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20191005_Recsys2019_Users_In_The_Loop.pdf
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Waku Michishita
October 05, 2019
Research
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250
20191005_Recsys2019_Users_In_The_Loop.pdf
Waku Michishita
October 05, 2019
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Transcript
6TFSTJOUIF-PPQ "1TZDIPMPHJDBMMZ*OGPSNFE"QQSPBDIUP 4JNJMBS*UFN3FUSJFWBM ͷհ 3FD4ZTจಡΈձ!8BOUFEMZ ಓԼ ٱ
ຊհ͢Δจ • λΠτϧ 6TFSTJOUIF-PPQ"1TZDIPMPHJDBMMZ*OGPSNFE "QQSPBDIUP4JNJMBS*UFN3FUSJFWBM • ஶऀ "NZ"8JOFDPGG 'MPSJO#SBTPWFBOV #SZDF
$BTBWBOU 1FBSDF8BTIBCBVHI BOE.BUUIFX (SBIBN 5SVF'JU
֓ཁ • ఏҊ .BUIFNBUJDBMͳྨࣅͰͳ͘1TZDIPMPHJDBMMZ *OGPSNFEͳྨࣅΛϨίϝϯυʹ༻͍ͯͲ͏͔ʁ • ҙࣝ ΦϑϥΠϯධՁͱΦϯϥΠϯධՁཱ͕྆͠ͳ͍ .BUIFNBUJDBMͳྨࣅ͕Ϣʔβͷ৺ཧతཁҼΛߟྀ ͍ͯ͠ͳ͍͔ΒͰʁ
͜ͷจͰΓ͍ͨ͜ͱ 1TZDIPMPHJDBMMZ*OGPSNFEͳྨࣅͷଌఆ ํ๏ͷཱ֬ 1TZDIPMPHJDBMMZ*OGPSNFEͳྨࣅͷఆࣜԽ
)VNBO1FSDFQUJPOBOE+VEHFNFOUT ਓؒͷ֮Λௐࠪ͢Δํ๏৭ʑ͋Δ • Α͘༻͍ΒΕΔͷ 4JOHMF*UFN"QQSPBDI • ࠓճ͍͍ͨͷ 'PSDFE$IPJDF
4JOHMF*UFN"QQSPBDI ҎԼͷΑ͏ͳ࣭Λ͛ͯධՁͤ͞Δํ๏
4JOHMF*UFN"QQSPBDIͷܽ 4JOHMF*UFN"QQSPBDIͷલఏͷ͍͔ͭ͘ ࣮ࡍʹΓཱͨͳ͍ͱࢦఠ • UIFTDBMFJTVTFEJOUIFTBNF VOCJBTFE XBZCZBMMQBSUJDJQBOUT ˡ࣮ࡍྑ͍ํʹධՁ͕ͪͩͬͨ͠Γ͢Δ • IVNBOTIBWFTUBCMF
BCTPMVUFQSFGFSFODF ˡ࣮ࡍจ຺ೝͷڐ༰ྔʹΑ੍ͬͯݶ͞ΕΔ
'PSDFE$IPJDF ҎԼͷΑ͏ʹೋऀҰͰ͑ͤ͞Δܗࣜ ͋ͳ͕ͨམͱͨ͠ͷ ۚͷ佁ʁͦΕͱۜͷ佁ʁ
'PSDFE$IPJDFͷརͱܽ • ར • ईͷղऍʹᐆດ͕͞ͳ͍ • Ϣʔβ͕Ͳ͜Ͱࣅ͍ͯΔʗࣅ͍ͯͳ͍ͷڥքઢΛҾ ͍ͨͷ͔ཧղ͍͢͠ • ܽ
• ϢʔβʹΑͬͯڥքઢΛͻ͘5ISFTIPME͕ҟͳΔ • ࣮ࡍʮͲͪΒબͳ͍ʯͱ͍͏બ͕͋Γ͏Δ ͨͩ͠ࠓճٻΊ͍ͯΔճʮͲͪΒ͕ൺֱతࣅ͍ͯΔ ͔ʯͳͷͰ͜ͷҰ୴ແࢹ͢Δ͜ͱͱ͍ͯ͠Δɻ
4JNJMBSJUZͷධՁ ैདྷͷํ๏ Ϩίϝϯσʔγϣϯʹ͓͍ͯΑ͘༻͍ΒΕΔͷ NFUSJDEJTUBODFGVODUJPOϕʔεͷͷ FY +BDDBSE 4JNJMBSJUZ " ,
= | ∩ | | ∪ | • ه߸ͷఆٛͦΕͧΕҎԼͷ௨Γ , +BDDBSEʹجͮ͘ྨࣅ , ྨࣅΛௐΔΞΠςϜ , ֤ΞΠςϜͷಛྔ
ܽ ैདྷͷࢦඪͰҎԼͷ͜ͱ͕ߟྀͰ͖͍ͯͳ͍ͱࢦఠ • ྨࣅੑఆͷඇରশੑ ʮ"ͱ#ࣅ͍ͯΔ͔ʁʯͱʮ"#ʹࣅ͍ͯΔ͔ʁʯ Ͱ݁Ռ͕ҟͳΓ͏Δ • ಛྔͷྨࣅͷد༩ͷҧ͍ ࣮ࡍϢʔβ͕֮͢Δಛྔͷد༩ҟͳΔͷͰʁ
4JNJMBSJUZͷධՁ ఏҊ͞Εͨํ๏ • 5WFSTLZNPEFM • ಛྔ͝ͱͷॏཁΛߟྀͨ͠ྨࣅ ҎԼͷΑ͏ʹఆࣜԽ͞ΕΔ - ,
= ∩ − − − ( − ) • ه߸ͷఆٛ ∩ ͱͷ྆ํʹؚ·ΕΔಛྔ − ʹͷΈଘࡏ͢Δಛྔ − ʹͷΈଘࡏ͢Δಛྔ , , ্هͷͦΕͧΕͷॏཁΛௐ͢Δύϥϝʔλ
࣮ݧํ๏ UBSHFUʢਅΜதʣʹ͍ͭͯͲͪΒͷBMUFSOBUJWF͕ ΑΓࣅ͍ͯΔͷ͔͑ͤ͞Δ ࣮ݧͷࡉ͔͍ઃఆจࢀর
ྨࣅͷఆࣜԽ • NVMUJMFWFM-PHJTUJD3FHSFTTJPOΛ༻͍ͯ • ͦΕͧΕͷಛྔͷد༩ͷҧ͍Λ໌Β͔ʹ͢Δ • +BDDBSEͱͷྨࣅͷҧ͍Λ໌Β͔ʹ͢Δ • 5WFSTLZNPEFMͷྨࣅ -5,6
= - -∩: − - -;: − (:;-) = (, , ) ֤ಛྔͷॏΈ ͱॏཁͷύϥϝʔλ -∩: ྆ऀʹڞ௨ͷಛྔ͔Ͳ͏͔Λࣔ͢\ ^ͷϕΫτϧ -;: λʔήοτ5ʹͷΈʹଘࡏ͢Δಛྔ͔Ͳ͏͔Λࣔ͢ :;- ൺֱର"ʹͷΈʹଘࡏ͢Δಛྔ͔Ͳ͏͔Λࣔ͢
༻ͨ͠ಛྔ 4-NBUDI4MFFWF-FOHUI͕Ұக͢Δ͔ %- NBUDI%SFTT-FOHUI͕Ұக͢Δ͔ 14 NBUDI1BUUFSO4UZMF͕Ұக͢Δ͔ $' NBUDI$PMPS'BNJMZ͕Ұக͢Δ͔ %4 NBUDI%SFTT4IBQF͕Ұக͢Δ͔
/- NBUDI/FDL-JOF͕Ұக͢Δ͔ %' NBUDI%SFTT'JU͕Ұக͢Δ͔
ଛࣦؔͱ࠷దԽ • ଛࣦؔ = − 1 ? @AB C @
log @Δ- + 1 − @ log 1 − @ ΔSL ℎ @- = B BPQRS ;TU5 V , Δ- = -5,6 − -5,W () • ࠷దԽ minV − B [ log − B [ log − B [ log ℎ ≫ 0 ℎ −
݁Ռ֓ཁ ಛྔ͝ͱʹد༩͕ҧ͏ -PHJTUJD3FHSFTTJPOͷ݁Ռ5WFSTLZ NPEFMͷํ͕ྑ͔ͬͨ ʢ͔֓͠͠Ͷࣅͨ݁Ռʹͳ͍ͬͯΔʣ Ұ෦Ͱྨࣅʹ͕ࠩݱΕͨ
ଐੑ͝ͱͷد༩ͷҧ͍ • Ұ୴୯७ͳ-PHJTUJD3FHSFTTJPOͰಛྔ͝ͱ ͷӨڹΛ֬ೝ • ಛྔ͝ͱʹد༩ҟͳΔʢ5BCMFʣ ͜ͷ࣌Ͱ·ͩ5WFSTLZNPEFMΛ͍ͬͯͳ͍
ଐੑ͝ͱͷد༩ͷҧ͍ • 5WFSTLZNPEFMͰઌͷ݁Ռͱಉ༷ಛྔ͝ͱ ʹد༩͕ҧ͏ • , ʹ͕ࠩग़͓ͯΓఆʹඇରশੑ͕͋Δ ͱΘ͔Δ ্هGPMEͷฏۉΛͱͬͨͷ
݁Ռ ྨࣅੑఆͷҧ͍ • ϩδεςΟοΫͷ݁Ռ5WFSTLZNPEFMͷํ ͕Α͔ͬͨ • จͰݴٴͷΈ • ͔ͨͩ͠ͳΓࣅͨΑ͏ͳ݁Ռʹͳ͍ͬͯͨΒ͍͠
• ྨࣅʹ͕ࠩݱΕͨ • ྨࣅͷఆ͕͍͠Έ߹Θͤ ΄Ͳ྆ऀʹ͕ࠩͰ͍ͯΔ • Ұํ͔ͳΓྨࣅ͍ͯ͠Δ PSશ͘ྨࣅͯ͠ͳ͍߹ͷ ͔ࠩͳΓখ͍͞
՝ • ʮબ͠ͳ͍ʯͱ͍͏બࢶ ͜ͷબࢶ͕͋Δ߹৺ཧతͳಈ͖ʹӨڹ͕͋Γ͏Δ • ϨίϝϯυͰͲ͜·Ͱ͑Δ͔ະ ࠓճղ͍ͨͷ͋͘·Ͱྨ