The authors thank Chaochao Yan (Google), Xin Miao (Amazon), Xiantong Zhen (United Image), and Andy Wang (Apple) for helping set up GPU facilities and their suggestions. The paper benefits from the discussions with Jennifer Zhang (University of Texas at Arlington) and Jeff Hou (National Cheng Kung University). Kay-Yut Chen has a potential research conflict of interest because of a financial interest with companies Hewlett-Packard Enterprise, Boostr, and DecisionNext. A management plan has been created to preserve objectivity in research in accordance with the policy of The University of Texas at Arlington.
