(局外人).ppt

文档介绍：LearningtoEstimateQueryDifficultyIncludingApplicationstoMissingContentDetectionandDistributedInformationRetrievalEladYom-Tov,ShaiFine,DavidCarmel,-,includingimprovementofretrieval,detectingqueriesforwhichnorelevantcontentexistsinthedocumentcollection,(1/2)“difficult”,(2/2)Theobservationandmotivation::(局外人).ATRECqueryforexample:“Whatimpacthasthechunnel(水底隧道)hadontheBritisheconomyand/orthelifestyleoftheBritish”4RelatedWork(1/2)IntheRobusttrackofTREC2004,-:Measuringclaritybasedonthesystem’sscoreofthetopresultsAnalyzingtheambiguityofthequerytermsLearningapredictorusingoldTRECtopicsastrainingdata(Ounis,2004)showedthatIDF-basedpredictorispositivelyrelatedtoqueryprecision.(Diaz,2004)(2/2)ess(RIA)workshopinvestigatedthereasonsforsy