1. Graduate School of Science and Technology, Tokyo University of Science, Chiba, Japan
2. Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo, Japan
3. Faculty of Sport and Health Science, Ritsumeikan University, Shiga, Japan
4. Department of Systems and Control Engineering, Tokyo Institute of Technology, Tokyo, Japan
5. Prosthetics and Orthotics Support Center, Tetsudou Kousaikai Foundation, Tokyo, Japan