1. Department of Automation, Ministry of Education Key Laboratory of Bioinformatics, Bioinformatics Division, Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing, China
2. School of Computer Science and Engineering, Fuyao Institute of Technology, Fuzhou, China
3. Institute of Geographic Sciences and Natural Resources Research, State Key Laboratory of Resources and Environmental Information Systems, Chinese Academy of Sciences, Beijing, China
4. Department of Computer Science and Engineering, Southern University of Science and Technology, Shenzhen, China