Unsupervised information extraction from unstructured, ungrammatical data sources on the World Wide Web

Authors:
Matthew Michelson;Craig A. Knoblock
Affiliations:
University of Southern California, Information Sciences Institute, Marina del Rey, CA, USA;University of Southern California, Information Sciences Institute, Marina del Rey, CA, USA
Venue:
International Journal on Document Analysis and Recognition
Year:
2007

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Abstract

Information extraction from unstructured, ungrammatical data such as classified listings is difficult because traditional structural and grammatical extraction methods do not apply. Previous work has exploited reference sets to aid such extraction, but it did so using supervised machine learning. In this paper, we present an unsupervised approach that both selects the relevant reference set(s) automatically and then uses it for unsupervised extraction. We validate our approach with experimental results that show our unsupervised extraction is competitive with supervised machine learning approaches, including the previous supervised approach that exploits reference sets.