Mainak Jas Devi Parikh 2727-2736 2015 CVPR https://doi.org/10.1109/CVPR.2015.7298889 https://doi.ieeecomputersociety.org/10.1109/CVPR.2015.7298889 conf/cvpr/2015 db/conf/cvpr/cvpr2015.html#JasP15