Thumbs Up or Thumbs Down? Semantic Orientation Applied to Unsupervised Classification of Reviews Peter Turney author 2002-07 text Proceedings of the 40th Annual Meeting of the Association for Computational Linguistics Pierre Isabelle editor Eugene Charniak editor Dekang Lin editor Association for Computational Linguistics Philadelphia, Pennsylvania, USA conference publication turney-2002-thumbs 10.3115/1073083.1073153 https://aclanthology.org/P02-1053/ 2002-07 417 424