OpenFact: Factuality Enhanced Open Knowledge Extraction Linfeng Song author Ante Wang author Xiaoman Pan author Hongming Zhang author Dian Yu author Lifeng Jin author Haitao Mi author Jinsong Su author Yue Zhang author Dong Yu author 2023 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal song-etal-2023-openfact 10.1162/tacl_a_00569 https://aclanthology.org/2023.tacl-1.40/ 2023 11 686 702