, Mountain View, CA 94043 USA.
5. Department of Computer Science at Princeton University, 35 Olden st, Princeton, NJ 08544 USA.
6. Informatics Institute, University of Amsterdam, Science Park 900, Amsterdam, North-Holland, NL 1098 XX, The Netherlands.
7. School of Technology and Computer Science, Tata Institute of Fundamental Research, 1, Dr. Homi Bhabha Road, Mumbai, 400005 India.