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EQUAL Encyclopaedic QA for Lists Iustin Dornescu Research Group in - PowerPoint PPT Presentation

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Semantic QA: my vision for the future EQUAL Implementation details EQUAL Encyclopaedic QA for Lists Iustin Dornescu Research Group in Computational Linguistics, University of Wolverhampton, UK October 2, 2009 Iustin Dornescu CLEF

  1. Semantic QA: my vision for the future EQUAL – Implementation details EQUAL – Encyclopaedic QA for Lists Iustin Dornescu Research Group in Computational Linguistics, University of Wolverhampton, UK October 2, 2009 Iustin Dornescu CLEF 2009 Workshop

  2. Semantic QA: my vision for the future EQUAL – Implementation details GikiCLEF Complex question answering on Wikipedia. 50 multilingual list topics such as: GC-2009-06 Which Dutch violinists held the post of concertmaster at the Royal Concertgebouw Orchestra in the twentieth century? GC-2009-34 What eight-thousanders are at least partially in Nepal? Iustin Dornescu CLEF 2009 Workshop

  3. Semantic QA: my vision for the future EQUAL – Implementation details Encouraging results We need something radically different to standard textual QA Iustin Dornescu CLEF 2009 Workshop

  4. Semantic QA: my vision for the future EQUAL – Implementation details Outline Semantic QA: my vision for the future 1 EQUAL – Implementation details 2 Iustin Dornescu CLEF 2009 Workshop

  5. Semantic QA: my vision for the future EQUAL – Implementation details Semantic QA rEvolution Textual QA [web of] documents vs. web of data document retrieval vs. search for facts keywords & co-occurrence vs. concepts & relations textual snippet vs. graph patterns gazetteers vs. RDF Data text with entities vs. entities with text lexical semantics vs. formal semantics Semantic QA Iustin Dornescu CLEF 2009 Workshop

  6. Semantic QA: my vision for the future EQUAL – Implementation details Semantic QA representation represent Wikipedia using a semantic graph: entities characterised by types, attributes & properties, and connected to each other by relations a question is a composition of constraints about: entities their types their properties their relations finding answers means performing some actions from a given set (that the system understands) Iustin Dornescu CLEF 2009 Workshop

  7. Semantic QA: my vision for the future EQUAL – Implementation details Semantic QA Dev. topic Which football players from Brazil play in clubs from the Iberian Peninsula 1. identify Brazilian footballers 2. identify the club each of them plays for 3. test if the club is located in the Iberian Peninsula Iustin Dornescu CLEF 2009 Workshop

  8. Semantic QA: my vision for the future EQUAL – Implementation details Semantic QA Iustin Dornescu CLEF 2009 Workshop

  9. Semantic QA: my vision for the future EQUAL – Implementation details Analysis and Feedback A useful QA system must use the meaning, not the words: Analysis Phase Understand the information need behind the question detect different ambiguity sources create a semantic question interpretation for each ranking Feedback Phase Interact with the user allow user to disambiguate generate justification active learning Iustin Dornescu CLEF 2009 Workshop

  10. Semantic QA: my vision for the future EQUAL – Implementation details Outline Semantic QA: my vision for the future 1 EQUAL – Implementation details 2 Iustin Dornescu CLEF 2009 Workshop

  11. Semantic QA: my vision for the future EQUAL – Implementation details Analysis 1: EAT a) Use an ad-hoc classifier for chunk delimiters: the first chunk with a plural noun contains the EAT; List the Italian places where ... Which countries have... Name Romanian poets who... Which Dutch violinists who... In which European countries is... b) Find the best matching Wikipedia Category. Iustin Dornescu CLEF 2009 Workshop

  12. Semantic QA: my vision for the future EQUAL – Implementation details Analysis 2: Constraints Map the remaining chunks to semantic constraints: a) entity: ..“are at least partly in [[Nepal]]” b) category: ..“play in [[Spanish football clubs]]” c) property: ..“with a population larger than 100,000 people ” d) temporal: ..“in the twentieth century” e) geographic: ..“are at least partly in [[Nepal]]” Iustin Dornescu CLEF 2009 Workshop

  13. Semantic QA: my vision for the future EQUAL – Implementation details Analysis 3: Filters The actual implementation of a semantic constraint. infobox attributes categories definition external datasources article text (NLP) Iustin Dornescu CLEF 2009 Workshop

  14. Semantic QA: my vision for the future EQUAL – Implementation details Results EQUAL: 813 answers – 385(correct), 105(unjustified), 323(incorrect) P = 47 . 35 % ( 60 . 27 % ) R p = 27 . 20 % ( 34 . 62 % ) Total Answers: 1415 Iustin Dornescu CLEF 2009 Workshop

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