1. School of Computer Science and Engineering, South China University of Technology, Guangzhou, China.
2. Department of New Network Technologies, Peng Cheng Laboratory, Shenzhen, China.
3. School of Computing, Guangdong Neusoft Institute, Foshan, China.
4. School of Software Engineering, South China University of Technology, Guangzhou, China.
5. School of Information Science and Technology, Beijing Forestry University, Beijing, China.
6. Engineering Research Center for Forestry-Oriented Intelligent Information Processing of National Forestry and Grassland Administration, Beijing, China.