論文紹介 Balancing Relevance and Discovery to Inspire Customers in the IKEA App

࿦จ঺հ #BMBODJOH3FMFWBODFBOE%JTDPWFSZ UP*OTQJSF$VTUPNFSTJOUIF*,&""QQ 3FD4ZT࿦จಡΈձ ੢ྛ޹ !IBHJOP

"CPVUNF ✦ 4PGUXBSF&OHJOFFSBU70:"(&(3061 ✦ ޿ࠂ഑৴ϓϩμΫτͷ։ൃΛ͍ͯ͠·͢ ✦ 3FD4ZTॳࢀՃ ✦ 5XJUUFS!IBHJOP

঺հ͢Δ࿦จ

಺༰ ✦ *,&"ΞϓϦͷ*OTQJSBUJPOBM'FFEʹ͓͚ΔϦίϝϯυํࡦʹ#BOEJU 'FFECBDLϩά࢖ͬͨϙϦγʔֶशΞϓϩʔνΛద༻ͨ͠ ✦ Ϣʔβʔ͕ΠϯεϐϨʔγϣϯΛಘΒΕΔ༷ʹDPVOUFSGBDUVBMSJTL NJOJNJ[BUJPOQSJODJQMF<>ʹج͍ͮͯํࡦΛֶशͨ͠ ✦ "#ςετͷ݁ՌɺڠௐϑΟϧλϦϯάʹΑΔํࡦͱൺֱͯ͠ΫϦοΫ཰ ্͕ঢͨ͠
✦ ϖʔύʔʹ͸ଛࣦؔ਺΋࣮ݧ݁Ռ΋΄ͱΜͲॻ͍ͯͳ͔ͬͨͷͰɺ͜ͷൃ ද͸ޱ಄ൃද಺༰Λ࢖ͬͯิ׬͍ͯ͠·͢

*OTQJSBUJPOBM'FFE ✦ Ϣʔβʔ͸༷ʑͳ෦԰ͷλΠϓʹ͋ΘͤͯՈ۩͕ ഑ஔ͞ΕͨΠϝʔδ͕ӾཡͰ͖Δ ✦ ͜ͷϑΟʔυ͸Ϣʔβʔʹؔ࿈͕͋ΓΠϯεϐ ϨʔγϣϯΛ༩͑Δ΋ͷʹ͍ͨ͠ɻڻ͖ͷཁૉ͕ ٻΊΒΕΔɻ 3FMFWBODFBOE%JTDPWFSZUP*OTQJSF
✦ ؔ࿈ੑʹಛԽͨ͠Ϧίϝϯυػೳ͸طʹ͋Δ

$POUFYUVBMCBOEJUTXJUICBUDIMFBSOJOHGSPN MPHHFECBOEJUGFFECBDL ✦ Ͳͷը૾Λදࣔ͢Δ͔ ✦ $POUFYUVBM#BOEJUTͰܾΊΔ ✦ $POUFYUVBM#BOEJUTͷߦಈબ୒ϙϦγʔͷֶश ✦ όονͰ΍Δ
㱠ΦϯϥΠϯֶश ✦ #BOEJU'FFECBDLϩάΛ࢖ͬͯ܇࿅ ✦ CBTFEPOUIFQSJODJQMFPGDPVOUFSGBDUVBMSJTLNJOJNJ[BUJPO<> ✦ $PVOUFSGBDUVBM-FBSOJOH

✦ ߦಈ ✦ ը૾Λબ୒ͯ͠දࣔ͢Δࣄ ✦ ใु ✦ දࣔͨ͠ը૾͕ΫϦοΫ͞ΕΔ͔Ͳ͏͔㱨\ ^ ✦
ίϯςΩετ ✦ ΞϓϦ্ͷϢʔβʔࣗ਎ͷաڈͷ;Δ·͍ *OTQJSBUJPOBM'FFEͷ#BOEJUઃఆ

$POUFYUVBMCBOEJUT ܁Γฦ͠ҙࢥܾఆ໰୊ʹ͓͍ͯྦྷੵใुͷ࠷େԽΛૂ͏ํࡦͷͳ͔Ͱ΋ ϥ΢ϯυຖͷίϯςΩετ৘ใΛར༻ͯ͠ٻΊͨείΞʹैͬͯߦಈΛબ୒͢ Δ΋ͷɻ؍ଌͨ͠ใुΛ࢖ͬͯείΞϦϯάϞσϧΛߋ৽͍ͯ͘͠ɻ είΞϦϯάϞσϧʹઢܗϞσϧΛ࠾༻ͨ͠-JO6$#<>ͳͲɺ༷ʑͳํࡦ͕ఏҊ͞Ε͍ͯΔ

ࢀߟ-JO6$#<> ϥ΢ϯυUʹ͓͚ΔߦಈBͷ είΞใुͷظ଴஋ ඪ४ภࠩºЋ είΞ͕࠷େͷߦಈΛ࣮ߦ ύϥϝʔλߋ৽

#BUDIMFBSOJOHGSPNMPHHFECBOEJUGFFECBDL ✦ CBOEJUGFFECBDLϩάΛ࢖ֶͬͨश ✦ աڈͷߦಈબ୒ϙϦγʔʹΑΔόΠΞεͷิਖ਼͕ඞཁ ✦ ਪનγεςϜͷϩά͸جຊతʹCBOEJUGFFECBDL ✦ ΦϯϥΠϯֶशͰ͸ͳ͍ཧ༝͸ಛʹઆ໌͕ແ͔͕ͬͨ ✦
ϦΫΤετྔ͕ଟ͍αʔϏεͰόϯσΟοτΞϧΰϦζϜΛ࢖͏৔߹͸ ࿦จͷखଓ͖௨ΓʹύϥϝʔλΛஞ࣍ߋ৽͢Δέʔε͸গͳ͍ͱࢥ͏ ✦ ΦϯϥΠϯֶश͸ӡ༻͕େม

ิ଍#BOEJU'FFECBDLϩάΛ࢖ֶͬͨश ✦ #BOEJU'FFECBDLϩάΛར༻ͨ͠৽͍͠ߦಈબ୒ϙϦγʔͷੑೳධՁΛߦͳ͏ ख๏͸ଘࡏ͢Δ ˠ0⒎1PMJDZ&WBMVBUJPO *OWFSTF1SPQFOTJUZ4DPSJOH %PVCMZ3PCVTU ʜ ✦
ੑೳධՁ஋͕࠷େʹͳΔ༷ʹߦಈબ୒ϙϦγʔΛֶश͢Ε͹ྑ͍ ✦ ߦಈΛBɺίϯςΩετΛYɺใुΛSͱͯ͠*14ͰධՁ͢Δ৔߹͸ КOFXͷ*14$PVOUFSGBDUVBM&TUJNBUPS

ߦಈબ୒ϙϦγʔͷֶश ϙϦγʔК͕ίϯςΩετYʹରͯ͠ߦಈZΛબͿ֬཰ ܏޲είΞ ΛК ZcY ใुΛЎͱ͓͘ɻաڈͷϙϦγʔКͷ܏޲είΞͱ؍ଌͨ͠ใुΛར༻ͯ͠ɺ৽ͨͳ ϙϦγʔКВΛֶश͢Δ ޱ಄ൃදεϥΠυ͔Βഈआ ͜ͷ··Ͱ͸෼ࢄͷ໰୊͕ग़ΔͷͰɺ<>Λࢀߟʹ͍͔ͭ͘ͷ޻෉ΛऔΓ͍Ε͍ͯΔͱͷઆ
໌͕͋ͬͨ

ଛࣦؔ਺ͷ௚ײతͳղऍ ใु͕ಘΒΕͨߦಈͰಛʹաڈͷϙϦγʔͷ܏޲είΞ͕௿͍ߦಈͷ܏޲είΞ্͕ ͕Ε͹ϩε͕Լ͕Δɻͭ·Γ͋·Γબ୒͠ͳ͔͕ͬͨΫϦοΫ͕ಘΒΕͨߦಈΛଟ͘ બͿ༷ʹֶश͢Δɻ ޱ಄ൃදεϥΠυ͔Βഈआ

ଛࣦؔ਺͸Ͳ͔͜Βདྷͨͷ͔ ޱ಄ൃදεϥΠυͷࣜ͸3FGFSFODFʹ͋Δ 4XBNJOBUIBOΒ$PVOUFSGBDUVBMSJTL NJOJNJ[BUJPO-FBSOJOHGSPNMPHHFECBOEJU GFFECBDLz *$.- <>ʹ͓͚ΔఏҊख๏ ͷಋग़ͷং൫ʹ͋Δ*14ϕʔεͷࣜɻ ͳͷͰ࣮ࡍʹ࢖͍ͬͯΔ
ͷ͸<>ͷఏҊख๏ͷࣜ ͩͱࢥΘΕΔ

$PVOUFSGBDUVBMSJTLNJOJNJ[BUJPO-FBSOJOHGSPNMPHHFE CBOEJUGFFECBDL *$.- <> ✦ *14ͷ෼ࢄ༝དྷͷΤϥʔΛό΢ϯυ͢ΔVOCJBTFEFTUJNBUPSͰ͋Δ $3.$PVOUFSGBDUVBM3JTL.JOJNJ[BUJPOΛఏҊɺ෼ࢄΛਖ਼ଇԽ߲ʹ ✦ $3.Λֶश͢Δ܇࿅ΞϧΰϦζϜ10&.ͷఏҊ

ิ଍%PVCMZSPCVTUNFUIPEGPSDPVOUFSGBDUVBM MFBSOJOH Yuan, Bowen, et al. "Improving ad click prediction
by considering non-displayed events." Proceedings of the 28th ACM International Conference on Information and Knowledge Management. 2019.

ΦϯϥΠϯධՁ ✦ ධՁࢦඪ$53 ✦ ͷ޲্͕֬ೝͰ͖ͨ ✦ ڠௐϑΟϧλϦϯάϕʔεͷख๏ͱൺֱ ✦ ڠௐϑΟϧλϦϯά͸3FMFWBODFॏࢹ ✦
౰ॳͷ໨త͸ୡ੒Ͱ͖ͨ ✦ આ໌͸ແ͔͕ͬͨʮࠓ·Ͱʹਪન͠ͳ͔ͬͨΞΠςϜΛଟ͘ਪન͢ΔࣄͰΫ ϦοΫ͕૿͑ͨʯˠ*OTQJSBUJPOΛ༩͑Δࣄ͕Ͱ͖ͨͱղऍͰ͖ͦ͏ ✦ ΫϦοΫ͕ݮ͍ͬͯͳ͍ˠϏδωεࢦඪΛᆝଛ͍ͯ͠ͳ͍

౰೔ͷ࣭ٙԠ౴ͷൈਮ 2%PVCMZ3PCVTUͰ͸ͳ͘*14ʹͨ͠ͷ͸Կނ ಛʹΦϑϥΠϯධՁͰ෼ࢄ͕໰୊ʹͳΒͳ͔͔ͬͨ "%PVCMZ3PCVTU͸ߟ͑ͳ͔ͬͨɻ͔͠͠෼ࢄΛ཈͑ΔͨΊʹ܏޲εί ΞͷΫϦοϐϯά౳Λߦͳͬͨ 2"#ςετΛि͚ؒͩ૸Βͤͨ͜ͱͰɺϢʔβʔ͕׳Ε਌͠Μͩ " ͱ͸ҧͬ
͍ͯͨͨΊ # ͷ$53͕ߴ͘ͳͬͨՄೳੑ͸͋Δ͔ "ͦͷޙ΋Ұ؏ͯ͠ߴ͍$53Λ͍ࣔͯ͠Δ͔ΒɺͦΕ͸ແ͍ͱߟ͍͑ͯΔ 2୳ࡧΛߦͳ͏ࣄͰΫϦοΫͷݮগ͸ΈΒΕͳ͔͔ͬͨ "શ͘ٯͰ૿Ճͨ͠

ࢀߟจݙ <>5ÓUI #BMÂ[T 4BOEIZB4BDIJEBOBOEBO BOE&NJM4+SHFOTFO#BMBODJOH3FMFWBODFBOE %JTDPWFSZUP*OTQJSF$VTUPNFSTJOUIF*,&""QQ'PVSUFFOUI"$.$POGFSFODFPO 3FDPNNFOEFS4ZTUFNT <>-J -JIPOH FUBM"DPOUFYUVBMCBOEJUBQQSPBDIUPQFSTPOBMJ[FEOFXTBSUJDMF
SFDPNNFOEBUJPO1SPDFFEJOHTPGUIFUIJOUFSOBUJPOBMDPOGFSFODFPO8PSMEXJEFXFC <>4XBNJOBUIBO "EJUI BOE5IPSTUFO+PBDIJNT$PVOUFSGBDUVBMSJTLNJOJNJ[BUJPO-FBSOJOH GSPNMPHHFECBOEJUGFFECBDL*OUFSOBUJPOBM$POGFSFODFPO.BDIJOF-FBSOJOH <>:VBO #PXFO FUBM*NQSPWJOHBEDMJDLQSFEJDUJPOCZDPOTJEFSJOHOPOEJTQMBZFE FWFOUT1SPDFFEJOHTPGUIFUI"$.*OUFSOBUJPOBM$POGFSFODFPO*OGPSNBUJPOBOE ,OPXMFEHF.BOBHFNFOU

論文紹介 Balancing Relevance and Discovery to Inspi...

論文紹介 Balancing Relevance and Discovery to Inspire Customers in the IKEA App

Takashi Nishibayashi

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࿦จ঺հ #BMBODJOH3FMFWBODFBOE%JTDPWFSZ UPOTQJSF$VTUPNFSTJOUIF,&""QQ 3FD4ZT࿦จಡΈձ ੢ྛ޹ !IBHJOP

"CPVUNF ✦ 4PGUXBSF&OHJOFFSBU70:"(&(3061 ✦ ޿ࠂ഑৴ϓϩμΫτͷ։ൃΛ͍ͯ͠·͢ ✦ 3FD4ZTॳࢀՃ ✦ 5XJUUFS!IBHJOP

঺հ͢Δ࿦จ

OTQJSBUJPOBM'FFE ✦ Ϣʔβʔ͸༷ʑͳ෦԰ͷλΠϓʹ͋ΘͤͯՈ۩͕ ഑ஔ͞ΕͨΠϝʔδ͕ӾཡͰ͖Δ ✦ ͜ͷϑΟʔυ͸Ϣʔβʔʹؔ࿈͕͋ΓΠϯεϐ ϨʔγϣϯΛ༩͑Δ΋ͷʹ͍ͨ͠ɻڻ͖ͷཁૉ͕ ٻΊΒΕΔɻ 3FMFWBODFBOE%JTDPWFSZUPOTQJSF

$POUFYUVBMCBOEJUTXJUICBUDIMFBSOJOHGSPN MPHHFECBOEJUGFFECBDL ✦ Ͳͷը૾Λදࣔ͢Δ͔ ✦ $POUFYUVBM#BOEJUTͰܾΊΔ ✦ $POUFYUVBM#BOEJUTͷߦಈબ୒ϙϦγʔͷֶश ✦ όονͰ΍Δ

✦ ߦಈ ✦ ը૾Λબ୒ͯ͠දࣔ͢Δࣄ ✦ ใु ✦ දࣔͨ͠ը૾͕ΫϦοΫ͞ΕΔ͔Ͳ͏͔㱨\ ^ ✦

ࢀߟ-JO6$#<> ϥ΢ϯυUʹ͓͚ΔߦಈBͷ είΞใुͷظ଴஋ ඪ४ภࠩºЋ είΞ͕࠷େͷߦಈΛ࣮ߦ ύϥϝʔλߋ৽

#BUDIMFBSOJOHGSPNMPHHFECBOEJUGFFECBDL ✦ CBOEJUGFFECBDLϩάΛ࢖ֶͬͨश ✦ աڈͷߦಈબ୒ϙϦγʔʹΑΔόΠΞεͷิਖ਼͕ඞཁ ✦ ਪનγεςϜͷϩά͸جຊతʹCBOEJUGFFECBDL ✦ ΦϯϥΠϯֶशͰ͸ͳ͍ཧ༝͸ಛʹઆ໌͕ແ͔͕ͬͨ ✦

ิ଍#BOEJU'FFECBDLϩάΛ࢖ֶͬͨश ✦ #BOEJU'FFECBDLϩάΛར༻ͨ͠৽͍͠ߦಈબ୒ϙϦγʔͷੑೳධՁΛߦͳ͏ ख๏͸ଘࡏ͢Δ ˠ0⒎1PMJDZ&WBMVBUJPO *OWFSTF1SPQFOTJUZ4DPSJOH %PVCMZ3PCVTU ʜ ✦

ଛࣦؔ਺ͷ௚ײతͳղऍ ใु͕ಘΒΕͨߦಈͰಛʹաڈͷϙϦγʔͷ܏޲είΞ͕௿͍ߦಈͷ܏޲είΞ্͕ ͕Ε͹ϩε͕Լ͕Δɻͭ·Γ͋·Γબ୒͠ͳ͔͕ͬͨΫϦοΫ͕ಘΒΕͨߦಈΛଟ͘ બͿ༷ʹֶश͢Δɻ ޱ಄ൃදεϥΠυ͔Βഈआ

ଛࣦؔ਺͸Ͳ͔͜Βདྷͨͷ͔ ޱ಄ൃදεϥΠυͷࣜ͸3FGFSFODFʹ͋Δ 4XBNJOBUIBOΒ$PVOUFSGBDUVBMSJTL NJOJNJ[BUJPO-FBSOJOHGSPNMPHHFECBOEJU GFFECBDLz $.- <>ʹ͓͚ΔఏҊख๏ ͷಋग़ͷং൫ʹ͋Δ14ϕʔεͷࣜɻ ͳͷͰ࣮ࡍʹ࢖͍ͬͯΔ

$PVOUFSGBDUVBMSJTLNJOJNJ[BUJPO-FBSOJOHGSPNMPHHFE CBOEJUGFFECBDL $.- <> ✦ 14ͷ෼ࢄ༝དྷͷΤϥʔΛό΢ϯυ͢ΔVOCJBTFEFTUJNBUPSͰ͋Δ $3.$PVOUFSGBDUVBM3JTL.JOJNJ[BUJPOΛఏҊɺ෼ࢄΛਖ਼ଇԽ߲ʹ ✦ $3.Λֶश͢Δ܇࿅ΞϧΰϦζϜ10&.ͷఏҊ

ิ଍%PVCMZSPCVTUNFUIPEGPSDPVOUFSGBDUVBM MFBSOJOH Yuan, Bowen, et al. "Improving ad click prediction

ΦϯϥΠϯධՁ ✦ ධՁࢦඪ$53 ✦ ͷ޲্͕֬ೝͰ͖ͨ ✦ ڠௐϑΟϧλϦϯάϕʔεͷख๏ͱൺֱ ✦ ڠௐϑΟϧλϦϯά͸3FMFWBODFॏࢹ ✦

౰೔ͷ࣭ٙԠ౴ͷൈਮ 2%PVCMZ3PCVTUͰ͸ͳ͘*14ʹͨ͠ͷ͸Կނ ಛʹΦϑϥΠϯධՁͰ෼ࢄ͕໰୊ʹͳΒͳ͔͔ͬͨ "%PVCMZ3PCVTU͸ߟ͑ͳ͔ͬͨɻ͔͠͠෼ࢄΛ཈͑ΔͨΊʹ܏޲εί ΞͷΫϦοϐϯά౳Λߦͳͬͨ 2"#ςετΛि͚ؒͩ૸Βͤͨ͜ͱͰɺϢʔβʔ͕׳Ε਌͠Μͩ " ͱ͸ҧͬ

ࢀߟจݙ <>5ÓUI #BMÂ[T 4BOEIZB4BDIJEBOBOEBO BOE&NJM4+SHFOTFO#BMBODJOH3FMFWBODFBOE %JTDPWFSZUPOTQJSF$VTUPNFSTJOUIF,&""QQ'PVSUFFOUI"$.$POGFSFODFPO 3FDPNNFOEFS4ZTUFNT <>-J -JIPOH FUBM"DPOUFYUVBMCBOEJUBQQSPBDIUPQFSTPOBMJ[FEOFXTBSUJDMF