Mercurial > hg > camir-aes2014
diff 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 |
---|---|
date | Tue, 10 Feb 2015 15:05:51 +0000 |
parents | |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@bk_ff_hmm_inf_engine/dbn_update_bel.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,19 @@ +function [engine, loglik] = dbn_update_bel(engine, evidence) +% DBN_UPDATE_BEL Update the belief state (bk_ff_hmm) +% [engine, loglik] = dbn_update_bel(engine, evidence) +% +% evidence{i,1} contains the evidence on node i in slice t-1 +% evidence{i,2} contains the evidence on node i in slice t + +oldbel = engine.bel; +bnet = bnet_from_engine(engine); +obslik = mk_hmm_obs_lik_vec(bnet, evidence); +[newbel, lik] = normalise((engine.transmat' * oldbel) .* obslik); +loglik = log(lik); + +hnodes = engine.hnodes; +ns = bnet.node_sizes; +[marginals, marginalsT] = project_joint_onto_marginals(newbel, hnodes, ns); +newbel = combine_marginals_into_joint(marginalsT, hnodes, ns); +engine.bel_marginals = marginalsT; +engine.bel = newbel;