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One application of LDA in machine learning - specifically, topic discovery, a subproblem in natural language processing â is to discover topics in a collection of documents, and then automatically classify any individual document within the collection in terms of how "relevant" it is to each of the discovered topics. A topic is considered to be a set of terms (i.e., individual words or phrases) th
probabilistic latent semantic analysis (pLSA)â ææ¸ã¨åèªãªã©ï¼é¢æ£2å¤æ°ã®è¨æ°ãã¼ã¿ã®çæã¢ãã«ï¼ ææ¸(document)ï¼\(d\in\mathcal{D}=\{d_1,\ldots,d_N\}\)ï¼ èª(word)ï¼\(w\in\mathcal{W}=\{w_1,\ldots,w_M\}\)ï¼ æ½å¨å¤æ°ã®è©±é¡(topic)ï¼\(z\in\mathcal{Z}=\{z_1,\ldots,z_K\}\) ã使ã£ãææ¸ã¨åèªã®çæã¢ãã«ãpLSA (probabilistic latent semantic analysis) \[\Pr[d,w]=\Pr[d]\sum_{z\in\mathcal{Z}}\Pr[w|z]\Pr[z|d]\] ããã¯ï¼ææ¸ã¨èªã«ã¤ãã¦å¯¾ç§°ã«å®ç¾©ãããã¨ãã§ãã \[\Pr[d,w]=\sum_{z\in\mat
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ããããGibbs Samplingã«ã¤ãã¦ã®ã¡ã¢ã§ãã æç§æ¸ãªã©ã§ã¯ãã®ãã¹ãµã³ãã©ã¼ãã¨æ¸ããã¦ããæ¹ãå¤ãã®ã§ããã ç§ã¯Gibbs Samplingã§ç¿ã£ãã®ã§ããã§ã¯ããã§éãã¾ãã ãGibbs Samplingã®æé ã #include <stdlib.h> #include <stdio.h> #include <math.h> #include "randlib.h" int main( void ) { // æ¯éå£ã®å¹³åå¤ double trueMean = 5.0; // æ¯éå£ã®åæ£ double trueVar = 1.0; // 観測å¤æ° int dataNum = 1000; // 観測å¤æ ¼ç´å double y[dataNum]; // 観測å¤ã®å¹³å double xbar = 0.0; // 観測å¤ã®åæ£ double xvar = 0.0; // äº
å¼ãç¶ãããã¿ã¼ã³èªèã¨æ©æ¢°å¦ç¿ã(PRML) 11ç« äºç¿ä¸ã Gibbs ãµã³ããªã³ã°ãããã¯ãã試ãã¦ã¿ãããã syou6162 ããã試ãã¦ã¯ãã®( http://d.hatena.ne.jp/syou6162/20090115/1231965900 )ããªããã ãã§ããããã ãã©ããã£ããã ããå¤æ¬¡å ä¸è¬åãããã r_mul_norm1 <- function(x, mu, Sig) { idx <- 1:length(mu); for(a in idx) { b <- idx[idx!=a]; # b = [1,D] - a s <- Sig[b,a] %*% solve(Sig[b,b]); # Σ_ab Σ_bb ^ -1 # (PRML 2.81) μ_a|b = μ_a + Σ_ab Σ_bb ^ -1 (x_b - μ_b) mu_a_b <- mu[a] + s
Latent Dirichlet Allocationã¯ããã¹ãã®ãããªä¸é£ç¶ãã¼ã¿ã®ããã®çæç確çã¢ãã«ãå ¥åã¯ããã¥ã¡ã³ããåºåã¯ããã¥ã¡ã³ããç¹å¾´ã¥ããä½ãï¼tf-idfã¿ãããªããï¼ã åºæ¬çãªã¢ã¤ãã£ã¢ã¯ãããããã¥ã¡ã³ãã¯æ½å¨çãªããã¤ãã®ãããã¯ãæ··åãã¦ãã¦ãããããã®ãããã¯ã¯èªã®åå¸ã§ç¹å¾´ã¥ãããã¦ãããã¨ãããã¨ã è«æ[1]ã§ã¯Î±ã¨Î²ã¨ãããã©ã¡ã¼ã¿ãç¨ãã¦ããã¥ã¡ã³ãã以ä¸ã®ããã«çæãããã¨ä»®å®ãã¦ããã ããã¥ã¡ã³ãã®ãããã¯ã®åå¸Î¸ããã£ãªã¯ã¬åå¸Dir(α)ã«åºã¥ãã¦é¸ã°ããã ããã¥ã¡ã³ãã®èªæ°Nåã«ãªãã¾ã§ä»¥ä¸ãç¹°ãè¿ãã ãããã¯znãå¤é åå¸Mult(θ)ã«åºã¥ãã¦é¸ã°ããã åèªwnã確çp(wn|zn,β)ã§é¸ã°ããã ãã ãããããã¯zã®æ°ãkåãåèªwã®ç¨®é¡ãVåã¨ããã¨ããã©ã¡ã¼ã¿Î±ã¯k次å ã®ãã¯ãã«ãβã¯k x V次å ã®è¡åã§Î²ij=
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