Download e-book for iPad: Advances in Open Domain Question Answering (Text, Speech and by Tomek Strzalkowski, Sanda Harabagiu

By Tomek Strzalkowski, Sanda Harabagiu

This new Springer quantity offers a accomplished and designated examine present techniques to automatic query answering. the extent of presentation is appropriate for novices to the sector in addition to for execs wishing to check this sector and/or to construct useful QA platforms. The ebook can function a "how-to" instruction manual for IT practitioners and process builders. it will probably even be used to coach graduate classes in computing device technological know-how, details technological know-how and comparable disciplines.

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Brin, S. and Page, L. (1998). The anatomy of large scale hypertextual Web search engine. In 7th International World Wide Web Conference, Brisbane, Australia. Fellbaum, C. (1998). WordNet: An Electronic Lexical Database and Some of its Applications. MIT Press. , Appelt, D. and Martin, P. (1993). Interpretation as abduction. Artificial Intelligence, 63: 69-142. Jansen, B. (2000). The effect of query complexity on Web searching results. Information Research, 6(1), October. Y. (2002) . The effectiveness of dictionary and web-based answer reranking.

To this effect, the parse tree of the whole sentence is processed to derive the phrase that gives the exact answer. The exact answer is selected from the enclosing phrase around the question phrase to search. In turn, the enclosing phrase is determined by iteratively selecting the parent of the current node in the parse tree as long as the parent is a noun phrase. The resulting noun phrase is post-processed to remove the question phrase, as well as the stop words (determiners, pronouns) from the extremities.

Performance over TREC Definition questions. ) respectively. 17 Exact answers (Min). 23 To assess the ability of the QA system to extract minimal answers (a task much harder than the extraction of relevant sentences), we also evaluated the returned answers manually. Each answer was marked as correct if it matched a TREC answer key and it was minimal. The scores are shown in the last two rows of Table 6. 2) were disabled and a more relaxed approximation of exact answers was used instead. The approximation consists of estimating the position of the exact answer from the pattern matches without parsing the answer sentences.

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