1. Cognitive Group, 1155 René Lévesque West, Suite 2500, Montreal, QC, Canada, H3B 2K4
2. École Polytechnique de Montréal, Department of Mathematics and Industrial Engineering, P.O. 6079, St. Centre-Ville, Montréal, QC, Canada, H3C 3A7
3. University of Oxford, Mathematical Institute, 24–29 St Giles’, Oxford, OX1 3LB, UK