Enhance Top-down method with Meta-Classification for Very Large-scale Hierarchical Classification Xiao-Lin Wang author Hai Zhao author Bao-Liang Lu 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 wang-etal-2011-enhance https://aclanthology.org/I11-1122/ 2011-11 1089 1097