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τϐοΫϞσϧʹΑΔ౷ܭతજࡏҙຯ ղੳ 3ষ ֶशΞϧΰϦζϜ(3.2.3 ~ 3.2.4) Yoshifumi Seki GunosyσʔλϚΠχϯάݚڀձ #98 2016.01.06
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3.2.3 LDAͷΪϒεαϯϓϦϯά ·ͣLDAͷશ֬มͷ݁߹Λߟ͑Δ ͔͜͜Βؔͷͳ͍߲Λফͯ͠αϯϓϧͷੜΛߦ͏
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จॻ ʹ͓͚Δ ൪ͷજࡏม
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จॻ ʹ͓͚Δ ൪ͷજࡏม ͱͳΔΑ͏ʹਖ਼نԽ͢Δͱ ϙΠϯτ • ΛऔΓͬͯൺྫʹ͍ͯ͠ΔͷͰ, ૯͕1ʹͳΔΑ͏ʹઃఆ͢Ε֬ʹͰ͖Δ
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ͷ͖݅ಠཱੑ άϥϑΟΧϧϞσϧΑΓ, ʹͷΈґଘ͕ؔ͋ Δɽ (3.29)͜ͷ݅Λຬ͍ͨͯ͠Δɽ
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ͷαϯϓϦϯά
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ͷαϯϓϦϯά Λ༻͍Δͱ • σΟϦΫϨͷࣄޙͳͷͰσΟϦΫϨͷܗʹͳΔΑ͏ʹ͍ͨ͠ɽ • ͳͷͰ૯Ͱද͢͜ͱ͕Ͱ͖ΔΑ͏ʹࣜมܗ͍ͯ͠Δ
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ͷαϯϓϦϯά (2.11)ΑΓ Diricheletʹै͏ͷͰ
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ͷαϯϓϦϯά
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ͷαϯϓϦϯά Ҏ্͔Β
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ͷαϯϓϦϯά (2.11)ΑΓ Diricheletʹै͏ͷͰ
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ΪϒεαϯϓϦϯάʹΑΔಋग़
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3.2.4 LDAͷपลԽΪϒεαϯϓϦϯά จॻ ͰજࡏτϐοΫ ͕ݱΕͨ୯ޠ શจॻʹରͯ͠τϐοΫ ͕୯ޠ ʹରͯ͠ਪఆ͞Εͨؔ
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ʹ͓͚ΔपลԽ
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ʹ͓͚ΔपลԽ ΑΓ
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ʹ͓͚ΔपลԽ σΟϦΫϨͳͷͰ, σΟϦΫϨͷظͱͯ͠ܭࢉ͢Δ
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