Stochastic Language Generation in Dialogue using Factored Language Models François Mairesse author Steve Young author 2014-12 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal mairesse-young-2014-stochastic 10.1162/COLI_a_00199 https://aclanthology.org/J14-4003/ 2014-12 40 4 763 799