1. Anhui Province Key Laboratory of Affective Computing and Advanced Intelligence Machine and School of Computer and Information, Hefei University of Technology, Hefei, China
2. CAS Key Laboratory of Electromagnetic Space Information, University of Science and Technology of China, Hefei, China
3. Department of Computer Science, Iowa State University, Iowa, America
4. School of Computer Science and Technology, University of Science and Technology of China, Hefei, China
5. School of Electrical and Computer Engineering, Purdue University, Indiana, America
6. Department of Computer and Network Engineering, The University of Electro-Communications, Tokyo, Japan