Sprite: Generalizing Topic Models with Structured Priors Michael J Paul author Mark Dredze author 2015 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal paul-dredze-2015-sprite 10.1162/tacl_a_00121 https://aclanthology.org/Q15-1004/ 2015 3 43 57