Feature-Frequency–Adaptive On-line Training for Fast and Accurate Natural Language Processing Xu Sun author Wenjie Li author Houfeng Wang author Qin Lu author 2014-09 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal sun-etal-2014-feature 10.1162/COLI_a_00193 https://aclanthology.org/J14-3004/ 2014-09 40 3 563 586