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)
ARO grants (W911NF-15-1-0290)
Article History
Received: 14 May 2017
Revised: 15 November 2017
Accepted: 27 December 2017
First Online: 8 February 2018