Discrete-State Variational Autoencoders for Joint Discovery and Factorization of Relations Diego Marcheggiani author Ivan Titov author 2016 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal marcheggiani-titov-2016-discrete 10.1162/tacl_a_00095 https://aclanthology.org/Q16-1017/ 2016 4 231 244