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AI-ComplexAlgorithmsandeffectiveDataProtectionSupervision

Effectiveimplementationofdatasubjects’rights

byDr.KrisSHRISHAK

AI-ComplexAlgorithmsandeffectiveDataProtectionSupervision-Effectiveimplementationofdatasubjects’rights

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AspartoftheSPEprogramme,theEDPBmaycommissioncontractorstoprovidereportsandtoolsonspecifictopics.

TheviewsexpressedinthedeliverablesarethoseoftheirauthorsandtheydonotnecessarilyreflecttheofficialpositionoftheEDPB.TheEDPBdoesnotguaranteetheaccuracyoftheinformationincludedinthedeliverables.NeithertheEDPBnoranypersonactingontheEDPB’sbehalfmaybeheldresponsibleforanyusethatmaybemadeoftheinformationcontainedinthedeliverables.

Someexcerptsmayberedactedorremovedfromthedeliverablesastheirpublicationwouldunderminetheprotectionoflegitimateinterests,including,interalia,theprivacyandintegrityofanindividualregardingtheprotectionofpersonaldatainaccordancewithRegulation(EU)2018/1725and/orthecommercialinterestsofanaturalorlegalperson.

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TABLEOFCONTENTS

Introduction 4

1Challenges 4

2Howtodeleteandunlearn 5

3Whattounlearn 7

4Approximateunlearningverification 8

5ConcernswithMachineUnlearning 8

6LimitingpersonaldataoutputfromgenerativeAI 9

Conclusion 10

Bibliography 11

DocumentsubmittedinMarch2024

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INTRODUCTION

TheGeneraldataProtectionRegulation(GDPR)empowersdatasubjectsthrougharangeofrights.Adatasubjecthastherighttoinformation(Articles12-14),therightofaccess(Article15),therighttorectification(Article16),therighttoerasure(Article17),therighttorestrictprocessing(Article18),therighttodataportability(Article20),therighttoobject(Article21)andtherightnottobesubjecttoadecisionbasedsolelyonautomatedprocessing(Article22).

Thisreportcoverstechniquesandmethodsthatcanbeusedforeffectiveimplementationofdatasubjectrights,specifically,therightstorectificationandtherighttoerasurewhenAIsystemshavebeendevelopedwithpersonaldata.Thisreportaddressestheserightstogetherbecauserectificationinvolveserasurefollowedbytheinclusionofnewdata.Thesetechniquesandmethodsaretheresultofearly-stageresearchbytheacademiccommunity.Improvementsandalternativeapproachesareexpectedtobedevelopedinthecomingyears.

1CHALLENGES

AIsystemsaretrainedondatathatisoftenmemorisedbythemodels(Carlinietal.,2021).Machinelearningmodelsbehavelikelossycompressorsoftrainingdataandtheperformanceofthesemodelsbasedondeeplearningisfurtherattributedtothisbehaviour(Schelter,2020;Tishby&Zaslavsky,2015).Inotherwords,machinelearningmodelsarecompressedversionsofthetrainingdata.Additionally,AImodelsarealsosusceptibletomembershipinferenceattacksthathelptoassesswhetherdataaboutapersonisinthetrainingdataset(Shokrietal.,2017).Thus,implementingtherighttoerasureandrectificationrequiresreversingthememorisationofpersonaldatabythemodel.Thisinvolvesdeletionof(1)thepersonaldatausedasinputfortraining,and(2)theinfluenceofthespecificdatapointsinthetrainedmodel.

Thereareseveralchallengestoeffectivelyimplementtheserights(Bourtouleetal.,2021):

1.Limitedunderstandingofhoweachdatapointimpactsthemodel:Thischallengeisparticularlyprevalentwiththeuseofdeepneuralnetworks.Itisnotknownhowspecificinputdatapointsimpacttheparametersofamodel.Thebestknownmethodsrelyon“influencefunctions”involvingexpensiveestimations(bycomputingsecond-orderderivativesofthetrainingalgorithm)(Cook&Weisberg,1980;Koh&Liang,2017).

2.Stochasticityoftraining:TrainingAImodelsisusuallyperformedbyrandomsamplingofbatchesofdatafromthedataset,randomorderingofthebatchesinhowandwhentheyareprocessed,andparallelisationwithouttime-synchronisation.Allthesemakethetrainingprocessprobabilistic.Asaresult,amodeltrainedwiththesamealgorithmanddatasetcouldresultindifferenttrainedmodels(Jagielskietal.,2023).

3.Incrementaltrainingprocess:Modelsaretrainedincrementallysuchthatanupdaterelyingonspecifictrainingdatapointwillaffectallsubsequentupdates.Inotherwords,updatesinthetrainingprocessdependonallpreviousupdates.Inthedistributedtrainingsettingoffederatedlearning,multipleclientskeeptheirdataandtrainamodellocallybeforesendingtheupdatestoacentralserver.Insuchasetting,evenwhenaclientonlyoncesendsitsupdateandcontributestotheglobalmodelatthecentralserver,thedataandthecontributionofthisclientinfluencesallfutureupdatestotheglobalmodel.

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4.Stochasticityoflearning:Inadditiontothetrainingprocess,thelearningalgorithmisalsoprobabilistic.Thechoiceoftheoptimiser,forexample,forneuralnetworkscanresultinmanydifferentlocalminima(resultoftheoptimisation).Thismakesitdifficulttocorrelatehowaspecificdatapointcontributedtothe“l(fā)earning”inthemodel.

2HOWTODELETEANDUNLEARN

1.DataCurationandProvenance:EssentialelementstoimplementtherightsinArticles15-17ofGDPRaredatacurationandprovenance.However,thesearenecessarybutnotsufficientforimplementingtheserightscompletelyastheydonotincludeinformationrelatedtohowthedatainfluencedthetrainedmodel.Theseareprerequisitesfortheotherapproachesinthisreport.

2.Retrainingofmodels:Deletingthemodel,removingthepersonaldatarequestedtobeerased,andthenretrainingthemodelwiththerestofthedataisthemethodthatimplementstherightsinArticles16-17oftheGDPReffectively.Forsmallmodels,thismethodworkswell.However,forlargermodels,thetrainingcostisveryexpensiveandoftenalternativeapproachesmightberequired,especiallywhennumerousdeletionrequestsareexpected.Furthermore,thisapproach,andmanyoftheotherapproaches,assumesthatthemodeldeveloperisinpossessionofthetrainingdatasetswhentherequirementtodeleteandretrainarises.

3.Exactunlearning:Toavoidretrainingtheentiremodel,approachestounlearnthedatahavebeenproposed.Despitethegrowingliterature,thereareveryfewunlearningmethodsthatarecurrentlymostlikelytobeeffective.

a.Modelagnosticunlearning:Thismethodisnotdependentonthespecificmachinelearningtechnique.Itistheonlyapproachwhichhasbeenshowntoworkfordeepneuralnetworks.Thisapproacheither(1)reliesonstoringmodelgradients(Wuetal.,2020),or(2)reliesonthemeasurementofsensitivityofmodelparameterstochangesindatasetsusedinfederatedlearning(Taoetal.,2024),or(3)modifiesthelearningprocesstobemoreconducivetounlearning(Bourtouleetal.,2021).

Thelatter,knownasSISA(Sharded,Isolated,Sliced,andAggregated),iscurrentlythebest-knownapproach.Itinvolvesmodifyingthetrainingprocess,butisindependentofspecificlearningalgorithms(Bourtouleetal.,2021).Thisapproachpresetstheorderinwhichthelearningalgorithmisqueriedtoeasetheunlearningprocess.Theapproachcanbedescribedasfollows:

i.Thetrainingdatasetisdividedintomultiple“shards”suchthateachtrainingdatapointispresentinonlyone“shard”.Thisallowsforanon-overlappingpartitionofthedataset.Itisalsopossibletofurther“slice”the“shards”sothatthetrainingismoremodularanddeletioniseasedfurther.

ii.Themodelisthentrainedoneachoftheseshardsorslices.Thislimitstheinfluenceofthedatapointstothesespecificshardsorslices.

iii.Whenarequestforerasureorrectificationarrives,unlearningisperformed,notbyretrainingtheentiremodel,butbyretrainingonlytheshardorslicethathadincludedthe“deleterequested”data.

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Thismethodisflexible.Forinstance,theshardscanbechosensuchthatthemostlikely“deleterequest”dataareinoneshard.Then,fewershardswillneedtoberetrained,assumingthatpersonaldataandnon-personaldataareseparatedaspartofdatacuration.

b.Modelintrinsicunlearning:ThesemethodsaredevelopedforspecificAItechniques.Forinstance,themethodsthataresuitablefordecisiontreesandrandomforestshavebeenshowntobeeffective(Brophy&Lowd,2021)byusinganewapproachtodevelopdecisiontreesandthenrelyingonstrategicthresholdingatdecisionnodesforcontinuousattributes,andathigh-levelrandomnodes.Thenthenecessarystatisticsarecachedatallthenodestofacilitateremovalofspecifictraininginstances,withouthavingtoretraintheentiredecisiontree.

c.Applicationspecificunlearning:Whileexactunlearningisgenerallyexpensiveintermsofcomputationandstorage,someapplicationsandtheiralgorithmsaremoresuitabletoexactunlearning.Specifically,recommendersystemsbasedonk-nearestneighbourmodelsarewellsuitedduetotheiruseofsparseinteractiondata.Suchmodelsarewidelyusedinmanytechniquesincludingcollaborativefilteringandrecentrecommendersystemapproachessuchasnext-basketrecommendation.Usingefficientdatastructures,sparsedataandparallelupdates,personaldatacanberemovedfromrecommendationsystems(Schelteretal.,2023).

4.ApproximateUnlearning:Significantamountoftechnicalliteratureonmachineunlearningfocusesonapproximateunlearning,wherethedataisnotdeleted,butinstead,themodelisadjustedsuchthattheprobabilityoftheinfluenceofthedata,estimatedbasedonproxysignals,onthemodelisreduced.Approximateunlearningislessexpensiveintermsofcomputationandstoragerequirements.

a.Finetuning:Onceamodelistrained,itcanbefinetunedformanypurposesincludingtheapproximateremovaloftheeffectofthedatathathasbeenrequestedtobedeleted(Golatkaretal.,2020;Warneckeetal.,2023).Whenadeletionrequestalongwiththe“removaldataset”(thedatatoberemoved)isreceived,themodelistrainedagainforafewepochsonthis“removaldataset”suchthatthemodel“forgets”it.

b.Influenceunlearning:Approximateunlearningapproacheshavebeenproposedthatrelyonestimatingtheinfluenceofspecificdataonthemodel(Izzoetal.,2021;Koh&Liang,2017).Thisestimationisthenusedtoupdatethemodelforunlearning,whichisakintofinetuning.Usually,theseapproachesalsorequireadditionalmodeltraining.However,toreducethecomputation,itisalsopossibletoprunethemodel(orreducethesize)beforetheunlearningprocess(Jiaetal.,2023).

c.Intentionalmisclassification:Whenarequesttodeletespecificdataaboutapersonisreceived,themodelownerintentionallymisclassifiesthesedatapoints.Thiscanbeachievedwithaccesstothepre-trainedmodelandthedatapointsprovidedbythedatasubjectwiththedeletionrequestbutdoesnotrequireaccesstotherestofthetrainingdataset(Chaetal.,2024).Anotherapproach,saliencyunlearning,tacklestheproblemofunlearningatthelevelofweightsratherthandataormodel.Itreliesonestimatingtheweightsthataremostrelevant(salient)forunlearningbeforedeployingrandomlabelsforthedatatobedeleted(Fanetal.,2024).Thisapproachhasbeenproposedforimageclassificationandgeneration.

d.Parameterdeletion:Anotherapproachtounlearnwithoutdeletingthedatafromthemodelbutremovingitsinfluenceinvolvesstoringalistofdataandparameterupdates

AI-ComplexAlgorithmsandeffectiveDataProtectionSupervision-Effectiveimplementationofdatasubjects’rights

duringthetrainingprocess.Whenadeletionrequestarrives,theparameterupdatesareundone(Gravesetal.,2021).Duetotheneedtostoretheparameterupdates,thisapproachhasahighstoragerequirement,especiallyforlargemodels,althoughlessthanthatforexactunlearning.

5.Differentialprivacyandmodelretiringpolicy:Differentialprivacygivesamathematicalguaranteethatthereisaboundonthecontributionofindividualdatapointtothemodelandthatthiscontributionissmall.However,thecontributionisnotzero,

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thusnecessitating“unlearning”(Chandrasekaranetal.,2021).Oneapproachistocombinedifferentialprivacywithapolicytoperiodicallyretireordeletethemodelandretrainadifferentiallyprivatemodel,insteadofretrainingforeverydeletionrequest.

Whenadeletionrequestisreceived,iftherelevantpersonaldataisinthepossessionofthedatacontroller,thenthedatashouldbedeleted.Themodeldeletionisnotperformedforeveryrequestbecauseitisunclearhowindividualpersonaldatapointsimpactthedifferentiallyprivatemodel.However,oncethereisasufficientlylargenumberofrequests,then,puttogether,thesedatapointswouldaffectthemodel(stillunknownhowexactly),andthusthereisreasonenoughtodeletethemodelandretrainthemodelwithdifferentialprivacy.

3WHATTOUNLEARN

1.Samples:Adeletionrequestforaspecificpieceofinformationorsampleaboutaperson.Methodsdescribedintheprevioussectionhavebeendevelopedforthissetting.

2.Features:Insomeapplications,featuresandlabelsmayholdcertainpersonalcharacteristicsthataretobedeleted.Anapproximateunlearningmethodhasbeenproposedforthispurposebyestimatingtheinfluenceofspecificfeaturesonthemodelparameters(Warneckeetal.,2023).Thismethodcanbeusedtounlearnfeaturesinatrainedmodelforthousandsofdatasubjects.Anotherapproachinvolvesestimatingthecorrelationbetweenfeaturesthatcouldrepresentthepersonalcharacteristicsandthentoprogressivelyunlearnthesefeatures(Guoetal.,2022).Thismethodismostapplicablefordeepneuralnetworksintheimagedomain,forexample,facialrecognitionsystems,wherethedeeperlayersoftheneuralnetworksaresmaller(Nguyenetal.,2022).

3.Class:AIsystemscanbedesignedtoclassifyoutputsintoone,twoormanydifferentclasses.Incertainapplications,thedatatobedeletedisrepresentedasaclassinthetrainedmodel.Insomefacialrecognitionapplications,alldatapointsaboutapersonintheformoffacialimagesbelongtoaparticularclassandifapersonrequestsfortheirpersonaldatatobedeleted,thentheclassificationshouldnotworkforthisperson’sclass.Acoupleofapproximateunlearningmethodsintroducenoisesuchthattheclassificationerrorforthedeletionclassismaximisedandthenthemodelis“repaired”tomaintaintheperformancefortherestofthedata(Chundawatetal.,2023;Tarunetal.,2024).Thesemethodsdonotdeleteallthesamplesassociatedwiththeclass,butinsteadmanipulatethetrainedmodelforthisclassdirectly.

1Itwouldbeimpossibleforamodeltolearnfromthetrainingdataifthecontributioniszero(Bourtouleetal.,2021).

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WhenimageclassificationorfacialrecognitiontechnologyisdevelopedbytrainingConvolutionalNeuralNetwork(CNN)modelswithfederatedlearning,theclassisselectivelyprunedbasedonextractingfeaturesintheimagesthatcontributetodifferentclasses(Wangetal.,2022).Thepersonmakingthedeletionrequestlocallyextractsthesefeaturesfortheirimagesandsendsittothecentralserver,whothenprunestheclassfromtheglobalmodel.

4.Client:WhenAIsystemsaredevelopedwithfederatedlearningthatincludescontributionfrommultipleclients,aclient(oraperson)mightrequestthattheirentirecontributiontotheglobalmodelduetotheirlocaldatasetbedeleted.Duetotheincrementaltrainingprocess,onlydeletingtheupdatestotheglobalmodelmadebythisclientisinsufficienttoremovetheinfluenceofthisclient’sdata.AnapproachknownasFedEraserstoreshistoricalparameterupdatesatacentralservertosanitiseallupdatesthatfollowedtheupdatesofthisclient(Liuetal.,2021).Thesanitisationprocessinvolvescollaborativeupdatesfromtheremainingclientswhosecontributionsarestillpartoftheglobalmodel.

4APPROXIMATEUNLEARNINGVERIFICATION

Approximateunlearningmethodshavebeenproposedwiththeclaimthattheyareindistinguishablefromretrainingthemodelfromscratchwithoutthedeleteddata.Theclaimsareusuallybasedonmetricssuchasindistinguishabilitytoahypotheticallymodelretrainedfromscratch,unlearningaccuracy,remainingaccuracyandmembershipinferenceattacks.

Unlearningaccuracyistheaccuracyoftheunlearnedmodelonthedataexpectedtobeforgotten.Remainingaccuracyistheaccuracyoftheunlearnedmodelontheremainingdata.Membershipinferenceattacks(MIAs)areusedinanattempttoextract“deleted”datafromtheupdatedmodel.Iftheprobabilityofsuchextractionisaround50%,thenthe“deletion”istreatedasasuccess.However,MIAisaprivacyattackandrelyingonitfortestingisunreliable.Awell-developedmodelwillnotbesusceptibletoMIA,inwhichcase,MIAcannotbeusedasaproxysignaltotestunlearning.

Furthermore,approximatelearninglacksstrongguarantees.Thesemetricsdonotaddressaverybasicconcern:itispossibletoobtaintwomodelswithsimilarweightsandparameterswithnon-overlappingtrainingdata(Thudietal.,2022).Thatis,removinganinfluenceofaparticularparameterisnotsufficienttohave“deleted”thedataastheinfluencecouldhavebeenfromadifferentdata.Moreover,theassumptionofhavingtounlearnamodelthatisindistinguishablefromretrainingfromscratchitselfmaynotbetherightapproach.Thisisbecauseamodelretrainedfromscratchcouldhavedifferentmodeldistributionsduetothestochasticityoftraining(Goeletal.,2022;Yang&Shami,2020).

5CONCERNSWITHMACHINEUNLEARNING

1.Privacy:Justlikemachinelearning,machineunlearningalsointroducesprivacyconcerns.Membershipinferenceattacks(Shokrietal.,2017)thathavebeenshowntoattackmachinelearningcanalsobeusedagainstmachineunlearning(Chenetal.,2021).Theconcernhereisthatwhenitispossibletoqueryamodeltwice,oncebeforeunlearningandonceafterunlearning,thepersonqueryingcoulddeducewhichdatawasdeleted.

2.Bias:Whendeletionrequestsaremade,minorityclassesaremoreadverselyaffectedbecausethedatasetsintherealworldarenotbalanced.Whenitcomestodatadeletionrequests,noteveryoneisequallylikelytomakesuchrequests.Ithasbeenshownthatthereisacorrelation

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betweentheunlearningprobabilityandclasslabels(Koch&Soll,2023).Thus,itisimperativethataccuracyofmodelsforsub-categoriesareassessedafterunlearningtoassessforbias.

6LIMITINGPERSONALDATAOUTPUTFROMGENERATIVEAI

Theapproachesdiscussedthusfaraddressapplicationsincludingfacialrecognitiontechnologywherepersonaldataprocessingisconcerned.AIsystemsaresusceptibletoprivacyleakagesandtoadversarialattackssuchasMIA.ThisisalsotrueofgenerativeAIsystems,whichcouldgeneratepersonaldataaspartofitsoutput.TextgenerationAIbasedonlargelanguagemodelshavebeenshowntobemoresusceptibletoMIAthansmallmodels(Carlinietal.,2021).

IngenerativeAIsystems,personaldataisoutputwhenexplicitlyprompted(E.g.,Givemethebirthdateof[personname]).Thesamecantakeplacewithimageandvideogenerationtoolsaswell.Personaldataisalsooutputwhennotexplicitlyprompted.ThesegenerativeAItoolsmakethingsupor“hallucinate”(Maynezetal.,2020)andgeneratefactuallyincorrectcontentthatcouldrevealpersonaldataaboutpeople.E.g.,wheninformationaboutonepersonisaskedandalargelanguagemodeloutputsinformationaboutanotherperson(withtheirname)(D.Zhangetal.,2023).

TheareaofresearchtolimitgenerationofpersonaldatafromgenerativeAIisnew,andmuchlessmaturethanthefieldofmachineunlearning,whichbyitselfisquiteyoung.

1.Modelfinetuning:Inthecaseofdiffusionmodels(e.g.,StableDiffusion),amethodhasbeenproposedtofinetunethemodelsuchthatspecificconceptsarenotoutputintheimages(Gandikotaetal.,2023).Thismethodeliminatesvisualconceptssuchasspecificartisticstyles,nudityandcertainobjects.Asimilarapproachcanbeusedtopreventgenerationofimageswithspecificpersonalcharacteristics(E.J.Zhangetal.,2023).Anotherapproachknownas“selectiveamnesia”appliescontinuouslearningtoforgetconceptsfromgenerativemodelsbasedonvariationalautoencodersanddiffusionmodels(Heng&Soh,2024).

2.Dataredaction:Avariantofmodelfinetuningusesdataandclassredactiontechniquestolimitgenerationofspecificoutputsingenerativeadversarialnetworks(GANs).Asetofdatathatshouldnotbegeneratedisselectedasaredactionset,whichisthenusedtogeneratea“fakedistribution”suchthatoutputsfallingwithintheredactionsetarepenalized(Kong&Chaudhuri,2023).Thisapproachisbasedonsimilarapproachesthatre-trainmodelstolimitgenerationofspecificoutputs(Asokan&Seelamantula,2020;Hannekeetal.,2018;Sinhaetal.,2021).

3.Outputmodification:Theoutputofimagegeneratorscanbemodifiedtonotgeneratespecifickindsofimages.Thiscanbeachievedbytrainingamachinelearningclassifiertomodifyoutputsbeforetheyarerevealedtotheendusers(Randoetal.,2022)orbyincorporatingadditionalinformationandguidingtheinferenceprocess(Schramowskietal.,2023).Alternatively,reinforcementlearningwithhumanfeedbackcanbeused(Baietal.,2022;Ouyangetal.,2022)topreventgenerationofpersonaldata.However,suchmethodshave

manyshortcomings(Casperetal.,2023)andareshowntobeeasytocircumvent,especiallywhentheenduserhasaccesstotheparameters,asisthecasewithfullyopen-sourcemodels.

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CONCLUSION

TheGDPRoffersdatasubjectswithmanyrights.ThisreportcoverstechniquesandmethodstoimplementtherighttorectificationandtherighttoerasurewhenAIsystemsprocesspersonaldata.Implementingtheserightsischallengingbutmanytechnicalapproacheshavebeenproposed.Datacurationandprovenanceareprerequisitesfortheseapproaches.SomeofthechallengessuchasstochasticityoftrainingAImodelscanbemodifiedtomakecompliancewithdataerasurerequestseasier(Bourtouleetal.,2021).Suchdesignchoicesmighthaveperformancetrade-offbutareanaspectofdataprotectionbydesign.OtherimportantrightsofferedbytheGDPRtodatasubjectsarelefttofutureprojects.

Asastrongrecommendationregardingdataprotection,onlytheuseofcompletelyanonymiseddataforthedevelopmentanddeploymentofAImodelswouldavoidobligationsrelatedtothecorrectionanddeletionofpersonaldatainAImodels.Ifitisnecessarytousepersonaldata,includingpseudonymiseddata,todevelopanAImodelthenthelegalobligationstoimplementdatasubjectrightsapply.TheupdatesandchangesmadetotheAImodelshouldbeadequatelyloggedanddocumentedsuchthatsubsequentrequestforrectificationanderasureofpersonaldatacanbefulfilled.

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