Building Semantic Perceptron Net for Topic Spotting Jimin Liu author Tat-Seng Chua author 2001-07 text Proceedings of the 39th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Toulouse, France conference publication liu-chua-2001-building 10.3115/1073012.1073061 https://aclanthology.org/P01-1049/ 2001-07 378 385