Efficient question answering with question decomposition and multiple answer streams
Hartrumpf, Sven and Glöckner, Ingo and Leveling, Johannes (2009) Efficient question answering with question decomposition and multiple answer streams. In: CLEF 2009, 30 Sept - 2 Oct. 2009, Corfu, Greece.
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The German question answering (QA) system IRSAW (formerly:
InSicht) participated in QA@CLEF for the fth time. IRSAW
was introduced in 2007 by integrating the deep answer producer InSicht, several shallow answer producers, and a logical validator. InSicht builds on a deep QA approach: it transforms documents to semantic representations using a parser, draws inferences on semantic representations with
rules, and matches semantic representations derived from questions and documents. InSicht was improved for QA@CLEF 2008 mainly in the following two areas. The coreference resolver was trained on question series instead of newspaper texts in order to be better applicable for follow-up questions. Questions are decomposed by several methods on the level of semantic representations. On the shallow processing side, the number of answer producers was increased from two to four by adding FACT, a fact index, and SHASE, a shallow semantic network matcher. The answer
validator introduced in 2007 was replaced by the faster RAVE validator designed for logic-based answer validation under time constraints. Using RAVE for merging the results of the answer producers, monolingual German runs and bilingual runs with source language English and Spanish were produced by applying the machine translation web service Promt. An error analysis shows the main problems for the precision-oriented
deep answer producer InSicht and the potential offered by the recall-oriented shallow answer producers.
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