Information Retrieval based on Paraphrase

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1、InformationRetrievalbasedonParaphrasePeterWallisDept.ofComputerScience,RMIT,Melbourne,Australia,(peter@cs.rmit.edu.au)TextRetrievalsystemsbasedonrankingusesim-2InformationRetrievalilarityasanapproximationtorelevance.Mostofthesesystemsignorewordmeaning.Weas-Examplesofinforma

2、tionretrieval(IR),ortextretrievalsumethatsomemeasureofparaphrasewouldsystemscanbefoundatmostlibrariesintheformofon-beabettersimilaritymeasure.Wedevelopalinecatalogsandcitationindexes.SuchsystemsusuallyconceptofparaphrasebasedonMeaning-Textmaketheirkey-wordbasednatureexplici

3、tbyaskingforTheoryandimplementanapproximationtothesomebooleancombinationoftermswhichmustappearinidealusingtheLongmanDictionaryofContem-atitleorsubject®eld.MorerecentdevelopmentsallowporaryEnglish(LDOCE).Theperformanceoftheusertoentersearchtermsintheformofanaturallan-thenews

4、ystemisassessedusingrecallandpre-guagequery.Forexampleausercouldmakethefollowingcisionaveragesontwostandardcollections.Werequest:discusstheresultsandconcludethatwecouldªI'minterestedincommunicationbetweendis-improveperformanceifonlytherestrictedvo-jointprocesses.ºcabularyof

5、thedictionaryentrieshadapartic-ularproperty.WethenproposeatechniqueforThesesystemsextractkeywordsfromthequeryandthenmodifyingtheentriesusingstatisticalmethods®nddocumentswhichcontainasigni®cantproportionofrecentlyusedininformationretrieval.theextractedwords.Forinstancethefo

6、llowingsetmightbeextractedfromtheabovequery:Key-words:LexicalSemantics,paraphrase,Informa-(ªinterestºªcommunicationºªbetweenºªdis-tionRetrieval,Meaning-TextTheory,semanticprimitives,jointºªprocessesº)LDOCEThedocumentsarealsotreatedassetsofterms,andrankedagainstthequeryusing

7、asimilaritymeasure.Thedocu-mentsareshowntotheuserbest®rst.Theuserlooks1Introductionthroughtherankedlistuntilthey®ndwhattheywant,ordecidetotryadifferentquery.Themosteffectivesim-Generalpurposequestion-answeringisanon-trivialtaskilaritymeasurestodatetreatdocumentsandqueriesas

8、beyondthereachofcurrentcomputerscience,buttextcollectionsofindependentfeatures.The