Topic Modeling in Embedding Spaces Adji B Dieng author Francisco J R Ruiz author David M Blei author 2020 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal dieng-etal-2020-topic 10.1162/tacl_a_00325 https://aclanthology.org/2020.tacl-1.29/ 2020 8 439 453