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Contradictions and Justifications: Extensions to the Textual Entailment Task

Published

Author(s)

Ellen M. Voorhees

Abstract

The third PASCAL Recognizing Textual Entailment Challenge (RTE-3) contained an optional task that extended the main entailment task by requiring a system to make three-way entailment decisions (entails, contradicts, neither) and to justify its response.  Contradiction was rare in the RTE-3 test set, occurring in only about 10% of the cases, and systems found accurately detecting it difficult.  Subsequent analysis of the results shows a test set must contain many more entailment pairs for the three-way task than the traditional two-way task to have equal confidence in system comparisons.  Each of six human judges representing eventual end users rated the quality of a justification by assigning "understandability" and "correctness" scores.  Ratings of the same justification across judges differed significantly, signaling the need for a better characterization of the justification task.
Proceedings Title
Proceedings of the 46th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies (ACL 2008)
Conference Dates
June 15-20, 2008
Conference Location
Columbus, OH
Conference Title
46th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies (ACL 2008)

Keywords

natural language processing, textual entailment
Created June 16, 2008, Updated February 19, 2017