Gradiant-Analytics: Training Polarity Shifters with CRFs for Message Level Polarity Detection Héctor Cerezo-Costas author Diego Celix-Salgado author 2015-06 text Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015) Preslav Nakov editor Torsten Zesch editor Daniel Cer editor David Jurgens editor Association for Computational Linguistics Denver, Colorado conference publication cerezo-costas-celix-salgado-2015-gradiant 10.18653/v1/S15-2090 https://aclanthology.org/S15-2090/ 2015-06 539 544