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© 2024 Wantedly, Inc. Wantedly ʹ͓͚ΔϚονϯάମݧΛ ࠷େԽͤ͞ΔͨΊͷਪનγεςϜ Jan. 17 2024 - Shuhei Goda Recommendation Industry Talks #1

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© 2024 Wantedly, Inc. ͸͡Ίʹ

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© 2024 Wantedly, Inc. ໊લɿ 
 ߹ా पฏ(Shuhei Goda) ॴଐͱ໾ׂɿ 
 ɾ΢ΥϯςουϦʔגࣜձࣾ(2019~) 
 ɾਪનνʔϜϦʔμʔ 
 ɾML Tech Lead & Product Manager 
 
 Kaggle Tierɿ 
 Kaggle Competitions Grandmaster @jy_msc ࣗݾ঺հ

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© 2024 Wantedly, Inc. ϓϥοτϑΥʔϜͰͷϚονϯάΛੜΈग़͢ਪનγεςϜ ● ͳͥϚονϯάʹਪનγεςϜ͕ඞཁͳͷ͔ ● Ϛονϯάʹ͸Ͳ͏͍͏ਪન͕ඞཁͳͷ͔ ● Ͳ͏͍͏͜ͱ͕ٕज़త՝୊ͳͷ͔ ࠓճ͓࿩͍ͨ͜͠ͱ

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© 2024 Wantedly, Inc. ձࣾɾαʔϏεͷ঺հ

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©2024 Wantedly, Inc. ڀۃͷదࡐదॴʹΑΓɺ 
 γΰτͰίίϩΦυϧͻͱΛ;΍͢ ࢲͨͪͷϛογϣϯ ©2024 Wantedly, Inc.

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© 2024 Wantedly, Inc. iOS, Android and Web ؾܰʹձࣾ๚໰ ϛογϣϯ΍Ձ஋؍΁ͷڞײͰϚονϯά ● څ༩΍෱རްੜͳͲͷ৚݅Ͱ͸ͳ͘ɺ૝͍͕͋Ε͹ձࣾͷ ن໛ʹͱΒΘΕͳ͍ ·ͣʮ࿩Λฉ͖ʹߦ͘ʯͱ͍͏৽͍͠ମݧ ● ݸਓͱاۀ͕ϑϥοτͳ໨ઢͰग़ձ͑Δ͜ͱͰɺΑΓັྗ తͳ৔ॴΛݟ͚ͭΔ͜ͱ͕Մೳʹ ձࣾ๚໰ΞϓϦʮWantedly Visitʯ

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© 2024 Wantedly, Inc. ϓϥοτϑΥʔϜߏ଄

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© 2024 Wantedly, Inc. ● Ϣʔβʔɿࣗ਎͕׆༂Ͱ͖Δ࢓ࣄʹग़ձ͑Δ ● اۀɿࣗࣾͰ׆༂Ͱ͖Δਓࡐʹग़ձ͑Δ Ϛονϯάͱ͍͏ίΞମݧ Visit ʹ͓͚Δ੒௕Ϟσϧʢུ֓ʣ αʔϏεͷ੒௕ʹ͸ɺ଺Γͳ͘ 
 Ϛονϯά͕૿͑Δ͜ͱ͕ॏཁ

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© 2024 Wantedly, Inc. ͳͥϚονϯάʹਪનγεςϜ͕ඞཁͳͷ͔

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© 2024 Wantedly, Inc. ϚονϯάମݧͷϞσϧԽ Ϣʔβʔ اۀ 1. ίϯςϯπͷӾཡ 2. Ԡื 3. ϝοηʔδฦ৴ p(match = 1|u, c) = p(exam = 1|u, c) × p(apply = 1|u, c, exam = 1) × p(reply = 1|u, c, apply = 1) Ϣʔβʔ͸ͲͷاۀΛݟΔ͔ Ϣʔβʔʹͱͬͯ 
 اۀͷίϯςϯπ͸ັྗత͔ اۀʹͱͬͯ 
 ϢʔβʔͷϓϩϑΟʔϧ͸ັྗత͔ ※ຊൃද༻ʹ؆қԽ

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© 2024 Wantedly, Inc. αʔϏεͷ֦େʹ൐ͬͯັྗతͳاۀΛݟ͚ͭΔ͜ͱ͕ࠔ೉ʹ ● Ϣʔβʔ΍اۀͷ਺͕େ͖͘૿Ճ ● Ϣʔβʔ΍اۀͷଐੑ΍ᅂ޷ੑ͕ଟ༷Խ αʔϏεͷϑΣʔζ͕ਐΉதͰݦࡏԽ͢Δ՝୊ p(exam = 1|u, c) × p(apply = 1|u, c, exam = 1) × p(reply = 1|u, c, apply = 1) Ϣʔβʔ͸ͲͷاۀΛݟΔ͔ Ϣʔβʔʹͱͬͯ 
 اۀͷίϯςϯπ͸ັྗత͔ اۀʹͱͬͯ 
 Ϣʔβʔͷίϯςϯπ͸ັྗత͔ ͕͜͜େ͖ͳϘτϧωοΫʹ αʔϏε಺ͷෳࡶ౓͕૿͍ͯ͘͠ 
 ͜ͱʹΑΔϛεϚονͷ૿Ճ

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© 2024 Wantedly, Inc. ਪનٕज़Λ׆༻͢Δ͜ͱͰϚονϯάΛੜΈग़͢ ● ͲͷϢʔβʔʹͲ͏͍͏اۀΛදࣔ͢Δͷ͔ ● ͲͷاۀʹͲ͏͍͏ϢʔβʔΛදࣔ͢Δͷ͔ දࣔΛ੍ޚ͢ΔͨΊͷιϦϡʔγϣϯ p(exam = 1|u, c, rec) × p(apply = 1|u, c, exam = 1) × p(reply = 1|u, c, apply = 1) Ϣʔβʔ͸ͲͷاۀΛݟΔ͔ Ϣʔβʔʹͱͬͯ 
 اۀͷίϯςϯπ͸ັྗత͔ اۀʹͱͬͯ 
 Ϣʔβʔͷίϯςϯπ͸ັྗత͔ ͜͜Λ੍ޚ͢Δ p(match = 1|u, c, rec) =

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© 2024 Wantedly, Inc. Ϛονϯάʹ͸Ͳ͏͍͏ਪન͕ඞཁͳͷ͔

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© 2024 Wantedly, Inc. Ϛονϯάͷਪનͷ੒ޭɾࣦഊ Ϣʔβʔ اۀ 1. Ԡื 2. ϝοηʔδฦ৴ ੒ޭ Ϣʔβʔ اۀ 1. Ԡื ʢϝοηʔδฦ৴ͳ͠ʣ ࣦഊ

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© 2024 Wantedly, Inc. ૬ޓਪનγεςϜʢReciprocal Recommender Systemsʣ αʔϏε಺ͷϢʔβʔΛޓ͍ʹਪન͠߹͏γεςϜ ● ਪનΛड͚औΔϢʔβʔͱਪન͞ΕͨϢʔβʔͷ྆ํ͕ຬ଍ͯ͠੒ޭ ● ਪનΛड͚औΔϢʔβʔ͕ຬ଍͢Ε͹੒ޭ͢Δ item-to-user ਪનͱ͸ 
 ੒ޭͷج४͕ҟͳΔ item-to-user ਪનͷ੒ޭ Ϣʔβʔ ΞΠςϜ ૬ޓਪનͷ੒ޭ ߪೖ Ԡื ฦ৴ Ϣʔβʔ اۀ ฦ৴ εΧ΢τ Ϣʔβʔ اۀ

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© 2024 Wantedly, Inc. 1. ϢʔβʔA→ϢʔβʔBͱɺϢʔβʔB→ϢʔβʔAͷ Preference Score Λਪ࿦ 2. ૬ޓͷ Preference Score Λू໿͢Δ ૬ޓਪનͷجຊతͳΞʔΩςΫνϟ User A to User B Preference Score User B to User A Preference Score Reciprocal Preference Score Aggregation Function ू໿ؔ਺͸ྫ͑͹ࢉज़ฏۉɺزԿฏۉɺௐ࿨ฏۉͳͲ 
 ྆ํͱ΋είΞ͕ߴ͚Ε͹ߴ͘ɺͲͪΒ͔௿͍ͱ௿͘ͳΔ 
 ੑ࣭Λ࣋ͭؔ਺͕ద੾ͱݴΘΕ͍ͯΔ ௐ࿨ฏۉ ࢉज़ฏۉ

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© 2024 Wantedly, Inc. ࣄྫ঺հ

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© 2024 Wantedly, Inc. Item-to-user ਪનΛ࠾༻͍ͯͨ࣌͠ظ͕͋ͬͨ ● ඃਪનϢʔβʔͷຬ଍౓Λఆٛͯ͠ద߹౓Λઃܭ͠ɺͦΕΛ࠷దԽ ͔ͭͯͷԠืͱεΧ΢τͷਪનʹ͍ͭͯ Ϣʔβʔ اۀ ԠืλεΫ εΧ΢τλεΫ اۀ Ϣʔβʔ ྫ͑͹ɺ 
 ɾϚονϯά=2 
 ɾϚονϯά੒ཱ͠ͳ͔ͬͨԠื=1 
 ɾԠื͠ͳ͍=0 ྫ͑͹ɺ 
 ɾϚονϯά=2 
 ɾϚονϯά੒ཱ͠ͳ͔ͬͨεΧ΢τ=1 
 ɾεΧ΢τ͠ͳ͍=0

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© 2024 Wantedly, Inc. ● ద߹౓͸ਓखͰઃఆ͍ͯ͠Δ͜ͱͰϚονϯά࠷దԽ͕ࠔ೉ʹ ● Ϛονϯά੒ཱͨ͠ΞΠςϜ͸ɺϚονϯά੒ཱ͠ͳ͍͚ͲԠืͨ͠ 
 ΞΠςϜͷ2ഒຬ଍ͱ͢ΔɻͳΜͰ4ഒ͸ବ໨ʁ ● Ϟσϧ಺Ͱಛ௃ྔ͕ҙਤ௨Γʹ༗ޮతʹ࢖ΘΕͳ͍ ● ϚονϯάʹࢸΔ·Ͱͷεςοϓຖʹಉ͡ಛ௃ྔͰ΋ར༻ҙਤ͸ҟͳΔ ● ϚονϯάϞσϧΛ1ͭͷϞσϧʹԡ͠ࠐΊ͍ͯΔ Item-to-user ਪનͷ՝୊ ※ϓϩμΫτ՝୊͸ࠓճ৮Εͳ͍ Ϣʔβʔ اۀ 1. ίϯςϯπͷӾཡ 2. Ԡื 3. ϝοηʔδฦ৴ User to Company Preference Model ద߹౓

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© 2024 Wantedly, Inc. Item-to-user ਪન͔Β૬ޓਪન΁ ● ԠืͱεΧ΢τͱ΋ʹओཁKPI͕େ͖͘৳ͼͨ 🎉🎉🎉 ԠืͱεΧ΢τͷਪનվળΛ࣮ࢪ User to Company Preference Model User to Company Preference Model Company to User Preference Model Aggregation Function

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© 2024 Wantedly, Inc. ղܾ͢Δ΂͖ٕज़త՝୊ ※Ұ෦Λൈਮ

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© 2024 Wantedly, Inc. Ұ෦ͷϢʔβʔ͕ਪન͞ΕΔػձ͕ଟ͘ͳΓूதͯ͠͠·͏ ● Ϣʔβʔͱاۀ͸ͦΕͧΕΩϟύγςΟΛ༗͢Δ ● φΠʔϒͳ૬ޓਪન͸શମ࠷దΛ࣮ݱͰ͖͍ͯͳ͍ LIKEͷूத શһରԠ͢Δͷ͸ 
 ࣌ؒతʹϜϦ… Ԡืདྷͳ͍…

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© 2024 Wantedly, Inc. ᅂ޷༧ଌ͠΍͍͢Ϣʔβʔͱͦ͏Ͱͳ͍Ϣʔβʔ͕͍Δ ● ೳಈతʹߦಈ͢ΔϢʔβʔ΋͍Ε͹ɺLIKE͕ૹΒΕΔ͜ͱΛ଴͍ͬͯΔ डಈతͳϢʔβʔ΋͍Δʢྫ͑͹ɺεΧ΢τ଴ͪͷϢʔβʔʣ ● ͨ͘͞ΜԠื͢ΔೳಈతͳϢʔβʔͷ΄͏͕ͨ͘͞Μ৘ใ͕͋ΔͷͰɺ ࣭ͷߴ͍ਪન͕Մೳ ● ٯʹɺडಈతͳϢʔβʔ͸͍ͬͨΜεΧ΢τΛड͚औΒͳ͍ݶΓɺৄࡉ ͳᅂ޷͸෼͔Βͳ͍ ݸʑͷᅂ޷༧ଌਫ਼౓ͷࠩҟ

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© 2024 Wantedly, Inc. ● ू໿ػߏɾू໿ػߏҎ߱ͷϓϩηεͷվળɺ·ͨ͸ΞʔΩςΫνϟҰ৽ ● Ϣʔβʔ͕αʔϏε্Ͱ༷ࣔ͢ʑͳछྨͷᅂ޷ͷ౷߹ ● ίϯςϯπͷྔɾ࣭ͷڧԽͱ׆༻ɿʮڞײʯʹՃ͑ͯʮεΩϧʯ໘Ͱ΋ Ϛον͢Δग़ձ͍ͷ૑ग़ Ͳ͏ղܾʹ޲͔͏͔ 2023೥12݄ʹεΩϧ਍அΛϦϦʔε

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© 2024 Wantedly, Inc. ͍͞͝ʹ

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© 2024 Wantedly, Inc. ΋ͬͱ࿩ฉ͖͍ͨͱࢥͬͨํ͸ΧδϡΞϧ໘ஊ͠·͠ΐ͏ʂ ΧδϡΞϧ໘ஊϖʔδ ߹ాͷXΞΧ΢ϯτͰDM͍ͩ͘͞