. Author manuscript; available in PMC: 2019 Oct 8.
Published in final edited form as: Neurocomputing (Amst). 2019 Feb 7;335:34–45. doi: 10.1016/j.neucom.2019.01.103
This is an open access article under the CC BY license. (http://creativecommons.org/licenses/by/4.0/)