1. Department of Advanced Information Technology, Faculty of Information Science and Electrical Engineering, Kyushu University, and RIKEN Center for Advanced Intelligence Project, Nishi-ku, Fukuoka, 8190395, Japan
2. Faculty of Arts and Science, Kyushu University, and RIKEN Center for Advanced Intelligence Project, Nishi-ku, Fukuoka, 8190395, Japan
3. Department of Informatics, Faculty of Information Science and Electrical Engineering, Kyushu University, Nishi-ku, Fukuoka, 8190395, Japan
4. Department of Mathematics, Keio University, and RIKEN Center for Advanced Intelligence Project, Minatokita-ku, Yokohama, 2238522, Japan
5. Department of Creative Informatics, University of Tokyo, and RIKEN Center for Advanced Intelligence Project, Bunkyo-ku, Tokyo, 1138656, Japan