Mine the Easy, Classify the Hard: A Semi-Supervised Approach to Automatic Sentiment Classification Sajib Dasgupta author Vincent Ng author 2009-08 text Proceedings of the Joint Conference of the 47th Annual Meeting of the ACL and the 4th International Joint Conference on Natural Language Processing of the AFNLP Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication dasgupta-ng-2009-mine https://aclanthology.org/P09-1079/ 2009-08 701 709