Automatic Cost Estimation for Tree Edit Distance Using Particle Swarm Optimization Yashar Mehdad author 2009-08 text Proceedings of the ACL-IJCNLP 2009 Conference Short Papers Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication mehdad-2009-automatic https://aclanthology.org/P09-2073/ 2009-08 289 292