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The first step of the Top-k Selection algorithm in search

po3rin
December 18, 2020

The first step of the Top-k Selection algorithm in search

po3rin

December 18, 2020
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  1. The first step of
    the Top-k Selection
    algorithm in search
    M3 tecktalk
    #164
    hiromu-nakamura @po3rin

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  2. தଜ߂෢
    ΤϜεϦʔͷ"*ɾػցֶशνʔϜͰݕࡧج൫पΓ
    Λ୲౰͍ͯ͠Δɻ(P͕޷͖ɻ
    ֤छΞΧ΢ϯτQPSJOͰ΍ͬͯ·͢ɻ
    )*SPNV/BLBNVSB

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  3. View Slide

  4. ݕࡧΤϯδϯ͸ΫΤϦΛड͚औΓɺυΩϡϝϯτ͝ͱʹ
    είΞܭࢉΛείΞ্ҐL݅Λฦ͢ɻ
    4FBSDI&OHJOF
    ΫΤϦ
    L݅ͷείΞॱυ
    Ωϡϝϯτ

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  5. &MBTUJDTFBSDIͳͲͷݕࡧΤϯδϯ͸ɺ୯ޠͷҐஔ৘ใΛ
    ֨ೲ͢ΔͨΊͷࡧҾσʔλߏ଄Ͱ͋ΔసஔΠϯσοΫε
    Λ࠾༻͍ͯ͠Δɻ
    4FBSDI&OHJOF
    %ࢲ͸ম೑Λ৯΂Δ
    %ࢲ͸αϥμ΋৯΂Δ
    ʮম೑ʯ
    %
    సஔΠϯσοΫε

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  6. ݕࡧʹ͓͚ΔυΩϡϝϯτͷείΞϦϯάʹ͸0LBQJ
    #.ͳͲ୅දతͳ΋ͷ͕͋ΔLɻ͜ΕΛݕࡧʹώοτ
    ͢ΔυΩϡϝϯτʹରͯ͠ܭࢉ͍ͯ͘͠ɻ
    4DPSJOH

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  7. υΩϡϝϯτશͯͷείΞϦϯά͕ऴ͔ྃͯ͠ΒͦΕΒΛฒ
    ͼସ͑Δͷ͸ϥϯΩϯά্ҐL൪໨·Ͱͷ݁Ռʹڵຯ͕͋Δ৔
    ߹ඇޮ཰ɻͦ͜Ͱݕࡧʹ͓͚ΔLݸͷ࠷େཁૉʢ·ͨ͸࠷খ
    ཁૉʣΛબ୒͢Δ໰୊Λߟ͑Δɻ
    5PQLTFMFDUJPO

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  8. 5PQL
    TFMFDUJPO
    ೋ෼ώʔϓʹυΩϡϝϯτͱείΞΛอ͍࣋ͯ͘͜͠ͱͰ࠷
    ऴతͳιʔτͷίετΛεϧʔͰ͖Δɻώʔϓʹ֨ೲ͢Δ͔
    ͸ࠜͷείΞ͚ͩݟΕ͹ྑ͍ɻ
    ೋ෼ώʔϓ



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  9. 5PQL
    TFMFDUJPO
    ࠓ·Ͱݕࡧʹώοτͨ͠શͯͷυΩϡϝϯτͷείΞΛܭࢉ
    ͍͕ͯͨ͠ɺ࣮͸είΞΛܭࢉ͠ͳͯ͘΋ɺ͋ΔυΩϡϝϯ
    τ͕UPQLʹೖΒͳ͍͜ͱΛ֬ఆͰ͖Δํ๏͕͋ΔɻͦΕ͕
    NBYTDPSFͱݺ͹ΕΔख๏Ͱ͢ɻ
    .BYTDPSF

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  10. ͷ໾ׂ͸ΫΤϦλʔϜͦΕͧΕͷείΞ΁ͷߩݙ౓ͷ্ݶ
    Λܾఆ͢Δ͜ͱɻ ͷܦݧతॳظ஋Λ࠾༻͢Δͱɺ5'஋
    ্ࣜͷୈҼࢠ
    ͸ ͭ·ΓΛ௒͑ͳ͍ɻ*%'΋ࣄલ
    ʹܭࢉͰ͖Δɻ͜ΕʹΑΓ֤λʔϜ͕د༩͢Δ࠷େείΞ͸
    ࣄલʹܾఆͰ͖ΔɻͦͷͨΊϥϯΩϯά্ҐʹݱΕͳ͍υ
    Ωϡϝϯτ͸͋Β͔͡ΊΘ͔Δɻ
    k1
    k1
    k1
    + 1
    4DPSJOH
    5PQL
    TFMFDUJPO

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  11. 4DPSJOH
    λʔϜ .BY4DPSF
    UIF
    TFBSDI
    FOHJOF



    ͜ͷ࣌఺ͰzUIFzؚ͔͠·ͳ͍ϙεςΟϯάϦετͷείΞܭ
    ࢉ͸ແࢹͰ͖ΔɻͳͥͳΒ࠷େείΞ͸ݱࡏͷώʔϓͷࠜ
    ͷείΞΛ௒͑ͳ͍͔Βɻ
    5PQL
    TFMFDUJPO

    View Slide

  12. 4DPSJOH
    λʔϜ .BY4DPSF
    UIF
    TFBSDI
    FOHJOF



    ͜ͷ࣌఺Ͱ͸zUIFzͱzTFBSDIzؚ͔͠·ͳ͍υΩϡϝϯτͷε
    ίΞܭࢉ͸ແࢹͰ͖ΔɻͳͥͳΒ࠷େείΞ͸ݱࡏͷ
    ώʔϓͷࠜͷείΞΛ௒͑ͳ͍͔Βɻ
    5PQL
    TFMFDUJPO

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  13. *OUFSWBMCBTFEQSVOJOH
    TFBSDI
    FOHJOF
    %PDVNFOU
    ◾◾◾◾◾◾
    ◾◾◾◾◾
    NBY
    NBY


    TDPSF
    ͜ͷ࣌఺ͰzFOHJOFz͚͔ͩ͠ग़ݱ͍ͯ͠ͳ͍υΩϡϝϯτ͸ແࢹͰ͖Δ
    ͜ͷ࣌఺ͰzTFBSDIz͚͔ͩ͠ग़ݱ͍ͯ͠ͳ͍υΩϡϝϯτ͸ແࢹͰ͖Δ
    XBMLEPDT

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  14. *OUFSWBMCBTFEQSVOJOH
    ࣮ફͰ͸ϙεςΟϯάϦετ͸ѹॖ͞Ε͍ͯΔͷͰϒϩοΫ
    αΠζ͝ͱʹNBYTDPSFΛอ࣋͠ ֤ϒϩοΫͷ۠੾ΓͷΠϯ
    λʔόϧʹ6QQFS#PVOE4DPSF 6#4
    Λܭࢉ͓ͯ͘͠ɻ͜Ε
    ʹΑΓϒϩοΫղౚΛεΩοϓͰ͖Δɻ
    TFBSDI
    FOHJOF
    %PDVNFOU
    ◾◾◾◾◾◾
    ◾◾◾◾
    NBY
    NBY NBY NBY
    NBY

    6#4

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  15. $PODMVTJPO
    5PQLTFMFDUJPOͰ͸ೋ෼ώʔϓͳͲͷσʔλߏ଄͕ར༻Ͱ͖Δɻ
    ݕࡧείΞʹ͓͚Δ֤λʔϜ͕ߩݙ͢ΔNBYTDPSF͸ࣄલʹܭࢉͰ͖ΔͷͰείΞܭࢉΛεΩοϓͰ͖Δɻ
    *OUFSWBMCBTFEQSVOJOHΛར༻͢Δ͜ͱͰѹॖΠϯσοΫε΋είΞܭࢉΛޮ཰తʹߦ͑Δɻ
    -VDFOFͰ͸ߋʹൃలܥͷ8"/%ͱ͍͏ΞϧΰϦζϜ͕ಋೖ͞Ε͍ͯΔɻ

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  16. ࢀߟ
    -VDFOFͷ5PQLΫΤϦϓϩηογϯά࠷దԽ
    .BY4DPSFΞϧΰϦζϜฤ
    IUUQTMJOLNFEJVNDPN&I%"D$HRKDC
    0LBQJ#.
    IUUQTKBXJLJQFEJBPSHXJLJ0LBQJ@#.
    ৘ใݕࡧݕࡧΤϯδϯͷ࣮૷ͱධՁ
    UUQTXXXBNB[PODPKQEQSFGDN@TX@FN@S@NU@EQ@$H'C&;7('9

    View Slide

  17. The first step of
    the Top-k algorithm
    in search
    M3 tecktalk
    #164
    hiromu-nakamura @po3rin

    View Slide