Associate Professor,
Mathematical Informatics 4th Laboratory,
Department of Mathematical Informatics,
Graduate School of Information Science and Technology,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
E-mail: matsuda [at] mist.i.u-tokyo.ac.jp
Unit Leader,
Statistical Mathematics Unit,
RIKEN Center for Brain Science,
2-1 Hirosawa Wako City, Saitama 351-0198, Japan
E-mail: takeru.matsuda [at] riken.jp