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1、OptimizingTaskAssignmentforCrowdsourcingEnvironmentsLuyiMoy,ReynoldChengy,XuanS.Yangy,ChenghuiReny,SiyuLeiy,EricLoz,BenKaoy,DavidW.CheungyyUniversityofHongKong,PokfulamRoad,HongKongzHongKongPolytechnicUniversity,HungHom,Kowloon,HongKongyflymo,ckcheng,xyang2,chren,syle
2、i,kao,dcheungg@cs.hku.hkzericlo@comp.polyu.edu.hkABSTRACTentityresolution[6,17,18],sortingandjoin[7,9],data l-tering[14],andimagetagging[19].Inacrowdsourcingsystem,HumanIntelligenceTasks(HIT-FortheseHITresultstobeuseful,theworkersinvolveds)(e.g.,sentencetranslation,ph
3、otomatching,providingneedtoperformwell.Inpractice,workerscouldbecasualkeywordsforvideos)canbeconvenientlyspeci ed.TheseInternetusersandtheirresultsarehardlyperfect[3,6{8];HITsareavailabletoalargepoolofworkers,whoarepaidtheymaymakecarelessmistakes,ormisinterprettheHITu
4、poncompletingtheirselectedHITs.Sincetheseworkersrequirements.Moreover,aHITresultmayonlydescribemayhavedi erentcapabilities,somedicultHITsmaynotsomeofthemanyaspectsofthetrueanswer.ConsideraHITbesatisfactorilyperformed.Ifmoreworkersareemployedtothatinquires:WhatistheU
5、RLhttp://earth.google.performtheseHITs,theirresultqualitycouldbestatisticallycom/(GoogleEarthhomepage)about?"Aworkermaygiveimproved.Inthispaper,weaddresstheimportantproblemananswermap,navigation",anotherworkermaysaythatofdecidingthenumberofworkers(orplurality)foragiv
6、enitisaboutscenery,photos",whileathirdonemaygiveansetofHITs.Weproposeatheoreticallyoptimalalgorithmanswerweather".Thus,asingleresultmaynotcaptureallgivena xedbudget"(i.e.,theamountofmoneypaidforaspectsofananswer.performingHITs).Thissolutiondeterminesthebestplural-T
7、ocombattheaboveproblems,arequesterissuggestedityofeachHIT.WealsoobservethatforaHITthatinvolvestoassignasucientnumberofworkerstoaHIT[2,3,6{8].multiple-choicequestions,itsqualityincreasesmonotonical-InAMT,forinstance,arequesterisaskedtospecifythelywiththenumberofworker
8、s,albeitinadecreasingrate.pluralityofaHITi.e.,thenumberofworkersrequiredtoThisleadsustodevelopanecientgreedyalgorithmwithpe
