Transcription of 潜在トピックモデルに ... - latent-dynamics.net
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潜在トピックモデルに ... - latent-dynamics.net
1 2 3 D. Blei, A. Ng, M. Jordan, Latent dirichlet allocation , JMLR2003 4 D. Blei, J. Lafferty, Dynamic Topic Models, ICML20065 [L. Cao and L. Fei-Fei. Spatially coherent latent topic model for concurrent object segmentation and classification . ICCV2007]6 7bag-of-word W W 1w2w3w4w5w6w7w8w w8 1()( )NnnPPw== w w ()Pw9 1()() (|)NnznPPzPw z== w (|)Pw z ()Pzzw 10 1()(|)( |)NnznPPz Pw z == w (|)Pw z(|)Pz zw 11 PLSA LDA PLSA =PLSI : Probabilistic Latent Semantic Analysis LDA: Latent dirichlet allocation PLSA+ 1() ()(|)( |)NnznPPPzPwzd == w1()(|)( |)NnznPPz Pw z == w 12 D.
26 • Latent Dirichlet Allocation (LDA) • 多項分布パラメータφとθに対称ディリクレ事前分布を仮定 – 推定がロバストに
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