Mercurial > hg > camir-aes2014
comparison toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@bk_ff_hmm_inf_engine/dbn_update_bel.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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-1:000000000000 | 0:e9a9cd732c1e |
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1 function [engine, loglik] = dbn_update_bel(engine, evidence) | |
2 % DBN_UPDATE_BEL Update the belief state (bk_ff_hmm) | |
3 % [engine, loglik] = dbn_update_bel(engine, evidence) | |
4 % | |
5 % evidence{i,1} contains the evidence on node i in slice t-1 | |
6 % evidence{i,2} contains the evidence on node i in slice t | |
7 | |
8 oldbel = engine.bel; | |
9 bnet = bnet_from_engine(engine); | |
10 obslik = mk_hmm_obs_lik_vec(bnet, evidence); | |
11 [newbel, lik] = normalise((engine.transmat' * oldbel) .* obslik); | |
12 loglik = log(lik); | |
13 | |
14 hnodes = engine.hnodes; | |
15 ns = bnet.node_sizes; | |
16 [marginals, marginalsT] = project_joint_onto_marginals(newbel, hnodes, ns); | |
17 newbel = combine_marginals_into_joint(marginalsT, hnodes, ns); | |
18 engine.bel_marginals = marginalsT; | |
19 engine.bel = newbel; |