1. Business Analysis CenterOsaka Gas Co., Ltd. Chuo‐ku, Osaka Japan
2. Faculty of Data ScienceShiga University Hikone Japan
3. NTT DATA Mathematical Systems Inc. Shinjuku‐ku, Tokyo Japan
4. ABEJA, Inc. Minato‐ku, Tokyo Japan
5. OMRON Corporation Kizugawadai, Kizugawa Japan