[Lin, Haifeng] Nanjing Forestry Univ, Coll Informat Sci & Technol, Nanjing 210037, Peoples R China.
[Han, Yehong] Qilu Normal Univ, Coll Informat Sci & Engn, Jinan 250200, Peoples R China.
[Cai, Weiwei] Cent South Univ Forestry & Technol, Sch Logist & Transportat, Changsha 410004, Peoples R China.
[Cai, Weiwei] AiTech Artificial Intelligence Res Inst, Changsha 410000, Peoples R China.
[Jin, Bo] Univ Coimbra, Dept Elect & Comp Engn, P-3030290 Coimbra, Portugal.