Reducing Annotation Effort on Unbalanced Corpus based on Cost Matrix Wencan Luo author Diane Litman author Joel Chan author 2013-06 text Proceedings of the 2013 NAACL HLT Student Research Workshop Annie Louis editor Richard Socher editor Julia Hockenmaier editor Eric K Ringger editor Association for Computational Linguistics Atlanta, Georgia conference publication luo-etal-2013-reducing https://aclanthology.org/N13-2002/ 2013-06 8 15