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1、MechanicalCheat:SpammingSchemesandAdversarialTechniquesonCrowdsourcingPlatformsDjellelEddineDifallah,GianlucaDemartini,andPhilippeCudré-MaurouxeXascaleInfolabU.ofFribourg—Switzerland{firstname.lastname}@unifr.chABSTRACTincludeimageannotation,relevancejudgement,sentimentanalysis,language
2、translation,etc.Currently,crowdsouc-Crowdsourcingisbecomingavaluablemethodforcompanies1ingplatformslikeAmazonMechanicalTurk(AMT)allowandresearcherstocompletescoresofmicro-tasksbymeansrequesterstocreatetasksintheformofwebpages,decideofopencallsondedicatedonlineplatforms.Crowdsourcingonh
3、owmuchtopaypertask,andrestrictparticipantsbyresultsremainsunreliable,however,asthoseplatformsnei-declaring ltersonacceptancerate,country,etc.Oncethetherconveymuchinformationabouttheworkers'identitytasksarecompleted,therequestergetsbackresultsinthenordotheyensurethequalityoftheworkdone.
4、Instead,itformofraw lesfromwhichtheyaresupposedto lteroutistheresponsibilityoftherequesterto lteroutbadworkers,badanswers,anddecidewhetherornottopayforeachpoorlyaccomplishedtasks,andtoaggregateworkerresultsgivenanswer.Oneparticularappealofcrowdsourcingistoinordertoobtaina naloutcome.In
5、thispaper,we rstre-completelargecollectionsoftasksthatarequestercannotviewtechniquescurrentlyusedtodetectspammersandma-dobyhimselfinareasonableamountoftime;hence,goingliciousworkers,whethertheyarebotsorhumansrandomlythroughalltheresponsemanuallyisalsonotpractical.orsemi-randomlycomplet
6、ingtasks;then,wedescribetheCrowdsourcingcallsattractsdi erentcategoriesofpoten-limitationsofexistingtechniquesbyproposingapproachestialworkers;astudyofthedemographicsshowedthatwork-thatindividuals,orgroupsofindividuals,couldusetoat-ersarespreadovercountryclusters(mostlyinIndiaandtackat
7、askonexistingcrowdsourcingplatforms.WefocusUSA),ageandoccupation.Theincentivesforcompletingoncrowdsourcingrelevancejudgementsforsearchresultsasataskvariespertasktypeandperindividuals.Formoreaconcreteapplicationofourtechniques.than50%oftheIndianworkers,forinstance,crowdsourcing2isapri
