1. Institute of Machine Learning and Systems Biology, School of Electronics and Information Engineering, Tongji University, Shanghai 201804, China
2. School of Information and Computer, Anhui Agricultural University, Changjiang West Road 130, Hefei, Anhui, China
3. Department of Computer Science and Engineering, Inha University, Incheon, Republic of Korea
4. Department of Electronic and Computer Engineering, Brunel University London, Uxbridge UB8 3PH, UK
5. Center for Computational Biology and Bioinformatics, Columbia University, 1130 St. Nicholas Avenue, Room 815, New York, NY 10032, USA