論文紹介 / Leveraging Meta-path based Context for Top-N Recommendation with A Neural Co-Attention Model

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-FWFSBHJOH.FUBQBUICBTFE $POUFYUGPS5PQ/3FDPNNFOEBUJPO XJUI"/FVSBM$P"UUFOUJPO.PEFM ,%%` #JOCJO )V $IVBO 4IJ 8BZOF9JO;IBP 1IJMJQ4:V ࿦จ঺հ !LVSJJWF

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໨࣍ ݚڀ֓ཁ ݚڀഎܠ ఏҊख๏ ࣮ূ࣮ݧ ·ͱΊ

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໨త 5PQ/ਪનͷ࣭ͷ޲্ ख๏ 1SJPSJUZCBTFE3BOEPN8BMLʹΑΓ$POUFYUͷ෼ࢄදݱΛੜ੒ $P"UUFOUJPOػߏʹΑΓ6TFS *UFN $POUFYUͷ෼ࢄදݱΛվྑ ݁Ռ ਪનͷ࣭ͱղऍੑͷ޲্ ݚڀ֓ཁ

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໨࣍ ݚڀ֓ཁ ݚڀഎܠ ఏҊख๏ ࣮ূ࣮ݧ ·ͱΊ

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ݚڀഎܠʛ5PQ/ਪન ϢʔβʔʹΦεεϝͷΞΠςϜΛਪન ྫʣөըɺΞʔςΟετɺϨετϥϯʜ ͋ͳͨʹΦεεϝʓʓ ˚˚˚˚˚˚˚ ˘˘˘˘˘ ˕˕˕˕˕˕˕ ººººººººº

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ݚڀഎܠʛਪનγεςϜ ਪનγεςϜ͸ ༷ʑͳαʔϏεͰ த৺తͳ໾ׂ<> ݹయతख๏ͱͯ͠ ߦྻ෼ղ<>ͳͲ

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ݚڀഎܠʛ$POUFYU׆༻ ࠓ೔ɺଟ༷ͳ$POUFYU σʔλ͕ར༻Մೳʹ ݕࡧཤྺɺҐஔ৘ใͳͲ $POUFYUΛ׆༻ͨ͠ ਪનख๏ͷొ৔< >

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ݚڀഎܠʛ)FUFSPHFOFPVT*OGPSNBUJPO/FUXPSL )*/ ෳ਺छྨͷϊʔυ΍ ΤοδΛ࣋ͭάϥϑ ଟ༷ͳσʔλΛ ॊೈʹϞσϧԽՄೳ

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ݚڀഎܠʛ.FUBQBUI<> ϝλϨϕϧͰ QBUIΛ੍ޚ ྨࣅݕࡧͰ ໨֮·͍͠੒Ռ

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ݚڀഎܠʛஶऀʹΑΔ.FUBQBUIԠ༻ͷઌߦݚڀ<> .FUBQBUIͰ ϢʔβʔΞΠςϜΛ ຒΊࠐΉ ධՁ༧ଌʹ͓͍ͯ 405"

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ݚڀഎܠʛஶऀ͸͜͏ࢥͬͨᶃ ϝλύεͰγʔέϯεΛ ੜ੒͢Δͱ͖ ભҠ͕ϥϯμϜͳͷ͸ ݱ࣮తͰͳ͍ͷͰ͸ʁ ࣄલʹྨࣅ౓ܭࢉͯ͠ ༏ઌ౓͚ͭΑ͏ʂ

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ݚڀഎܠʛஶऀ͸͜͏ࢥͬͨᶄ طଘख๏ɺ ϢʔβʔͱΞΠςϜͷ ྨࣅ౓͔͠ݟͯͳ͍ΑͶʁ $POUFYU΋ຒΊࠐΜͰ ؔ܎ੑΛ൓өͤ͞Α͏ʂ

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ݚڀഎܠʛஶऀ͸͜͏ࢥͬͨᶅ ΞΠςϜ͕ ਪન͞ΕΔཧ༝ͬͯ ͦΕͧΕҧ͏ΑͶʁ $POUFYUͷຒΊࠐΈʹ ॏཁ౓Λ͚ͭΑ͏ʂ

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໨࣍ ݚڀ֓ཁ ݚڀഎܠ ఏҊख๏ ࣮ূ࣮ݧ ·ͱΊ

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ఏҊख๏ʛλεΫఆٛ )*/͕༩͑ΒΕͨͱ͖ɺ Ϣʔβʔʹͱͬͯ ڵຯਂ͍ΞΠςϜϦετͷਪન ͋ͳͨʹΦεεϝʓʓ ˚˚˚˚˚˚˚ ˘˘˘˘˘ ˕˕˕˕˕˕˕ ººººººººº

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ఏҊख๏ʛ$POUFYUຒΊࠐΈΛ༻͍Δҙਤ Ϣʔβʔ͕ΞΠςϜΛબͿͱ͖ɺͦ͜ʹ͸͍ΖΜͳจ຺͕ଘࡏ ʢྫɿ޷͖ͳδϟϯϧͷ΋ͷͩͬͨɺ༑ୡ͕Φεεϝͯͨ͠ʣ ˣ ྲྀߦΓͷөըʹඈͼ͖͕ͭͪͳਓɺ ಛࡱ޷͖ͷਓʹΑ͘ݟΒΕΔөըɺ ͱ͍ͬͨ৘ใ͕)*/ʹ಺ࡏ͍ͯ͠ΔɺͱԾఆ ˣ ͦ͏͍ͬͨؔ܎Λ൓өͨ͠ਪનΛ͍ͨ͠

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ఏҊख๏ʛ֓ཁ ᶃ)*/্Ͱ1SJPSJUZCBTFE3BOEPN8BML ᶄ6TFS *UFN $POUFYUͷ&NCFEEJOHܭࢉ ᶅ$P"UUFOUJPOػߏΛ༻͍ͯվྑ ᶆ݁߹

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ఏҊख๏ʛ֓ཁ ᶃ)*/্Ͱ1SJPSJUZCBTFE3BOEPN8BML

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ఏҊख๏ʛ1SJPSJUZCBTFE3BOEPN8BMLͷҙਤ ϢʔβʔͱΞΠςϜͷؔ܎Λ ΑΓਖ਼֬ʹදݱ͍ͨ͠

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ఏҊख๏ʛ 1SJPSJUZCBTFE3BOEPN8BML ࣍ʹભҠ͢Δϊʔυ͸.FUBQBUIʹԊ͍ͬͯΔதͰ 47%'FBUVSF<> Ͱࣄલʹࢉग़ͨ͠ྨࣅ౓Ͱܾఆ ʢطଘख๏Ͱ͸ϥϯμϜʣ ྫʣV ͔ΒN N ͷͲͪΒʹભҠ͢Δ͔͸ྨࣅ౓࣍ୈ

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ఏҊख๏ʛ֓ཁ ᶄ6TFS *UFN $POUFYUͷ&NCFEEJOHܭࢉ

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ఏҊख๏ʛ6TFS *UFN&NCFEEJOH Ϣʔβʔ ͷ&NCFEEJOH ɺ ΞΠςϜ ͷ&NCFEEJOH ͸ 47%'FBUVSF<> Ͱੜ੒ͨ͠&NCFEEJOHΛͦͷ··༻͍Δ

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ఏҊख๏ʛ$POUFYU &NCFEEJOHͷҙਤ ϢʔβʔͱΞΠςϜͷؔ܎ΛϞσϧʹ૊ΈࠐΈ͍ͨ

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ఏҊख๏ʛ$POUFYU&NCFEEJOH ᾇͭͷQBUIΠϯελϯεΛຒΊࠐΉ ᾈᾇΛू໿ͯͭ͠ͷ.FUBQBUIΛຒΊࠐΉ

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ఏҊख๏ʛᾇͭͷQBUIΠϯελϯεΛຒΊࠐΉ .FUBQBUIʹैͬͯQBUIΠϯελϯε ͕༩͑ΒΕͨͱ͖ɺ Λߏ੒͢Δ֤ϊʔυͷ&NCFEEJOHΛ࿈݁ͨ͠ߦྻ ʹର͠ɺ ͷ&NCFEEJOH͸ ℎ = ( ; Θ) ʢΘ͸$//ͷύϥϝʔλʔʣ

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ఏҊख๏ʛᾈᾇΛू໿ͯͭ͠ͷ.FUBQBUIΛຒΊࠐΉ &NCFEEJOHℎ ͕ݸੜ੒͞Εͨͱ͖ɺ {ℎ }456 7 Λͦͷू߹ͱ͢Δͱ.FUBQBUIͷ&NCFEEJOH͸ 9 = max−( ℎ 456 7 )

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ఏҊख๏ʛ֓ཁ ᶅ$P"UUFOUJPOػߏΛ༻͍ͯվྑ

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ఏҊख๏ʛ$P"UUFOUJPO ᾇ"UUFOUJPOGPS.FUBQBUICBTFE$POUFYU ᾈ"UUFOUJPOGPS6TFSTBOE*UFNT

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ఏҊख๏ʛҙਤᾇ ෳ਺͋Δ.FUBQBUIͷ͏ͪɺ ϢʔβʔͱΞΠςϜͷؔ܎Λద੾ʹઆ໌͢Δ.FUBQBUIΛ ΑΓڧ͘൓өͨ͠$POUFYUʹ͍ͨ͠

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ఏҊख๏ʛᾇ"UUFOUJPOGPS.FUBQBUICBTFE$POUFYU Ϣʔβʔ ͱΞΠςϜʹͱͬͯ.FUBQBUI ͷॏཁ౓Λܭࢉ ˣ ॏཁ౓Λ$POUFYU&NCFEEJOHB→D ʹ൓ө ʢྫɿB→D = 0.5 HIJI + 0.2 HIHI + 0.1 HIJI + ⋯ʣ

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ఏҊख๏ʛҙਤᾈ $POUFYU&NCFEEJOHΛ༻͍ͯ Ͳ͏͍͏จ຺ͰΞΠςϜΛબͿϢʔβʔͳͷ͔ɺ Ͳ͏͍͏จ຺Ͱબ͹Ε΍͍͢ΞΠςϜͳͷ͔Λ൓ө͍ͨ͠

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ఏҊख๏ʛᾈ"UUFOUJPOGPS6TFSTBOE*UFNT FMFNFOUXJTFੵʹΑΓ B→D ͷ&NCFEEJOHΛ൓ө ˣ B ʹ൓өͨ͠ OB ɺD ʹ൓өͨ͠ OD ͕ ࠷ऴతͳ6TFS *UFN&NCFEEJOH

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ఏҊख๏ʛ֓ཁ ᶆ݁߹

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ఏҊख๏ʛᶆ݁߹ ϕΫτϧ࿈݁ૢ࡞Λ⊕ͱͯ͠ɺ OB,D = OB ⊕ B→D ⊕ OD ̂B,D = ( OB,D )

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໨࣍ ݚڀ֓ཁ ݚڀഎܠ ఏҊख๏ ࣮ূ࣮ݧ ·ͱΊ

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࣮ূ࣮ݧʛσʔληοτ .PWJFMFOT өըϨϏϡʔαΠτ -BTU'. Իָ4/4 :FMQ ΫνίϛαΠτ

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/FV.'<> 5PQ/ਪનͰ 405"ͳख๏ ڠௐ ϑΟϧλϦϯά ϕʔε ࣮ূ࣮ݧʛ୅දతͳൺֱख๏ͭͱఏҊख๏ '.(SBOL <> ධՁ༧ଌͰ 405"ͳख๏ ʢ5PQ/ਪન༻ ʹमਖ਼ʣ ߦྻ෼ղϕʔε .$3FD ᾇ1SJPSJUZCBTFE 3BOEPN8BML ͳ͠ ᾈ$P"UUFOUJPO ͳ͠ ᾉ6TFS *UFN "UUFOUJPO ͳ͠ .$3FD ׬શ൛

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࣮ূ࣮ݧʛ݁Ռ .$3FD͕Ұ؏ͯ͠༏Ε͍ͯΔ ˣ ఏҊख๏ͷ༗ޮੑ

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࣮ূ࣮ݧʛ$PMETUBSUਪન ܇࿅σʔλྔΛม͑ͯ #13<>͔Βͷվળ཰Λܭଌ ˣ ఏҊख๏.$3FD͸$PMETUBSUͰ΋ڧ͍

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࣮ূ࣮ݧʛਪન݁Ռղऍੑͷఆੑ෼ੳ 6.6.΍666.ͷ"UUFOUJPO 4DPSFେˠෳ਺ͷ༑ਓ͕ࢹௌࡁͩͬͨ 6.(.ͷ"UUFOUJPO 4DPSFେˠ޷͖ͳδϟϯϧͩͬͨ ˣ ͦͷΞΠςϜ͕ਪન͞Εͨཧ༝͸ "UUFOUJPO 4DPSF͕ߴ͍.FUBQBUIΛݟΕ͹Θ͔Δ

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࣮ূ࣮ݧʛ"UUFOUJPO4DPSFͷ෼෍ ଞͷ.FUBQBUIΑΓ ॏཁͳ.FUBQBUI͕ଘࡏ

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໨࣍ ݚڀ֓ཁ ݚڀഎܠ ఏҊख๏ ࣮ূ࣮ݧ ·ͱΊ

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໨త 5PQ/ਪનͷ࣭ͷ޲্ ख๏ 1SJPSJUZCBTFE3BOEPN8BMLʹΑΓ$POUFYUͷ෼ࢄදݱΛੜ੒ $P"UUFOUJPOػߏʹΑΓ6TFS *UFN $POUFYUͷ෼ࢄදݱΛվྑ ݁Ռ ਪનͷ࣭ͱղऍੑͷ޲্ ·ͱΊ