A Fast Accurate Two-stage Training Algorithm for L1-regularized CRFs with Heuristic Line Search Strategy Jinlong Zhou author Xipeng Qiu author Xuanjing Huang author 2011-11 text Proceedings of 5th International Joint Conference on Natural Language Processing Haifeng Wang editor David Yarowsky editor Asian Federation of Natural Language Processing Chiang Mai, Thailand conference publication zhou-etal-2011-fast https://aclanthology.org/I11-1008/ 2011-11 65 74