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©2023 Wantedly, Inc. ࿦จ঺հɿImproving Implicit Feedback-Based Recommendation through Multi-Behavior Alignment ΢ΥϯςουϦʔࣾ಺ษڧձ~ਪન࿦จಡΈձ~ Nov. 22 2023 - ߹ాपฏʢ΢ΥϯςουϦʔגࣜձࣾʣ Xin Xin et al., 2023 https://dl.acm.org/doi/10.1145/3539618.3591697

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©2023 Wantedly, Inc. ࣗݾ঺հ ໊લɿ 
 ߹ా पฏ(Shuhei Goda) ॴଐͱ໾ׂɿ 
 ɾ΢ΥϯςουϦʔגࣜձࣾ(2019~) 
 ɾਪનνʔϜϦʔμʔ 
 ɾML Tech Lead & Product Manager 
 
 Kaggle Tierɿ 
 Kaggle Competitions Grandmaster @hakubishin3 @jy_msc @shuheigoda

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©2023 Wantedly, Inc. αϚϦʔ ෳ਺ͷߦಈ৘ใΛΞϥΠϝϯτͯ͠ਅͷᅂ޷Λਪఆ͢Δख๏ΛఏҊͨ͠࿦จ • Ϟνϕʔγϣϯɿෳ਺ͷߦಈσʔλΛֶशʹ࢖͏͜ͱͰɺ֤ߦಈσʔλͷܽ఺Λิ͍͍ͨ • ՝୊ɿ • ߦಈσʔλ෼෍ͷؒʹ͸Ϊϟοϓ͕͋Δ • औಘ͕༰қͳߦಈσʔλ΄ͲϊΠζ͕େ͖͍ • ղܾํ๏ɿ • Ϣʔβʔͷਅͷᅂ޷Λજࡏม਺ͱ͠ɺͦΕʹج͍ͮͨߦಈ݁Ռ͕؍ଌม਺ͱΈͳ͢ • જࡏม਺ΛڬΜͰɺෳ਺ͷߦಈσʔλΛద੾ʹΞϥΠϝϯτ͢Δ

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©2023 Wantedly, Inc. ຊݚڀͷϞνϕʔγϣϯ ҉໧తϑΟʔυόοΫΛ׆༻ͯ͠ɺߴਫ਼౓ͳਪનΛߦ͍͍ͨ • ҉໧తϑΟʔυόοΫʢimplicit feedbackʣͷྫɿΫϦοΫɺΧʔτ΁ͷ௥Ճɺߪೖ • ໌ࣔతϑΟʔυόοΫʢexplicit feedbackʣͱҟͳΓɺ҉໧తϑΟʔυόοΫ͸ 
 σʔλΛऔಘ͠΍͘͢ɺଟ͘ͷਪનγεςϜ͸͜ΕΛ΋ͱʹֶश͞Ε͍ͯΔ ໌ࣔత ҉໧త σʔλྔ গͳ͍ ଟ͍ σʔλͷਖ਼֬͞ ਖ਼֬ ෆਖ਼֬ ະධՁͱωΨςΟ ϒͷ۠ผ ໌֬ ෆ໌֬ ʰਪનγεςϜ࣮ફೖ໳ʱhttps://www.oreilly.co.jp/books/9784873119663

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©2023 Wantedly, Inc. ຊݚڀͷϞνϕʔγϣϯ Ұൠతʹ͸ΫϦοΫσʔλ͚ͩΛ࢖͏͜ͱ͕ଟ͍ • ΫϦοΫσʔλ͸༷ʑͳ҉໧తϑΟʔυόοΫͷதͰ΋ಛʹ༰қʹೖखՄೳ • ͔͠͠ɺϊΠζ΍όΠΞε͕େ͖͘ɺਖ਼֬ͳᅂ޷ͷਪఆ͕೉͍͠

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©2023 Wantedly, Inc. ຊݚڀͷϞνϕʔγϣϯ ΫϦοΫσʔλͰ͸ͳ͘ɺߪೖσʔλ͚ͩΛར༻͢Δͷ͸ʁ • ਪનγεςϜͰϢʔβʔʹଅਐ͍ͤͨ͞ߦಈʢeίϚʔεͰ͋Ε͹ߪೖʣΛֶशʹ 
 ࢖͑ΔͷͰ͋Ε͹ɺͦΕʹӽͨ͜͠ͱ͸ͳ͍ • ͔͠͠ɺσʔλͷεύʔεੑʹىҼ͢Δ໰୊΍ίʔϧυελʔτ໰୊͕ੜ͡΍͍͢

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©2023 Wantedly, Inc. ຊݚڀͷϞνϕʔγϣϯ ෳ਺ͷछྨͷߦಈΛֶशʹར༻ͯ͠ɺͦΕͧΕͷܽ఺Λิ͍͍ͨ • ิॿతͳߦಈσʔλ(ΫϦοΫ)Λར༻͢Δ͜ͱͰɺεύʔεͳλʔήοτߦಈ(ߪೖ)ͷ 
 ༧ଌੑೳΛڧԽͤ͞Δ ΫϦοΫ ߪೖ σʔλྔ ଟ͍ গͳ͍ ϊΠζͷେ͖͞ େ͖͍ খ͍͞ ίʔϧυελʔτ ൃੜ͠ʹ͍͘ ൃੜ͠΍͍͢

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©2023 Wantedly, Inc. ղܾ͍ͨ͠՝୊ᶃ ෳ਺छྨͷߦಈσʔλ෼෍ͷؒʹ͸Ϊϟοϓ͕ଘࡏ͢Δ • ྫ͑͹ɺϢʔβʔ͕ΫϦοΫ͕ͨ͠ߪೖ͠ͳ͔ͬͨͳͲɺ֤ʑͷϊΠζʹΑͬͯੜ͡Δ • φΠʔϒʹʮߦಈͷछྨ͝ͱʹϢʔβʔͷ޷ΈΛֶशͨ͠ޙͦΕͧΕΛ૊Έ߹ΘͤΔʯ 
 ͜ͱΛͨ͠ͱͯ͠΋ɺҰ؏ͨ͠Ϣʔβʔͷਅͷᅂ޷Λਪఆ͢Δ͜ͱ͸೉ͦ͠͏

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©2023 Wantedly, Inc. ղܾ͍ͨ͠՝୊ᶄ ิॿతͳߦಈσʔλͰ͋ΔΫϦοΫσʔλͷϊΠζ͕ඇৗʹେ͖͍ • ϊΠζͷେ͖͞Λߟྀ͓͔ͯ͠ͳ͍ͱɺ͜ΕͷӨڹ͕ࢧ഑తʹͳͬͯ͠·͏

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©2023 Wantedly, Inc. ઌߦݚڀ͸Ͳ͏͍ͯͨ͠ʁ ෳ਺छྨͷߦಈΛ׆༻͢Δઌߦݚڀ͸ɺ՝୊ᶃᶄʹରԠͰ͖͍ͯͳ͍ͱओு • ߦಈͷछྨΛҟछͷϊʔυʹஔ͖׵͑ͯάϥϑͰղ͍ͨΓɺϚϧνλεΫֶशΛͨ͠Γ • σʔλ෼෍ͷΪϟοϓΛߟྀͰ͖͍ͯͳ͍ͷͰɺීวతͳᅂ޷දݱΛ࡞Ε͍ͯͳ͍ͷͰ͸ • ิॿ৘ใͷϊΠζͷେ͖͞ΛߟྀͰ͖͍ͯͳ͍ͷͰɺޮՌతͳิॿʹ͸ͳ͍ͬͯͳ͍ͷͰ͸

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©2023 Wantedly, Inc. ຊݚڀͰࢧ͍࣋ͨ͠Ծઆ ෳ਺छྨ͋Δߦಈ͸ͦΕͧΕϢʔβʔͷਅͷᅂ޷ʹج͍͍ͮͯΔ ਅͷᅂ޷෼෍ P(R_t) ΫϦοΫ෼෍ P(R_g) ߪೖ෼෍ P(R_f) ʴϊΠζͳͲ ʴϊΠζͳͲ

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©2023 Wantedly, Inc. Ծઆʹج͍ͮͨख๏ͷఏҊ જࡏม਺(ਅͷᅂ޷)ΛڬΜͰɺෳ਺छྨͷߦಈσʔλ෼෍ΛΞϥΠϝϯτ͢Δ • ਅͷᅂ޷෼෍Λֶशͯ͠ਪ࿦ʹ࢖͏ • ֤ߦಈσʔλ෼෍ͱͷؒͷKL-divͷ࠷খԽͱ֤ߦಈσʔλ෼෍ͷ໬౓࠷େԽΛ໨ࢦ͢ ֶशɿ ਪ࿦ɿ ਪ࿦࣌ʹP(R_f)Λ࢖͍ͬͯΔͷ͸ܦݧతʹྑ͔͔ͬͨΒ

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©2023 Wantedly, Inc. ֶश࣌ͷ޻෉ ֶश҆ఆੑΛߴ͘͢ΔͨΊʹKL-divͷܭࢉͰ͸ࣄલֶशࡁΈϞσϧΛ࢖͏ • ࣄલʹߦಈͷछྨ͝ͱʹϞσϧΛֶश͓ͤͯ͘͞ ੺࿮ͷՕॴҎ֎ͷϞσϧֶ͕शର৅

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©2023 Wantedly, Inc. ࣮ݧઃܭ ࣮ݧͰݕূ͍ͨ͜͠ͱ͸ʁ(RQ) • ఏҊख๏ͷੑೳ͸طଘͷෳ਺ߦಈϞσϧΑΓ΋޲্͍ͯ͠Δ͔ʁ • ఏҊख๏ͷੑೳ͸طଘͷσϊΠδϯάख๏ΑΓ΋޲্͍ͯ͠Δ͔ʁ

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©2023 Wantedly, Inc. ࣮ݧઃܭ ઃܭ߲໨ • σʔληοτɿECαʔϏεͷΦʔϓϯσʔλʢΫϦοΫΛิॿɺߪೖΛλʔήοτͱ͢Δʣ • ධՁࢦඪɿRecall@k ͱ NDCG@k (k=10, 20)ɺ྆ऀͱ΋஋͕ߴ͍΄Ͳྑ͍݁Ռ • ϕʔεϥΠϯɿϋΠύϥ͸ධՁσʔληοτ͝ͱʹඍௐ੔

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©2023 Wantedly, Inc. ࣮ݧ݁Ռᶃ طଘͷෳ਺ߦಈϞσϧΑΓ΋༧ଌਫ਼౓͕޲্͍ͯ͠Δ͜ͱΛ֬ೝ ୯Ұ ෳ਺

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©2023 Wantedly, Inc. ࣮ݧ݁Ռᶄ طଘͷσϊΠδϯάख๏ΑΓ΋༧ଌਫ਼౓͕޲্͍ͯ͠Δ͜ͱΛ֬ೝ ୯Ұ ୯Ұ σ ϊ Π δ ϯ ά ख ๏

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©2023 Wantedly, Inc. αϚϦʔ ෳ਺ͷߦಈ৘ใΛΞϥΠϝϯτͯ͠ਅͷᅂ޷Λਪఆ͢Δख๏ΛఏҊͨ͠࿦จ • Ϟνϕʔγϣϯɿෳ਺ͷߦಈσʔλΛֶशʹ࢖͏͜ͱͰɺ֤ߦಈσʔλͷܽ఺Λิ͍͍ͨ • ՝୊ɿ • ߦಈσʔλ෼෍ͷؒʹ͸Ϊϟοϓ͕͋Δ • औಘ͕༰қͳߦಈσʔλ΄ͲϊΠζ͕େ͖͍ • ղܾํ๏ɿ • Ϣʔβʔͷਅͷᅂ޷Λજࡏม਺ͱ͠ɺͦΕʹج͍ͮͨߦಈ݁Ռ͕؍ଌม਺ͱΈͳ͢ • જࡏม਺ΛڬΜͰɺෳ਺ͷߦಈσʔλΛద੾ʹΞϥΠϝϯτ͢Δ