title: Labeling emotions in suicide notes: cost-sensitive learning with heterogeneous features.
abstract: This paper describes a system developed for Track 2 of the 2011 Medical NLP Challenge on identifying emotions in suicide notes. Our approach involves learning a collection of one-versus-all classifiers, each deciding whether or not a particular label should be assigned to a given sentence. We explore a variety of features types-syntactic, semantic and surface-oriented. Cost-sensitive learning is used for dealing with the issue of class imbalance in the data.
authors.affiliation: Department of Informatics, University of Oslo, Norway.
authors.forename: Jonathon
authors.initials: J
authors.lastname: Read
authors.forename: Erik
authors.initials: E
authors.lastname: Velldal
authors.forename: Lilja
authors.initials: L
authors.lastname: Ovrelid