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トピックモデルによる統計的潜在意味解析 3.2.3 ~ 3.2.4 / topic-model...
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ysekky
January 07, 2016
Research
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トピックモデルによる統計的潜在意味解析 3.2.3 ~ 3.2.4 / topic-model-3-2-3
ysekky
January 07, 2016
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Transcript
τϐοΫϞσϧʹΑΔ౷ܭతજࡏҙຯ ղੳ 3ষ ֶशΞϧΰϦζϜ(3.2.3 ~ 3.2.4) Yoshifumi Seki GunosyσʔλϚΠχϯάݚڀձ #98
2016.01.06
3.2.3 LDAͷΪϒεαϯϓϦϯά ·ͣLDAͷશ֬มͷ݁߹Λߟ͑Δ ͔͜͜Βؔͷͳ͍߲Λফͯ͠αϯϓϧͷੜΛߦ͏
จॻ ʹ͓͚Δ ൪ͷજࡏม
จॻ ʹ͓͚Δ ൪ͷજࡏม ͱͳΔΑ͏ʹਖ਼نԽ͢Δͱ ϙΠϯτ • ΛऔΓͬͯൺྫʹ͍ͯ͠ΔͷͰ, ૯͕1ʹͳΔΑ͏ʹઃఆ͢Ε֬ʹͰ͖Δ
ͷ͖݅ಠཱੑ άϥϑΟΧϧϞσϧΑΓ, ʹͷΈґଘ͕ؔ͋ Δɽ (3.29)͜ͷ݅Λຬ͍ͨͯ͠Δɽ
ͷαϯϓϦϯά
ͷαϯϓϦϯά Λ༻͍Δͱ • σΟϦΫϨͷࣄޙͳͷͰσΟϦΫϨͷܗʹͳΔΑ͏ʹ͍ͨ͠ɽ • ͳͷͰ૯Ͱද͢͜ͱ͕Ͱ͖ΔΑ͏ʹࣜมܗ͍ͯ͠Δ
ͷαϯϓϦϯά (2.11)ΑΓ Diricheletʹै͏ͷͰ
ͷαϯϓϦϯά
ͷαϯϓϦϯά Ҏ্͔Β
ͷαϯϓϦϯά (2.11)ΑΓ Diricheletʹै͏ͷͰ
ΪϒεαϯϓϦϯάʹΑΔಋग़
3.2.4 LDAͷपลԽΪϒεαϯϓϦϯά จॻ ͰજࡏτϐοΫ ͕ݱΕͨ୯ޠ શจॻʹରͯ͠τϐοΫ ͕୯ޠ ʹରͯ͠ਪఆ͞Εͨؔ
ʹ͓͚ΔपลԽ
ʹ͓͚ΔपลԽ ΑΓ
ʹ͓͚ΔपลԽ σΟϦΫϨͳͷͰ, σΟϦΫϨͷظͱͯ͠ܭࢉ͢Δ
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