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Delete, Retrieve, Generate:
 A Simple Approach to
 Sentiment and Style Transfer Juncen Li, Robin Jia, He He, Percy Liang. Proceedings of NAACL-HLT 2018, pages 1865–1874, 2018. จݙ঺հ ௕Ԭٕज़Պֶେֶࣗવݴޠॲཧݚڀࣨ ҴԬເਓ

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"CTUSBDU wײ৘ͳͲͷଐੑΛɺଐੑʹґଘ͠ͳ͍಺༰Λ
 อ࣋ͭͭ͠ม׵Λߦ͏λεΫ wֶशʹ͸ଐੑͷΈҟͳΔΑ͏ͳจϖΞΛ࢖༻͠ͳ͍ wϑϨʔζΛ%FMFUF 3FUSJFWFͯ͠ɺͦΕΒΛݩʹ
 ࠷ऴతͳग़ྗΛ(FOFSBUF͢Δ wैདྷख๏ΑΓଟ͘ͷೖྗʹ͓͍ͯจ๏త͔ͭ ద੾ͳग़ྗ͕ੜ੒͞ΕΔ͜ͱΛਓखධՁͰ֬ೝ !2

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*OUSPEVDUJPO w ײ৘΍ελΠϧɺ੍࣌ͷΑ͏ͳଐੑΛ੍ޚͰ͖Δ จੜ੒ʹؔ৺͕ߴ·͍ͬͯΔ w ௨ৗɺଐੑͷΈҟͳΔύϥϨϧσʔλ͸࢖༻
 Ͱ͖ͣɺଐੑ͕ϥϕϧ෇͚͞ΕͨจͷΈΛ࢖༻ w ͜Ε·Ͱʹ("/Λ༻͍ͨख๏͕ఏҊ͞Ε͍ͯΔ͕ɺ ग़ྗ͕௿඼࣭Ͱ͋Δ͜ͱ͕ਓखධՁͰ൑໌ !3

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*OUSPEVDUJPO w ଐੑʹӨڹΛ༩͑Δ୯ޠ΍۟
 Ҏ֎͸΄ͱΜͲมߋͤͣ͞ʹ
 ଐੑม׵Ͱ͖Δ৔߹͕ଟ͍ w ΑΓ୯७Ͱֶश͕؆୯ͳ
 Ұ࿈ͷγεςϜΛఏҊ !4

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"QQSPBDI !5

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"QQSPBDI !6

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"QQSPBDI !7

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"QQSPBDI !8

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"QQSPBDI !9

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"QQSPBDI !10

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"QQSPBDI !11

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"QQSPBDI !12

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"QQSPBDI !13

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"QQSPBDI !14

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%FMFUF w ײ৘ଐੑͷ৔߹ɺlQPTJUJWFzͷ࣌ʹݶͬͯΑ͘ग़ݱ ͢ΔOHSBNͱlOFHBUJWFzͷ࣌ʹݶͬͯΑ͘ग़ݱ
 ͢ΔOHSBNΛଐੑϚʔΧͱͯ͠࡟আ w OHSBN͔ΒଐੑΛ෼ྨ͢ΔφΠʔϒϕΠζ෼ྨث ʹ͓͚ΔOHSBNͷ৚݅෇͖֬཰͕ࢦఆͷᮢ஋Λ
 ௒͑ͨࡍʹଐੑϚʔΧͱ͢Δ !15

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3FUSJFWF w ͭͷ୯ޠܥྻͷڑ཭͕Ұ൪খ͍͞΋ͷΛऔΓग़͢ w ڑ཭ͷܭࢉํ๏͸ҎԼͷͭΛ࣮ݧ 5'*%'ͰॏΈ͚ͮΒΕͨ୯ޠͷॏͳΓ DPOUFOUFNCFEEJOHTͷϢʔΫϦουڑ཭
 ˢEFMFUFޙͷจΛ3//FODPEFSʹೖྗͨ݁͠Ռ !16

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(FOFSBUF %FMFUF0OMZ w %FMFUFޙͷจͱଐੑ͔Β%FMFUFલͷจΛ෮ݩ͢Δ Α͏ʹֶशΛߦ͏ !17

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(FOFSBUF %FMFUF"OE3FUSJFWF w ී௨ʹֶशͤ͞Δͱɺจ΁ଐੑϚʔΧΛ݀ຒΊ͢Δ ͚ͩͷֶशʹͳͬͯ͠·͏
 ˠεϜʔδϯά͕ߦΘΕͣྲྀெʹͳΒͳ͍ w ଐੑϚʔΧ΁֬཰తʹϊΠζΛՃ͑Δ
 ˡฤूڑ཭͕ͰಉଐੑͷผϚʔΧ΁ஔ͖׵͑Δ !18

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&YQFSJNFOUT w :FMQϨϏϡʔɺ"NB[POϨϏϡʔͷײ৘Λ൓స w ը૾ΩϟϓγϣϯΛΑΓϩϚϯνοΫ͔ϢʔϞϥε ʹͳΔΑ͏มߋ w ैདྷख๏ɺ)VNBO3FGFSFODFɺఏҊ͢Δͭͷ
 γεςϜΛൺֱ w )VNBO3FGFSFODF͸.5VSLͰऩू !19

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%BUBTFUT w Ωϟϓγϣϯͷςετηοτ͸ࣄ࣮ͷΈͰ͋ΔͨΊ
 ଐੑϚʔΧͷ࡟আ͸ͳ͘ɺૠೖͷΈ !20

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&YQFSJNFOUBM%FUBJMT w EJNFOTJPOBMXPSEWFDUPST w TJOHMFMBZFS(36XJUIIJEEFOVOJUT w NBYPVUBDUJWBUJPOGVODUJPO w "EBEFMUBXJUIBNJOJCBUDITJ[FPG w CFBNTFBSDIXJUIBCFBNTJ[FPG !21

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)VNBO&WBMVBUJPO w .5VSLͰޏͬͨϫʔΧʔ͕γεςϜͷग़ྗΛධՁ w ஈ֊ͷϦοΧʔτई౓Ͱจ๏ੑɺଐੑɺ
 ҙຯͷอ࣋ΛධՁ w ·ͨ͸ͱධՁ͞Εͨ৔߹ʹग़ྗ͸੒ޭͱݟ၏͢ w ແ࡞ҝʹநग़ͨ͠αϯϓϧΛධՁ
 ʢ֤ଐੑ͝ͱʹαϯϓϧʣ !22

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)VNBO&WBMVBUJPO !23

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$PODMVTJPO w ςΩετଐੑม׵ʹ͓͍ͯैདྷͷ("/ʹΑΔख๏ ΑΓߴੑೳͳख๏ΛఏҊ w จͷଐੑʹӨڹΛ༩͑Δ۟͸ہॴతͰ͋Δ͜ͱ͕ ޮՌΛେ͖͍ͯ͘͠Δ w কདྷతʹ͸OHSBNΑΓҰൠతͳଐੑͷ֓೦Λ։ൃ ͢Δͱ༗ӹ͕ͩɺΑΓؼೲతόΠΞεΛ൐͏ !24