1 Department of Computer Science, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan. sato.y.cf@m.titech.ac.jp.
2 Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, 305-8566, Japan. morita.m9@aist.go.jp.
3 Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-Aza Aoba, Aoba-ku, Sendai, 980-8578, Japan. ysuzuki79r@molbot.mech.tohoku.ac.jp.