Funding for this research was provided by:
Innovative Research Groups of the National Natural Science Foundation of China (71421001)
National Natural Science Foundation of China (61502073)
National Natural Science Foundation of China (61429201)
Open Projects Program of National Laboratory of Pattern Recognition (201407349)
Army Research Office (Army Research Office)
Article History
Received: 3 May 2017
Accepted: 19 October 2017
First Online: 31 October 2017