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09NLP-muramatsu.pdf
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自然言語処理研究室
July 03, 2013
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09NLP-muramatsu.pdf
自然言語処理研究室
July 03, 2013
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Transcript
ߏจยΛ༻͍ͨ ߏจยΛ༻͍ͨ ཁจੜ ཁจੜ Ԭٕज़Պֶେֶ Ԭٕज़Պֶେֶ ిؾܥ ిؾܥ ଜদ ଜদ
༞ر ༞ر ࢁຊ ࢁຊ ӳ ᶃ ӳ
త త ɾ৽͍͠ॲཧ୯ҐͰจষΛཁ ɾ৽͍͠ॲཧ୯ҐͰจষΛཁ ˠܗଶૉจઅ୯ҐͰߦΘͳ͍ ˠܗଶૉจઅ୯ҐͰߦΘͳ͍ ˠจੜΛߦ͏ʢจষ͔ΒจΛੜʣ ˠจੜΛߦ͏ʢจষ͔ΒจΛੜʣ ɾ౷ܭϞσϧΛΘͳ͍ ɾ౷ܭϞσϧΛΘͳ͍
ˠ ˠਓ͕ؒݟͯࣗવͳཁจΛੜ ਓ͕ؒݟͯࣗવͳཁจΛੜ ᶄ
طଘݚڀ طଘݚڀ ɾ ɾΒ Β[2008] [2008] - -༻ྫϕʔεͱͨ͠ཁख๏ ༻ྫϕʔεͱͨ͠ཁख๏ -
-ೖྗจͱ༻ྫͷྨࣅΛ༻ ೖྗจͱ༻ྫͷྨࣅΛ༻ ɾ ɾງΒ ງΒ[2002] [2002] - -ʮ ʮTri Tri- -gram gramʯͱʮ ʯͱʮTF TFɾ ɾIDF IDFʯΛݩʹ࠷దԽ ʯΛݩʹ࠷దԽ ᶅ
ྨࣅ༻ྫܕཁ ྨࣅ༻ྫܕཁ ྨࣅ༻ྫจΛબ͢Δ؍શ෦Ͱ ྨࣅ༻ྫจΛબ͢Δ؍શ෦Ͱ3 3ͭ ͭ ɾ ɾʮॿࢺͷҰகʯ ʮॿࢺͷҰகʯˠ ˠػೳޠͷද
ػೳޠͷද ɾʮݻ༗දݱλάͷҰகʯ ɾʮݻ༗දݱλάͷҰகʯ ˠߏจղੳثͷղੳ݁Ռ ˠߏจղੳثͷղੳ݁Ռ ɾʮ୯ޠؒྨࣅʯ ɾʮ୯ޠؒྨࣅʯˠ୯ޠͷ૬ޓใྔ ˠ୯ޠͷ૬ޓใྔ ᶆ
ʮߏจยʯͱʁ ʮߏจยʯͱʁ ຊݚڀ͕ࣨఏҊͨ֓͠೦ ຊݚڀ͕ࣨఏҊͨ֓͠೦ - -ʮ̎จઅͷΓड͚ʯͷରͰ͋Δ ʮ̎จઅͷΓड͚ʯͷରͰ͋Δ ߏจยͷྫ ߏจยͷྫ ྫʮ
ྫʮS Sࣾͷܞଳӷথ͕ΩϨΠʯ ࣾͷܞଳӷথ͕ΩϨΠʯ ʮ ʮS SࣾͷܞଳʯɺʮܞଳΩϨΠʯɺʮӷথ͕ΩϨΠʯ ࣾͷܞଳʯɺʮܞଳΩϨΠʯɺʮӷথ͕ΩϨΠʯ ͱ͍ͬͨ ͱ͍ͬͨ3 3ͭͷߏจยʢ୯ҐϐʔεʣʹͳΔ ͭͷߏจยʢ୯ҐϐʔεʣʹͳΔ ᶇ
ʮߏจยʯͷར ʮߏจยʯͷར ɾ ɾநग़͕༰қͰ͋Δ நग़͕༰қͰ͋Δ - -ʮ̎จઅͷΓड͚ʯΛجʹநग़ ʮ̎จઅͷΓड͚ʯΛجʹநग़ ɾ ɾ෦ʹམͱ͢͜ͱͰ؆ུԽ
෦ʹམͱ͢͜ͱͰ؆ུԽ - -ߏͰѻ͏ϨϕϧΛ؆୯Խ ߏͰѻ͏ϨϕϧΛ؆୯Խ ɾ ɾҙຯతͳܨ͕Γ ҙຯతͳܨ͕Γ - -୯ޠจઅΑΓᐆດੑ͕ແ͘ͳΔ ୯ޠจઅΑΓᐆດੑ͕ແ͘ͳΔ ᶈ
Ξϓϩʔν Ξϓϩʔν ᶗ ᶗ. . ༻ྫจͷબ ༻ྫจͷબ - -ೖྗهࣄͱҙຯతʹ͍ۙ༻ྫจΛબ ೖྗهࣄͱҙຯతʹ͍ۙ༻ྫจΛબ
ᶘ ᶘ. . ߏจยͷରԠ͚ ߏจยͷରԠ͚ - -ೖྗจͱ༻ྫจͷରԠΛಘΔ ೖྗจͱ༻ྫจͷରԠΛಘΔ ᶙ ᶙ. . ཁจͷੜ ཁจͷੜ - -ରԠ͚ΒΕͨߏจยΛ༻͍ͯจੜ ରԠ͚ΒΕͨߏจยΛ༻͍ͯจੜ ᶉ
γεςϜਤ γεςϜਤ ӳจࣈจઅ A/B/C/Dɻ E/F/G/Hɻ I/J/K/Lɻ a/b/c/d/eɻ Pi[AˠD] Pi[B ˠD]
Pi[EˠG] Pi[F ˠG] Pi[J ˠ L ] Pi[Kˠ L ] Pi[I ˠ J] Pi[GˠH] ༻ྫจͷू߹ ೖྗهࣄ ɻ ɻ ɻ ༻ྫจ ᶗ Ps[aˠc] Ps[bˠc] Ps[cˠe] Ps[dˠe] ग़ྗཁจ ᶊ A/G/B/J/Lɻ ᶘ ᶙ
༻ྫจͷબ ༻ྫจͷબ ɾ ɾߏจยͷྨࣅΛ༻͍ͯ༻ྫΛબ ߏจยͷྨࣅΛ༻͍ͯ༻ྫΛબ ᶋ
ʮߏจยʯͷྨࣅ ʮߏจยʯͷྨࣅ ɾ ɾEDR EDRͷγιʔϥεΛ༻͍ͯܭࢉ ͷγιʔϥεΛ༻͍ͯܭࢉ Ps(i)ʹ༻ྫʢೖྗʣͷߏจย Sme(Ime)=༻ྫจ(ೖྗจ)ͷΓݩจઅ ɺ Smc(Imc)=༻ྫจ(ೖྗจ)ͷΓઌจઅ
dk=SmeͱImeͷڞ௨্Ґϊʔυͷਂ͞ɺdi=Imeͷϊʔυͷਂ͞(dsSmeΛࣔ͢) ᶌ
ཁจͷੜ ཁจͷੜ ʻೖྗهࣄʼ ւಓ࿈߹ւ۠ړۀௐҕһձ͕·ͱΊͨീͷळαέͷ ࠷ऴړ֫ঢ়گͰɺړ֫ྔࡾઍඦࣣेສೋઍඦ࢛ेҰඌͰ લಉظൺҰ࢛ɾീˋݮͱͳͬͨ ɻւਫԹͷ্ঢ͕ෆړͷݪҼͱ͞ΕΔɻ ʻ༻ྫจʼ ݄̍̌ͷ֎՟४උߴ̔̐̍̓ԯ̎̌̌̕ສυϧͰલ݄ൺ ̍̓ԯ̓̍̌̌ສυϧݮɻ
ʻग़ྗཁจʼ ෆړͷݪҼͱ͞ΕΔړ֫ྔલಉظൺҰ࢛ɾീˋݮͱͳͬͨɻ ᶍ
ࣗಈධՁ ࣗಈධՁ ɾ ɾਖ਼ղσʔλʹਓखཁจΛ༻ ਖ਼ղσʔλʹਓखཁจΛ༻ ධՁई ैདྷख๏ ຊख๏ BLEUͷฏۉʢ100݅ʣ 0.41
0.08 ROUGE-4ͷฏۉʢ100݅ʣ 0.85 0.64 BLEU20ˋɺROUGE-475ˋͷ ύϑΥʔϚϯε͔͠ग़ͳ͍݁Ռ ᶎ
ߟ ߟ ᶗ ᶗ ᶗ ᶗ. . EDR EDRͷཏੑͷௐࠪ݁Ռ ͷཏੑͷௐࠪ݁Ռ
༻ྫจͷू߹ ධՁ࣮ݧσʔλ ܗଶૉ 1,003,459 16,188 ༰ޠ 677,855 9,998 EDR֓೦ࣙॻͱ ͷ߹க 294,445 4,394 ༰ޠʹର͢ΔEDR֓೦ࣙॻͷཏੑ ༻ྫจɺධՁ࣮ݧσʔλڞʹ44ˋͰ͋ͬͨɻ ˰EDR͚ͩͰγιʔϥεใ͕Γͳ͍ ᶏ
ߟ ߟ ᶘ ᶘ ᶘ ᶘ. .༰ޠɺߏจยͷྨࣅ ༰ޠɺߏจยͷྨࣅ ༰ޠ ߏจย
ධՁऀA 62/100 (62%) 34/100 (34%) ධՁB 38/100 (38%) 22/100 (22%) ධՁC 64/100 (64%) 42/100 (42%) ᶐ ༰ޠͷྨࣅ͕0.9ʢ࠷େ1ʹରͯ͠ʣΛӽ͑ͨ ͷʹରͯ͠9ׂ͕ਓؒͷओ؍ͱҰகͨ͠ɻ ˰ʮߏจยʯͷྨࣅ͕՝ͱͳΔ
݁ ݁ ɾ ɾߏจยΛ༻͍ͯཁจੜΛߦͬͨ -༰ޠͷྨࣅਓؒͷओ؍ʹ͍ۙ -ߏจยͷྨࣅʹؔͯ͠࠶ݕ౼͕ඞཁ ߏจยͷྨࣅʹؔͯ͠࠶ݕ౼͕ඞཁ - -γιʔϥεʹؔͯ͠ผͷϦιʔε͕ඞཁ γιʔϥεʹؔͯ͠ผͷϦιʔε͕ඞཁ
ᶑ
ධՁ࣮ݧ ධՁ࣮ݧ ɾ ɾ༻ྫจͷू߹ ༻ྫจͷू߹ - -27036 27036݅Λ༻ʢܦχϡʔεϝʔϧ ݅Λ༻ʢܦχϡʔεϝʔϧ ʣ
ʣ ɾ ɾධՁ࣮ݧσʔλ ධՁ࣮ݧσʔλ - -ຊܦࡁ৽ฉ ຊܦࡁ৽ฉ 100 100݅Λཁରͱ͢Δ ݅Λཁରͱ͢Δ ᶒ
ਓखධՁ ਓखධՁ ɾ ɾ༰దੑͷൺֱධՁ ༰దੑͷൺֱධՁ ैདྷख๏ ຊख๏ ධՁऀA 82/100 (จ)
18/100 (จ) ධՁऀB 82/100 (จ) 18/100 (จ) ɾ ɾՄಡੑධՁͷൺֱධՁߦͬͨ ՄಡੑධՁͷൺֱධՁߦͬͨ - -͔͠͠ɺैདྷख๏ΑΓԼճΔ ͔͠͠ɺैདྷख๏ΑΓԼճΔ ᶓ
ߟ ߟ ɾ ɾ࣍ͷ̎ʹ͍ͭͯՃௐࠪΛߦͬͨ ࣍ͷ̎ʹ͍ͭͯՃௐࠪΛߦͬͨ ᶗ ᶗ. . EDR EDRͷཏੑ
ͷཏੑ - -༻ྫจͱ ༻ྫจͱධՁ࣮ݧσʔλ ධՁ࣮ݧσʔλʹؔͯ͠ௐࠪ ʹؔͯ͠ௐࠪ ᶘ ᶘ. .༰ޠɺߏจยͷྨࣅ ༰ޠɺߏจยͷྨࣅ - -ਓؒͷओ؍ͱͷҰகੑʹؔͯ͠ௐࠪ ਓؒͷओ؍ͱͷҰகੑʹؔͯ͠ௐࠪ ᶔ