Mercurial > hg > camir-aes2014
comparison toolboxes/FullBNT-1.0.7/bnt/CPDs/@tabular_CPD/log_prior.m @ 0:e9a9cd732c1e tip
first hg version after svn
author | wolffd |
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date | Tue, 10 Feb 2015 15:05:51 +0000 |
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children |
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-1:000000000000 | 0:e9a9cd732c1e |
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1 function L = log_prior(CPD) | |
2 % LOG_PRIOR Return log P(theta) for a tabular CPD | |
3 % L = log_prior(CPD) | |
4 | |
5 switch CPD.prior_type | |
6 case 'none', | |
7 L = 0; | |
8 case 'dirichlet', | |
9 D = CPD.dirichlet(:); | |
10 L = sum(log(D + (D==0))); | |
11 case 'entropic', | |
12 % log-prior = log exp(-H(theta)) = sum_i theta_i log (theta_i) | |
13 fam_sz = CPD.sizes; | |
14 psz = prod(fam_sz(1:end-1)); | |
15 ssz = fam_sz(end); | |
16 C = reshape(CPD.CPT, psz, ssz); | |
17 L = sum(sum(C .* log(C + (C==0)))); | |
18 end |