Optimizing Language Model Information Retrieval System with Expectation Maximization Algorithm Justin Liang-Te Chiu author Jyun-Wei Huang author 2009-08 text Proceedings of the ACL-IJCNLP 2009 Student Research Workshop Brian Roark editor Grace Ngai editor Davis Muhajereen D Dimalen editor Jenny Rose Finkel editor Blaise Thomson editor Association for Computational Linguistics Suntec, Singapore conference publication chiu-huang-2009-optimizing https://aclanthology.org/P09-3008/ 2009-08 63 71