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Contextual Bandit による表示コンテンツの最適化
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j.harashima
October 16, 2014
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Contextual Bandit による表示コンテンツの最適化
j.harashima
October 16, 2014
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Transcript
$POUFYUVBM#BOEJUʹΑΔ දࣔίϯςϯπͷ࠷దԽ ΫοΫύουגࣜձࣾ ٕज़෦ݕࡧάϧʔϓ ݪౡ७
ݪౡ७ wΤϯδχΞ!ΫοΫύου wത࢜ʢใֶʣ wࣗવݴޠॲཧˍใݕࡧ
ͷ݄ؒར༻ऀສਓ Ϩγϐສ ʢ݄ʣ
ϞόΠϧར༻ऀͷ૿Ճ
1$ εϚϗʢϒϥβʣ εϚϗʢΞϓϦʣ Ψϥέʔ
ը໘αΠζ ʙΠϯν ʙΠϯν ʙΠϯν
6*͕ෳࡶԽ ݙཱΛग़ͨ͠Βศརʁ Ϣʔβ͞ΜʹΑΔ ͓͢͢ΊϨγϐͱ͔ ྉཧͷίπͳΜͯͲ͏ʁ ৽͍͠ίϯςϯπΛग़ͦ͏ʂ χϡʔεɺಈըɺ JOݕࡧ݁Ռϖʔδ Ϩγϐ͚ͩͰϢʔβͷཁʹԠ͑ΒΕ ͳ͍͕ɺίϯςϯπΛେྔʹग़͢ͷ
౷߹ݕࡧ
ݕࡧ݁Ռϖʔδ ΫΤϦ͝ͱʹ ࠷దͳίϯςϯπ͚ͩΛදࣔ ʢ݄ʙɺࠓϒϥβ൛ͷΈରԠʣ Ͳ͏ͬͯʁ
.VMUJ"SNFE#BOEJU w ୳ࡧͱ׆༻Λ͍͚ͯใुΛ࠷େԽ w ୳ࡧɿใΛऩू͢ΔͨΊʹΛબ w ׆༻ɿऩूͨ͠ใʹج͍ͮͯΛબ w ୳ࡧͱ׆༻τϨʔυΦϑ
$POUFYUVBM#BOEJU w ͷใु͕ίϯςΩετʹΑͬͯҧ͏ w FHࠂͷ$53ݟΔਓʹΑͬͯҧ͏ w ίϯςΩετΛૉੑͰදݱ w ใु͕࠷େͱͳΔΑ͏ʹॏΈΛֶश w
ίϯςΩετ͝ͱʹ࠷దͳΛબ
#BOEJUJODPPLQBE w ɿίϯςϯπʢFHݙཱɺχϡʔεʣ w ใुɿ$53 w ૉੑɿΫΤϦͳͲ w ֶशɿ7PXQBM8BCCJUΛར༻ʢരʂʣ w
୳ࡧɿҰ෦17ͰϥϯμϜʹίϯςϯπΛදࣔ w ׆༻ɿ$53࠷େͱظ͞ΕΔίϯςϯπΛදࣔ ʢ,%%ͷ:BIPP-BCTͷจΛΞϨϯδʣ
શମਤ 0⒐JOF 0OMJOF explore exploit log*show/click*events Treasure*Data
FH݄ʹࡾͷσʔλͰֶशͯ͠ɺҰͷσʔλʹରͯ͠ਪఆ͢Δ߹ 0⒐JOF 0OMJOF 10/9 10/10% 10/11% 10/9 10/10% 10/11% m/d
m/d md% % md% % construct%training% and%test%data m/d% % %m’/d’% mdm’d’ % % Amazon%S3 10/9% % 10/11% … … predict%ac:ons learn%model% % % Treasure%Data
ิɿ୳ࡧͷׂ߹ w ݱࡏ w ҰఆʢҰ෦17ʣ w ࠓޙ w ঃʑʹσʔλ͕ੵʢJF৴པ্͕ঢʣ w
୳ࡧͷׂ߹ݮΒ͍͚ͯ͠Δ
ิɿਪఆͷํ๏ w ϦΫΤετͷʹਪఆ w ϨεϙϯελΠϜ͕ѱԽͦ͠͏ w ϦΫΤετͷલʹਪఆ w ߴසͷίϯςΩετʹରͯ͠༧ΊΛ ਪఆɺ݁ՌΛςʔϒϧʹอ͍࣋ͯ͠Δ
݁Ռ w 6*Λγϯϓϧʹอͯͨ w $53͕ߴ͍ίϯςϯπΛ දࣔͰ͖ΔΑ͏ʹͳͬͨ ʢ୳ࡧ݁Ռͱൺͯʣ ʮΦϜϨπʯ ݙཱ ˞݄࣌Ͱͷ݁Ռ
ʮϋϯόʔάʯ ʮ͓ͰΜʯ ňೕ৯ʼn χϡʔε ΧϑΣʢܝࣔ൘ʣ ͓͢͢ΊϨγϐ
ৄࡉ ଓ͖8FCͰʂ ΫοΫύου։ൃऀϒϩά ݕࡧ ʢ݄ࠒɺଟʣ
·ͱΊ w ϞόΠϧར༻ऀͷ૿Ճ w ϞόΠϧը໘͕খ͍͞ w ίϯςϯπΛେྔʹදࣔˠ6*͕ෳࡶԽ w ΫΤϦ͝ͱʹ࠷దͳίϯςϯπ͚ͩΛදࣔ w
$POUFYUVBM#BOEJUͷར༻
ࠓޙͷల w ୳ࡧׂ߹ͷௐ w ৴པͷಋೖʢͬͱڧԽֶशͬΆ͘ʂʣ w ίϯςϯπͷՃ w ྉཧͷಈըɺྉཧͷίπɺ w
ΞϓϦͷల։