[Tang, Cheng; Tang, Zheng] Univ Toyama, Fac Engn, Toyama 9308555, Japan.
[Song, Shuangbao] Changzhou Univ, Aliyun Sch Big Data, Changzhou 213164, Jiangsu, Peoples R China.
[Ji, Junkai] Shenzhen Univ, Coll Comp Sci & Software Engn, Shenzhen 518060, Peoples R China.
[Tang, Yajiao] Cent South Univ Forestry & Technol, Coll Econ, Changsha 410004, Peoples R China.
[Todo, Yuki] Kanazawa Univ, Fac Elect & Comp Engn, Kanazawa, Ishikawa 9201192, Japan.