1. Gatsby Unit of Computational Neuroscience, London W1T 4JG, U.K. xwk4813@gmail.com
2. RIKEN Center for Advanced Intelligence Report, Tokyo 103-0027, Japan gang.niu@riken.jp
3. Université Paris-Saclay, Inria, CEA, Paris 91120, France, and University of Helsinki, FIN00560 Helsinki, Finland aapo.hyvarinen@helsinki.fi
4. RIKEN, Center for Advanced Intelligence Report, Tokyo 103-0027, Japan, and University of Tokyo, Tokyo 113-0033, Japan sugi@k.u-tokyo.ac.jp