文献紹介: A Persona-Based Neural Conversation Model

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A Persona-Based  Neural Conversation Model Jiwei Li, Michel Galley, Chris Brockett, Georgios Spithourakis,  Jianfeng Gao, and Bill Dolan. Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics, pages 994 - 1003, 2016. จݙ঺հ` ௕Ԭٕज़ՊֶେֶɹࣗવݴޠॲཧݚڀࣨɹҴԬເਓ

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"CTUSBDU w࿩ऀҰ؏ੑͷ໰୊Λѻ͏ฦ౴ੜ੒Ϟσϧ wܦྺ΍ελΠϧͷΑ͏ͳݸੑΛೖྗʹ෇Ճ wQFSQMFYJUZ #-&6ͷ྆ํͰੑೳ͕޲্ wਓखධՁͰ΋Ұ؏ੑʹ͓͍ͯੑೳ͕޲্ 2

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*OUSPEVDUJPO wେྔͷਓؒରਓؒͷର࿩ʹΑΔࣗવͳର࿩γεςϜͷ  ߏங͕஫໨ΛूΊ͍ͯΔ w܇࿅σʔλ಺ͷ୅දతͳฦ౴Λฦ͢܏޲͕͋Δ  ˠͦͷΑ͏ͳฦ౴ͷ໬౓͕ߴ͘ͳΓ΍͍ͨ͢Ί wໃ६ͨ͠ฦ౴Λฦ͢͜ͱ͕͋Δ wຊ࿦จͰ͸Ұ؏ੑͱݸੑͷ໰୊ʹ͍ͭͯऔΓ૊Ή 3

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*OUSPEVDUJPO wେྔͷਓؒରਓؒͷର࿩ʹΑΔࣗવͳର࿩γεςϜͷ  ߏங͕஫໨ΛूΊ͍ͯΔ w܇࿅σʔλ಺ͷ୅දతͳฦ౴Λฦ͢܏޲͕͋Δ  ˠͦͷΑ͏ͳฦ౴ͷ໬౓͕ߴ͘ͳΓ΍͍ͨ͢Ί wໃ६ͨ͠ฦ౴Λฦ͢͜ͱ͕͋Δ wຊ࿦จͰ͸Ұ؏ੑͱݸੑͷ໰୊ʹ͍ͭͯऔΓ૊Ή 4

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*OUSPEVDUJPO wେྔͷਓؒରਓؒͷର࿩ʹΑΔࣗવͳର࿩γεςϜͷ  ߏங͕஫໨ΛूΊ͍ͯΔ w܇࿅σʔλ಺ͷ୅දతͳฦ౴Λฦ͢܏޲͕͋Δ  ˠͦͷΑ͏ͳฦ౴ͷ໬౓͕ߴ͘ͳΓ΍͍ͨ͢Ί wໃ६ͨ͠ฦ౴Λฦ͢͜ͱ͕͋Δ wຊ࿦จͰ͸Ұ؏ੑͱݸੑͷ໰୊ʹ͍ͭͯऔΓ૊Ή 5

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ؔ࿈ݚڀ w3JUUFSΒ ͸౷ܭతػց຋༁ͷ໰୊ͱͯ͠औΓ૊Μͩ w4FSCBOΒ ͸ର࿩ཤྺ΁ͷґଘؔ܎Λิ଍͢Δ͜ͱΛ ໨తͱͨ͠֊૚తFODPEFSEFDPEFSϞσϧΛఏҊ w-JΒ ͸యܕతԠ౴ͷׂ߹ΛݮΒͨ͢Ίʹ  ࠷େ໬౓ .-& Ͱ͸ͳ͘૬ޓ৘ใྔ ..* Λ໨తؔ਺ͱ͢Δ TFRTFRγεςϜΛఏҊ 6

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ఏҊϞσϧ 7

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ఏҊϞσϧ wதؒ૚Ϣχοτʹ-45.Λ༻͍ͨ3// w࠷ޙͷग़ྗΛ%FDPEFSʹ౉͢ 8 &ODPEFS

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ఏҊϞσϧ wதؒ૚Ϣχοτʹ-45.Λ༻͍ͨ3// w&ODPEFSͷग़ྗΛ%FDPEFSʹೖྗ w4QFBLFS&NCFEEJOHΛ֤ӅΕ૚ͰՃࢉ 9 %FDPEFS

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ఏҊϞσϧ w4QFBLFS.PEFM  ฦ౴ऀͷݸੑͷΈΛߟྀ  4QFBLFS&NCFEEJOHΛೖྗ w4QFBLFS"EESFTTFF.PEFM  ฦ౴ऀͱฉ͖खͷ྆ํΛߟྀ  ԼࣜͰ4QFBLFS&NCFEEJOHΛ߹੒ 10

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%FDPEJOHBOE3FSBOLJOH ɹ.ೖྗจɹ3ฦ౴จɹc3cฦ౴จ௕  ɹW4QFBLFS*%ɹЕ Ѝௐ੔ύϥϝʔλ w#FBN4FBSDI࣌ʹ্ࣜͷධՁؔ਺Ͱ3FSBOLJOHΛߦ͏ wయܕతͰͳ͘௕͍จ͕༏ઌ͞ΕΔ wɹɹɹɹɹ͸3͔Β.Λग़ྗ͢ΔTFRTFRΛֶशͯ͠ܭࢉ 11

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σʔληοτ w5XJUUFS1FSTPOB%BUBTFU  ೥݄͔Βϲ݄෼ͷ5XJUUFS'JSF)PTFΛ࢖༻  ظؒ಺ʹճҎ্λʔϯͷձ࿩Λͨ͠Ϣʔβʹݶఆ  ϢʔβʹΑΔ ૊ͷձ࿩ؚ͕·ΕΔ  ಉϢʔβʹΑΔ೥݄͔Βϲ݄෼ͷձ࿩Λ૊  ͣͭ։ൃ ݕূ ςετηοτͱͯ͠ઃఆ  ฦ౴ऀͷ4QFBLFS*%ͷΈ͕ೖ͍ͬͯΔͨΊ4QFBLFS.PEFM  ͷΈʹར༻ 12

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σʔληοτ w5XJUUFS4PSEPOJ%BUBTFU 4PSEPOJ   ैདྷͷ405"ͱͷൺֱͷͨΊʹ࢖༻  ςετηοτͷΈ࢖༻  ૊ͷձ࿩σʔλ  ͭͷೖྗจʹରͯ͠࠷େݸͷฦ౴  ˠ5XJUUFS1FSTPOB%BUBTFUͱͷ#-&6ͷൺֱ͸Ͱ͖ͳ͍ 13

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σʔληοτ w5FMFWJTJPO4FSJFT5SBOTDSJQUT%BUB  57γϦʔζl'SJFOETz l5IF#JH#BOH5IFPSZzͷࣈນ  ਓͷओཁਓ෺ʹΑΔ ૊ͷձ࿩  ͏ͪ։ൃ ςετηοτͱͯͦ͠ΕͧΕ ૊࢖༻ w0QFO4VCUJUMFT  ϊΠζΛؚΉ.ʙ.ͷࣈນσʔληοτ  5FMFWJTJPO4FSJFT5SBOTDSJQUT%BUBͷن໛͕খ͍ͨ͞Ί  ຊσʔληοτͰυϝΠϯదԠΛߦ͏ 14

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ֶशͷৄࡉ wMBZFS-45. w IJEEFODFMMTGPSFBDIMBZFS w#BUDITJ[F w-FBSOJOHSBUF w<>ͷҰ༷෼෍ͰύϥϝʔλΛॳظԽ w5ISFTIPMEGPSHSBEJFOUDMJQQJOH w7PDBCVMBSZTJ[F w%SPQPVUSBUF w#FBNTJ[F 15

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݁Ռ w5XJUUFS4PSEPOJEBUBTFUʹ͓͚ΔධՁ w.5CBTFMJOF͸4.5ʹΑΔख๏ wPVSTZTUFN͸5XJUUFS1FSTPOB%BUBTFUͰֶशͨ͠΋ͷ wֶशίʔύεͷن໛ %SPQPVUͷ࢖༻ ର৅Ϣʔβͷબผ͕  վળͷཧ༝ͱߟ͑ΒΕΔ 16

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݁Ռ w5XJUUFS1FSTPOBEBUBTFUʹ͓͚ΔධՁ w.-&ͷ৔߹͸ ..*ͷ৔߹͸ͷվળ wఏҊख๏͸..*ΑΓ.-&ʹΑΓ༗ӹ 17

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݁Ռ w57TFSJFTσʔληοτʹ͓͚ΔධՁ w4QFBLFS.PEFM 4QFBLFS"EESFTTFF.PEFMͷ͍ͣΕ΋  #-&6είΞΛ޲্ͤ͞Δ wఏҊ͢ΔͭͷϞσϧͷؒʹେ͖ͳҧ͍͸ͳ͍  ˠਓͷύλʔϯ͕ัଊͰ͖ΔఔσʔλαΠζ͕େ͖͘ͳ͍ 18

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݁Ռ w5XJUUFS1FSTPOB%BUBTFUͷ։ൃσʔλͱ  57TFSJFTEBUBTFUͰͦΕͧΕQFSQMFYJUZΛൺֱ w5XJUUFSͷํ͕ߴ͘ͳΔͷ͸ϊΠζͷͨΊͱߟ͑ΒΕΔ 19

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݁Ռ wϥϯμϜʹਓͷ4QFBLFS&NCFEEJOHΛ  4QFBLFS.PEFMʹೖྗ 20

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݁Ռ w4QFBLFS"EESFTTFF.PEFM  ͷධՁ wฦ౴ऀʹහײͰ͋Δ͜ͱ͕  ୯ޠ͔Β෼͔Δ wlIJNz͔ΒੑผΛਖ਼͘͠  ೝ͍ࣝͯ͠Δ͜ͱ͕෼͔Δ 21

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ਓखධՁ wΫϥ΢υιʔγϯάΛ࢖ͬͯग़ྗΛධՁ w4QFBLFS*%ຖʹग़ྗ͕Ұ؏͍ͯ͠Δ͔Λ࣮ݧ wϕʔεϥΠϯͱ1FSTPOB.PEFMͷग़ྗΛൺֱͯ͠  ʮҰ؏͍ͯ͠Δʯ͸ ʮ΍΍Ұ؏͍ͯ͠Δʯ͸   ಉఔ౓Ͱ͋Δ৔߹͸ͷείΞΛ෇͚Δ wਓͷධՁऀͷείΞΛฏۉ͠ɺ౳෼ͷ࠶ׂ౰Λߦ͏ 22

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ਓखධՁ݁Ռ wಉఔ౓ͷ৔߹Λແࢹ͢Δͱɺͷࣄྫʹ͓͍ͯ  1FSTPOB.PEFM͕ʮҰ؏͍ͯ͠Δʯʮ΍΍Ұ؏͍ͯ͠Δʯ ͱ൑ఆ͞Εͨ wʮ΍΍Ұ؏͍ͯ͠ΔʯΛແࢹ͢Δͱɺ1FSTPOB.PEFM͕  ࣄྫͷͰ༏ҐͱͳΓɺϕʔεϥΠϯ͸ʹཹ·Δ 23

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࣮ࡍͷग़ྗࣄྫ 24

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࣮ࡍͷग़ྗࣄྫ 25

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݁࿦ w1FSTPOBCBTFEͷԠ౴ੜ੒ϞσϧΛఏࣔ w#-&6 QFSQMFYJUZ Ұ؏ੑͷਓखධՁʹ͓͍ͯ  ܶతͰ͸ͳ͍΋ͷͷϕʔεϥΠϯΛ্ճΔ݁Ռ wฦ౴ऀฉ͖खͷਓΛೖྗ͢Δ͜ͱʹϝϦοτ͕͋Δ͜ͱ ͕4QFBLFS"EESFTTFFϞσϧͷ݁ՌͰࣔ͞Εͨ 26