Expanding Korean/English Parallel Corpora using Back translation for Neural Machine Translation
coegeun singyeongmangeul iyonghan gigyebeonyeog(NMT: Neural Machine Translation) modeli yeongeo buleo, yeongeo dogileoyi daeyongryang kopeoseueseo usuhan seongneungeul boyeossda[1,2] NMT modeli maeryeog jeogin iyuneun End to End bangsigeuro beonyeoghal su issgi ddaemun ida. jeug, gijonyi tonggye giban gigyebeonyeog modeleun daneo hogeun gu(Phrase) giban beonyeog hu jaebaecihaneun bangsigeuro beonyeoghaneun banmyeon, NMT modeleun Encoder modelro jeonce soseu munjangeul go jeong saijeu begteoro pyohyeonhan hu Decoder modelro jeonce tagis munjangeul beonyeoghayeo culryeoghanda. ddohan, End to End bangsigeuro beonyeoghaneun gwajeongeseo balsaenghaneun janggi jongsogseong(Long term Dependency) munjereul Attention maekeonijeumeul iyonghayeo hyo gwajeogeuro haegyeolhal su issda[3,4] hajiman NMT modelyi ireo han jangjeomeun daeryangyi byeongryeol kopeoseuga bujaehan eoneo ssangyi gyeongu daso musaeghaejinda. ilbanjeogeuro byeongryeol kopeoseuga soryangil gyeong u deiteo hyisoseong(Sparsity) munjega balsaenghamyeo ineun beonyeog modelyi seongneungeul jehanhaneun juyohan yosoro jagyonghanda[5] coegeun NMT modelyi byeongryeol deiteo hyisoseong munjereul haegyeolha gi wihayeo danil eoneo deiteoreul iyonghayeo NMT modeleul hag seubhaneun dayanghan bangbeobdeuli jeandoeeossda. Gulcehreneun eoneo mo deleul NMT modele tonghabhayeo Decoderyi eoneo saengseong neungryeogeul hyangsanghaneun bangbeobeul jeanhayeossda[6] Artetxewa Lampleeun gag gag danil eoneo deiteoman iyonghayeo bijido hagseub bangbeobeuro gigyebeonyeog modeleul hagseubhayeossgo junsuhan seongneungeul boyeossda[7, 8] majimageuro Sennrichneun yeog beonyeogeul iyonghayeo yeongeo dogileo beonyeogeseo hyangsangdoen seongneungeul boyeossda[9] ijung yeog beonyeog bangbeob eun NMT modelyi gujoreul byeongyeonghaji anhgo dogribjeogeuro jeogyonghal su issdaneun jangjeomi issda. bon nonmuneseoneun danil eoneo kopeoseureul iyonghayeo gasang byeong ryeol kopeoseureul habseonghan hu gijon byeongryeol kopeoseureul hwagjanghaneun yeog beonyeog bangbeobeul iyonghayeo hangugeo yeongeo gigyebeonyeog modeleul hag seubhayeossda. yeog beonyeogeul iyonghan gyeongu gibon modelboda yeongeo hangugeo beonyeogeseo +0.48 BLEU jeomsuyi seongneung hyangsangeul boyeossda. bon nonmunyi guseongeun daeumgwa gatda. 2jangeseoneun NMTmodelgwa Attention maekeonijeumeul seolmyeonghago 3jangeseo yeog beonyeogeul iyong han gigyebeonyeog model hagseub bangbeobeul sogaehanda. 4jangeseoneun sil heomhwangyeong seolmyeonghago 5jangeseoneun yeog beonyeog modelgwa gibon modelyi seongneungeul bigyohanda. majimageuro 6jangeseo gyeolron mic hyanghu yeon gureul jesihanda.