Unsupervised lexicon acquisition for HPSG-based relation extraction

Authors:
Benjamin Rozenfeld;Ronen Feldman
Affiliations:
Digital Trowel and Hebrew University of Jerusalem, Israel;Digital Trowel and Hebrew University of Jerusalem, Israel
Venue:
IJCAI'11 Proceedings of the Twenty-Second international joint conference on Artificial Intelligence - Volume Volume Three
Year:
2011

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Abstract

The paper describes a method of relation extraction, which is based on parsing the input text using a combination of a generic HPSG-based grammar and a highly focused domain-and relation-specific lexicon. We also show a method of unsupervised acquisition of such a lexicon from a large unlabeled corpus. Together, the methods introduce a novel approach to the "Open IE" task, which is superior in accuracy and in quality of relation identification to the existing approaches.