Paper: Three Knowledge-Free Methods for Automatic Lexical Chain Extraction

ACL ID N13-1119
Title Three Knowledge-Free Methods for Automatic Lexical Chain Extraction
Venue Annual Conference of the North American Chapter of the Association for Computational Linguistics
Session Main Conference
Year 2013
Authors

We present three approaches to lexical chain- ing based on the LDA topic model and eval- uate them intrinsically on a manually anno- tated set of German documents. After motivat- ing the choice of statistical methods for lexi- cal chaining with their adaptability to different languages and subject domains, we describe our new two-level chain annotation scheme, which rooted in the concept of cohesive har- mony. Also, we propose a new measure for direct evaluation of lexical chains. Our three LDA-based approaches outperform two knowledge-based state-of-the art methods to lexical chaining by a large margin, which can be attributed to lacking coverage of the knowl- edge resource. Subsequent analysis shows that the three methods yield a different chaining behavior, which could be utilized in ta...