School of Information Science, Japan Advanced Institute of Science and Technology, Ishikawa, Japan. nthnhung@jaist.ac.jp.|Toyota Technological Institute, Nagoya, Japan. makoto-miwa@toyota-ti.ac.jp.|Graduate School of Engineering, The University of Tokyo, Tokyo, Japan. tsuruoka@logos.t.u-tokyo.ac.jp.|Graduate School of Engineering, The University of Tokyo, Tokyo, Japan. chikayama@logos.t.u-tokyo.ac.jp.|School of Information Science, Japan Advanced Institute of Science and Technology, Ishikawa, Japan. tojo@jaist.ac.jp.