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页数:9页
时间:2019-07-29
《[NIPS 2012] Projection Retrieval for Classification》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、ProjectionRetrievalforClassificationMadalinaFiterauArturDubrawskiMachineLearningDepartmentSchoolofComputerScienceCarnegieMellonUniversityCarnegieMellonUniversityPittsburgh,PA15213Pittsburgh,PA15213mfiterau@cs.cmu.eduawd@cs.cmu.eduAbstractInmanyapplications,classificationsystemsoft
2、enrequirehumaninterventionintheloop.Insuchcasesthedecisionprocessmustbetransparentandcomprehen-sible,simultaneouslyrequiringminimalassumptionsontheunderlyingdatadis-tributions.Totacklethisproblem,weformulateanaxis-alignedsubspace-findingtaskundertheassumptionthatqueryspecificinfor
3、mationdictatesthecomple-mentaryuseofthesubspaces.Wedeveloparegression-basedapproachcalledRECIPthatefficientlysolvesthisproblembyfindingprojectionsthatminimizeanonparametricconditionalentropyestimator.Experimentsshowthatthemethodisaccurateinidentifyingtheinformativeprojectionsofthe
4、dataset,pickingthecorrectviewstoclassifyquerypoints,andfacilitatesvisualevaluationbyusers.1IntroductionandproblemstatementInthedomainofpredictiveanalytics,manyapplicationswhichkeephumanusersinthelooprequiretheuseofsimpleclassificationmodels.Often,itisrequiredthatatest-pointbe‘exp
5、lained’(classi-fied)usingasimplelow-dimensionalprojectionoftheoriginalfeaturespace.ThisisaProjectionRetrievalforClassificationproblem(PRC).Theinteractionwiththeuserproceedsasfollows:theuserprovidesthesystemaquerypoint;thesystemsearchesforaprojectioninwhichthepointcanbeaccuratelycl
6、assified;thesystemdisplaystheclassificationresultaswellasanillustrationofhowtheclassificationdecisionwasreachedintheselectedprojection.SolvingthePRCproblemisrelevantinmanypracticalapplications.Forinstance,consideranuclearthreatdetectionsysteminstalledatabordercheckpoint.Vehiclescro
7、ssingtheborderarescannedwithsensorssothatalargearrayofmeasurementsofradioactivityandsecondarycontextualinfor-mationisbeingcollected.Theseobservationsarefedintoaclassificationsystemthatdetermineswhetherthescannedvehiclemaycarryathreat.Giventhepotentiallydevastatingconsequencesofaf
8、alsenegative,abordercontrolagentisrequestedtova
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