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Báo cáo khoa học: "a Context-Aware Approach to Lexical Simplification"

We present a method for lexical simplification. Simplification rules are learned from a comparable corpus, and the rules are applied in a context-aware fashion to input sentences. Our method is unsupervised. Furthermore, it does not require any alignment or correspondence among the complex and simple corpora. We evaluate the simplification according to three criteria: preservation of grammaticality, preservation of meaning, and degree of simplification. | Putting it Simply a Context-Aware Approach to Lexical Simplification Or Biran Computer Science Columbia University New York NY 10027 ob2008@columbia.edu Samuel Brody Communication Information Rutgers University New BrUnswick NJ 08901 sdbrody@gmail.com n Noemie Elhadad Biomedical Informatics Columbia University New York NY 10032 ie@dbmi.columbia.edu Abstract We present a method for lexical simplification. Simplification rules are learned from a comparable corpus and the rules are applied in a context-aware fashion to input sentences. Our method is unsupervised. Furthermore it does not require any alignment or correspondence among the complex and simple corpora. We evaluate the simplification according to three criteria preservation of grammaticality preservation of meaning and degree of simplification. Results show that our method outperforms an established simplification baseline for both meaning preservation and simplification while maintaining a high level of grammaticality. 1 Introduction The task of simplification consists of editing an input text into a version that is less complex linguistically or more readable. Automated sentence simplification has been investigated mostly as a preprocessing step with the goal of improving NLP tasks such as parsing Chandrasekar et al. 1996 Siddharthan 2004 Jonnalagadda et al. 2009 semantic role labeling Vickrey and Koller 2008 and summarization Blake et al. 2007 . Automated simplification can also be considered as a way to help end users access relevant information which would be too complex to understand if left unedited. As such it was proposed as a tool for adults with aphasia Carroll et al. 1998 Devlin and Unthank 2006 hearing-impaired people Daelemans et al. 2004 readers with low-literacy skills Williams and Reiter 2005 individuals with intellectual disabilities Huenerfauth et al. 2009 as well as health 496 INPUT In 1900 Omaha was the center of a national uproar over the kidnapping of Edward Cudahy Jr. the son of a .