Clustering-Based Stratified Seed Sampling for Semi-Supervised Relation Classification Longhua Qian author Guodong Zhou author 2010-10 text Proceedings of the 2010 Conference on Empirical Methods in Natural Language Processing Hang Li editor Lluís Màrquez editor Association for Computational Linguistics Cambridge, MA conference publication qian-zhou-2010-clustering https://aclanthology.org/D10-1034/ 2010-10 346 355