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Cross-LanguageUrdu-English(CLUE)TextAlignmentCorpusNotebookforPANatCLEF2015IsrarHanif,RaoMuhammadAdeelNawab,AfffaArbab,HumaJamshed,SaraRiaz,andEhsanUllahMunirDepartmentofComputerScience,COMSATSInstituteofInformationTechnology(Wah&LahoreCampuses),Pakistan.
aoaisrar@bzu.
edu.
pk,adeelnawab@ciitlahore.
edu.
pk,nagrah2012@gmail.
com,humaj62@gmail.
com,sarariaz15@gmail.
com,ehsanmunir@comsats.
edu.
pkAbstractPlagiarismiswellknownproblemoftheday.
Easyaccesstoprintandelectronicmediaandreadytousematerialmadeiteasytoreusetheexistingtextinnewdocument.
Theseverityoftheproblemismuchreducedinmonolingualcontextbytheautomatedandtailoredeffortmadebytheresearchcommunitybuttheissueisyetnotproperlyaddressedincrosslanguage(CL)textreuse.
AnystoryorarticlewritteninanysourcelanguagelikeUrduissimplytranslatedintargetlanguagelikeEnglishandtranslatorclaimsitashisown.
Availabilityofstandardandsimulatedresourceaddresstheissueandactastestbedforanalyzingandimplementingavailableplagiarismdetectionapproaches.
Theresearchworkisaimedatenrichingtheavailablecross-languagecorpusandontheotherhandprovidingabenchmarkcorpustoCrossLanguagePlagiarism(CLP)domain.
1IntroductionTextreuseistheprocessofdevelopinganewdocumentusingthedataofexistingdoc-uments.
Plagiarismisamostfamiliartypeoftextreuse.
Ingeneral,plagiarismiscon-sideredasreuseofthoughts,procedures,outcomes,orwordswithoutclearlyshowingtheoriginalsource.
Thesizeoftextthatisreusedvariesfromcasetocase.
Insomecon-ditionsauthorsuseonlyphrases,sentencesorpassagestocreatenewdocumentwhileinsomeconditions,wordbyworddocumentisreusedtocreateanewdocument.
Tocreateanewdocumentdatacanbecollectedfromdifferentsourcedocuments.
Insomeconditionsentiredocumentoforiginaltextisreusedtocreatenewdocument.
Possiblewaystodetectplagiarismare(1)IntrinsicPlagiarismDetection-indicatingwhetherallpassageswrittenbysingleauthorand(2)ExtrinsicPlagiarismDetection-pointingallsourcesfromwherepassagesareusedtocreatethesuspiciousdocument[18].
PlagiarismhascrossedthelanguageboundariesnowlikeUrdutoEnglishorany.
Translationaltechnologiesaregivingnewwaysofplagiarism,knownascrosslanguageplagiarism(CLP).
Incrosslanguageplagiarism,sourcematerialistranslatedfromonelanguagetoanotherandthentranslateddataisreusedtodevelopanewdocumentwith-outgivingreferencesoftheoriginalsource.
Generallysuchunattributedtextreuseisalsolabeledasplagiarism[8].
InthistypeofplagiarismonlylanguagechangeoccurssuchasfromUrdutoEnglishorviceversa.
That'swhycrosslanguageplagiarismisalsocalledtranslationplagiarism.
Barron-CedenoalsodenesCLPasapieceoftextinonelanguagetranslatedintoatargetlanguagewhilekeepingthecontentandsemanticssamewithoutreferringtheorigin[2].
AvailabilityofreadytousedataindifferentformatsandinmultiplelanguagesoninternetisalsoboostingthecaseofCLP.
Studentassignments,andnewspaperstoriesandarticlesarehotdomainsforCLPaseducationandinformationhasnobarriersandboundaries.
CLPneedstodevelopabenchmarkcorpushavingsourceandtargetlan-guagedocumentpairstodetectanylevelofplagiarism.
Urduisalanguagewithmorethan100millionnativespeakers1.
Fewcorpusesaredevelopedforcross-languageinformationretrieval(CLIR)[7]butnoseriousefforthasbeenmadetoaddressCLPproblem.
Englishisanofcialandalmosteducationallanguageinindo-Pakregion.
ThisdiversityraisedtheCLPissueswithmorepotentialinthisregionespeciallyinhighereducationsector[6].
ThereforedevelopinganUrdu-EnglishcorporaforCLPdetectionismuchneededareatobefocused.
ThisresearchisaimedatgeneratingastandardcorpusinUrdu-Englishlanguagepairs.
ThecorpuswillserveasbaseforCLPdetectionandanalyzingmultipleeval-uationtechniquesincontextofperformance.
Threelevelsofplagiarism(NearCopy,LightRevision,andHeavyRevision)enabledittodetectplagiarismatdifferentlevels.
Automatedandmanualefforttogeneratesuspiciousdocumentmadethecorpusmorerealisticandprecise.
Therestofthepaperisorganizedasfollows.
Section2summarizestherelatedwork.
Section3describescorpusgenerationprocessindetail.
Analysisaboutcorpusispresentedinsection4.
Finally,section5concludesthepaper.
2RelatedWorkGenerationofcorpususingsimulatedandarticialapproachasrecommendedbyPot-thastetal.
isinpracticenow[16].
CloughandStevensonin2011createdashortanswercorpuswhichcontainsplagiarizedexamplesgeneratedbasedonsimulatedformat[4].
Similareffortwasmadebysteinetal.
forPAN-PC-09[17]andbyPotthastetal.
forPAN-PC-10corpus[9].
Inspiteofthefactthatresearchcommunityisaddressingtheplagiarismissuepo-tentially,itismajorlyyetlimitedtomonolingualaspect.
TheminoreffortmadeincrosslingualaspectoftheproblemisalsolimitedtofewEuropeanlanguageslikeSpanishandGermanassourceandEnglishassuspiciousinsource-suspiciouslanguagepairs.
DifferentcrosslingualcorporalikeEnglish-Spanish[19]andEnglish-Germancor-pus[10][12][15][13][14]andmanyothershavebeendevelopedfordetectionandanalysisinthisdomain.
NewPAN@FIREtaskslike(CL!
NSS)isanefforttotracesimilarnewsstoriesacrossthelanguages[5].
In2009,EuropeanCommissionsofceforofcialpublications(OPOCE)createdacorpusforcrosslanguageresearch.
Cross-LanguageIndianTextReuseCompetitioncorpusisastandardcorpusinEnglish-Hindilanguagepairperspective[1].
Wikipediaarticleswereselectedassourceincomputerscienceandtourismwith112documentsassourceand276suspiciousdocumentsfordifferentlevelsofplagiarizedfragments.
Alongwithcorpuscreation,applyingplagia-rismdetectionapproachesonnewlycreatedandalreadyavailablecorpusesisalsoinpractice.
TheJRC-AcquisMultilingualParallelCorpuswasusedbyPotthastetal.
toapplyCLPdetectionapproaches.
23,564documents,extractedfromlegaldocumentsofEuropeanUnion,incorporatethecorpus[11].
Outof22languagesinlegaldocumentcollection,only5includingFrench,Germen,Polish,DutchandSpanishwasselectedtogeneratesource-suspiciouslanguagepairwithEnglishlanguageassource.
Compara-bleWikipediaCorpusisanotherexampleofexperimentingwithsimilarapproach.
Thecorpuscontains45,984documents.
ApplyingCLPdetectionapproachesonmultiplecorporahavealsobeendonebyCeskaetal.
[3].
TwocorpusesJRC-EUandFairy-taleCorpuswereusedforthepur-pose.
JRC-EUcomposedof400documentsrandomlyextractedfromlegislationreportsofEuropeanUnion.
Outthese400documents,200wereinEnglishassourceandre-maining200wereinCzech.
Fairy-taleCorpuswith54documentsoutofwhich27inEnglishand27inCzechtranslatedfromEnglish,wasthepartofexperiment.
3CorpusGenerationProcessForthePAN2015TextAlignmenttask,wesubmittedacross-languagecorpus(Urdu-Englishlanguagepair)forevaluatingtheperformanceofCLPdetectionsystem.
TheCLUEcorpuscontainssimulatedcasesofplagiarism(sourcefragmentsareinEnglishandsuspiciousonesinEnglish).
3.
1GenerationofSource-SuspiciousFragmentPairsTogeneratesource-suspiciousfragmentpairs,wecollectedsourcetextsfromtwodo-mains:(1)computerscienceand(2)generalessaytopics.
AllthesourcefragmentswerecollectedfromWikipedia(http://ur.
wikipedia.
org/wiki/urduinfootnote).
Itislikelythattheamountoftextreusedforplagiarizemayvaryfromaphrase,sentence,paragraphtoentiredocument.
Therefore,thesourcefragmentsweredividedintothreecategories:(1)small(lessthan50words),(2)medium(50-100words)and(3)large(100-200)words.
Table1showsthedistributionofsource-suspiciousfragmentParis.
Togeneratesimulatedcasesofplagiarismparticipants(volunteers),whowereuni-versitystudents(undergraduateandpostgraduate)wereaskedtorewritethesourcefrag-ment(inUrdu)togeneratetheplagiarizedfragment(inEnglish)usingoneofthethreemethods.
i.
NearCopy:Participantsweretoldtoautomaticallytranslatethesourcefragmenttogeneratetheplagiarizedfragment.
ii.
LightRevision:Usingthisapproach,theplagiarizedfragmentwascreatedintwosteps.
Intherststepsourcefragment(inUrdu)isautomaticallytranslatedintoEnglish.
Inthesecondstep,thetranslatedfragmentispassedthroughanautomatictextrewritingtoolcalledArticleRewriter1togeneratetheplagiarizedfragment(i.
e.
lightrevisionofthesourcefragment).
iii.
HeavyRevision:Participantswereinstructednottousetheautomaticmachinetranslationtoolsforgeneratingheavyrevisionofthesourcetext.
Instead,theywereaskedtomanuallytranslatetheoriginalsourcetextinsuchawaythatitlookslikeaparaphrasedcopyofthesourcetext.
Leveloffragments(words)(Approx.
)LevelnameNooffragments(270)CS(180)GL(90)50and=100and<=200Essay(Large)3015Table1.
Statisticsofsource-suspiciousfragmentpairsusedintheproposedcorpus3.
2DocumentCollectionandCorpusCompositionTheproposedcorpuscontainstotal1000documents(500sourcedocuments(inUrdu)and500suspiciousdocuments(inEnglish)).
Allthedocumentsinthecorpusarecol-lectedfromfreelyavailableonlineresources.
Adocumentinthecorpusbelongstothedomainofcomputerscienceorgeneraltopics.
Computersciencetopics(Total50)mainlyincludes:Freesoftware,OpenSource,BinaryNumbers,DatabaseNormaliza-tion,Articialintelligence,Robotics,MobileApps,Yahoo,MSN,Google,Whatsapp,Android,twitter,Facebook,RUBYlanguage,Gmail,Skype,Dailymotion,HTMLandfewothers.
Generaldomaintopicswerealsosameincountandmainlyinclude:Globalwarming,MuhammadIqbal,Capitalism,Bookselling,Mosque,PakistanAirForce,Two-Nationtheory,Cricket,Fashion,Capitalism,LahoreForte,BadshahiMasjid,Glob-alizationandfewothers.
Outof500suspiciousdocuments,270areplagiarizedandremaining230arenon-plagiarized.
Onlyonesource-plagiarizedfragmentpairwasin-sertedintoonesource-suspiciousdocumentpair.
Computersciencesource-plagiariesfragmentpairswereinsertedintocomputersciencesource-suspiciousdocumentsandsimilarlysource-plagiarizedfragmentpairsongeneraltopicswereinsertedintosource-suspiciousdocumentpairswhichbelongedtothedomainofgeneraltopics.
Outof270source-plagiarizedfragmentpairs,180arefromComputerSciencedo-mainand90fromGeneraltopicsdomain.
Allthesource-plagiarizedfragmentpairswererandomlyinsertedintosource-sus-piciousdocumentpairs.
4AnalysisandDiscussionThedevelopedcorpusisdividedintosourceandsuspiciousdocuments.
AlthoughthemanualrevisionisdoneoneachsourcefragmenttogenerateitsNC,LRandHRver-sionbuttheorderofsentenceswaskeptsame.
Manualrevisionwasdonetoovercomeissuesgeneratedbyautomatictranslationtoolsoutcome.
ProvidingSource(Urdu)ver-siontoparticipantforgeneratingitsHeavyRevision(HR)madetheplagiarizedtextmorerealistic.
5ConclusionThepaperdescribesthecorpuscreationprocessfordetectionofplagiarismincrosslanguagedomainofUrdu-Englishpairs.
Thecorpuscanbeusedasbenchmarkortestbedforupcomingtasksofperformanceevaluationamongdifferentplagiarismdetectiontechniques.
Infutureweintendtoincreasethesizeofcorpus.
6PeerReviewFollowingdatasetswereobservedandmostofthexmlfeaturesincludinglengthandoffsetofthefragmentinsertedinsourceandsuspiciousdocumentswerefoundcorrectinalldatasets.
Amismatchwasalsofoundinfewcasesduetonewlineandsomespe-cialcharacters.
Datasetwiseotherndingsaredescribedas:–cheema15-training-dataset-englishDifferentfoldersareusedtoconsidercasesofplagiarismatundergrad,MasterandPh.
Dlevels.
Fragmentsareinsertedatcharacterlevelatrandomplaces.
Sourcetosuspiciousratioisontooneassinglesourcefragmentisusedtomakeadocumentsuspicious.
ObfuscationstrategyisalmostparaphrasingwithgoodqualityPairEntry/ExampleType/Articial/SimulatedQualityofPlagiarismsuspicious-document0099-source-document0391.
xmlSimulatedWellparaphrasedsuspicious-document0259-source-document0189.
xmlSimulatedGoodsuspicious-document0309-source-document0321.
xmlSimulatedWellparaphrasedsuspicious-document0386-source-document0186.
xmlSimulatedWellparaphrasedsuspicious-document0485-source-document0447.
xmlSimulatedNEARCOPY–palkovskii15-training-dataset-englishMultilingualfeaturesalthoughdescribedbutobfuscationislimitedtoEnglishonly.
Fragmentsareinsertedatwordlevelatrandomplacesinsuspiciousdocument.
Sourceandsuspiciousdocumentsareoflargesizeandfromgeneraldomain.
PairEntry/ExampleType/Articial/SimulatedQualityofPlagiarismsuspicious-document00021-source-document02467.
xmlArticialNEARCOPYsuspicious-document00067-source-document02563.
xmlArticialNEARCOPYsuspicious-document00081-source-document03075.
xmlArticialNEARCOPYsuspicious-document00380-source-document00270.
xmltranslation-chainNEARCOPYsuspicious-document00407-source-document02140.
xmltranslation-chainNEARCOPY–mohtaj15-training-dataset-englishMultiplefragmentsareinsertedinsingledocumentatrandomplaces.
Inmostofthecases3fragmentsareinsertedatcharacterlevel.
Placementoffragmentsisatrandomplacesinsourceandsuspiciousdocuments.
Althoughinfewcasesfrag-mentsinsourceandsuspiciousdocumentswerefoundirrelevantbutdatasetiswellcomposedoverall.
Largesizeddocumentsfromgeneraldomainareused.
PairEntry/ExampleType/Articial/SimulatedQualityofPlagiarismsuspicious-document110926-source-document307308.
xmlArticialNEARCOPYsuspicious-document179883-source-document517709.
xmlArticialNEARCOPYsuspicious-document235057-source-document534046.
xmlArticialNEARCOPYsuspicious-document102450-source-document106487.
xmlArticialPoorsuspicious-document405184-source-document26685.
xmlSimulatedGoodsuspicious-document105415-source-document149775.
xmlArticialGoodsuspicious-document157936-source-document198805.
xmlSimulatedGood–kong15-training-dataset-chineseSametextisusedtosuspectmanydocuments.
Smallsizeddatasetwithonly4suspiciousand78sourcedocuments.
Suspicioustextisinsertedatconsecutivelo-cationsprobablyatcharacterlevel.
BothsourceandsuspiciousdocumentsareinChinesebutdocumentsalsohavelargeEnglishtextinfewcases.
Qualityofplagia-rismcannotbejudged.
–khoshnava15-training-dataset-persianAdatasetwith720suspiciousand802sourcedocuments.
Almostone-to-onesourcetosuspiciousratioisthere.
Articialtypeofplagiarismcaseswithnoob-fuscationstrategymostly.
BothsourceandsuspiciousdocumentsareinPersianthereforequalityofplagiarismcannotbejudged.
–Asghari15-training-dataset-english-persianLargedatasetwith15959sourceand5470suspiciousdocuments.
MostofthePlagiarismcasesarearticiallygenerated.
DuetoEnglishtoPersiannaturequalityofplagiarismcannotbejudgedproperly.
Formationofdatasetisne.
–alvi15-training-dataset-englishAdatasetwith70sourceand90suspiciousdocuments.
Threetypesofobfusca-tionstrategiesareused:charactersubstitution,synonymreplacementandhumanretelling.
Onesourcefragmentisusedindifferentobfuscationstrategiestosuspectthesuspiciousdocument.
Insertionisatsentencelevelandalmostnearcopyorexactcopyofsourcefragmentisusedinsuspiciousdocuments.
Thereissomedif-ferenceinthesourcelength,sourceoffset,suspiciouslengthandsuspiciousoffsetbecauseofnewlinecharacter.
PairEntry/ExampleType/Articial/SimulatedQualityofPlagiarismsuspicious-document00003.
txtsource-document00002.
txtRetellingGoodsuspicious-document00043-source-document00018.
xmlRetellingGoodsuspicious-document00102-source-document00040.
xmlRetellingGoodsuspicious-document00128-source-document00078.
xmlAutomaticWellparaphrasedsuspicious-document00039-source-document00010.
xmlcharacter-substitutionGoodsuspicious-document00078-source-document00020.
xmlcharacter-substitutionWellparaphrasedsuspicious-document00099-source-document00025.
xmlcharacter-substitutionWellparaphrasedAcknowledgementsWearethankfultoallvolunteersfortheirvaluablecontributioninconstructionofthiscorpus.
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