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B3_Seminar_07

 B3_Seminar_07

長岡技術科学大学
自然言語処理研究室
角張竜晴

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kakubari

March 30, 2017
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  1. BLEU ࢀর༁T  ɿ5IFDBUJTPOUIFNBU ʢୈҰͷࢀর༁ʣ ɹɹɹT  ɿ5IFSFJTBDBUPOUIFNBUʢୈೋͷࢀর༁ʣ  ධՁͷର৅ͱͳΔػց຋༁ͷ݁ՌɿT

    ὎5IFNBUJTPOUIFDBU  ͜ͷจTʹؚ·ΕΔશϢχάϥϜ͸ HSBN  T \lUIFz lNBUz lJTz lPOz lDBUz^  ྫ͑͹ɺzUIFzͷස౓͸Ͱ͋Γɺ ͜ΕΛ$ lUIFz  ͷΑ͏ʹද͢ɻ  6
  2. BLEU ಉ༷ʹɺTʹରԠ͢ΔୈҰͷࢀর༁T  Ͱ͸ $ lUIFz T   

    ୈೋͷࢀর༁T  ʹ͍ͭͯ͸ $ lUIFz T    ػց຋༁ͷ݁Ռͷ֤จTΛධՁ͢Δʹ͸ɺ ࢀর༁தͰ͜ΕʹରԠ͢Δਖ਼ղ༁ͱͷۙ͞Λߟ͑Δɻ 7
  3. BLEU ैͬͯɺHSBN  T  HSBN  T ͕ͱ΋ʹؚΉ֤Ϣχά ϥϜFʹ͍ͭͯɺස౓ΛמΓࠐΉ

    $MJQ ɻ  $MJQ F T NJO NBY $ F T  $ F T   ྫ͑ɺ$ lUIFz T Ͱ͋ͬͯ΋ɺ ɹɹɹ$ lUIFz T  Ͱ͋Ε͹ɺ  $MJQ lUIFz T ̎   9
  4. BLEU ɹಉ༷ʹόΠάϥϜʹ͍ͭͯ΋ߟ͍͑ͯ͘ɻ ػց຋༁Tʹ͍ͭͯ HSBN  T \lUIFNBUz lNBUJTz lJTPOz lPOUIFz

     lUIFDBUz^ ͱͳΔɻ ɹҎ্ΑΓɺਖ਼ղ༁ʹؚ·Εͳ͍zNBUJTz͕ଘࡏ͢Δ ͜ͱ͕Θ͔ΓɺϢχάϥϜΑΓ΋ࡉ͔͍ධՁͰ͖Δɻ  ὎/άϥϜͰ͸ɺΑΓࡉ͔͍ධՁ͕Ͱ͖Δ 10
  5. BLEU #-&6Ͱ͸ɺ͞Βʹ/   ʹ͍ͭͯ1SFD/ ΛҎԼ ͷΑ͏ʹ݁߹͢Δɻ   

    ͜Ε͸ਫ਼౓ʹࣅͨࢦඪͷͨΊɺػց຋༁݁Ռʹؚ·Ε ΔϊΠζʹରͯ͠ϖφϧςΟΛ༩͑Δ͜ͱ͕Ͱ͖Δɻ  PREC = exp( 1 4 lnPrec N N∈{1,2,3,4} ∑ ) 12