dbn_update_bel.m

来自「Bayes网络工具箱」· M 代码 · 共 14 行

function [engine, loglik] = dbn_update_bel(engine, evidence)
% DBN_UPDATE_BEL Update the belief state (hmm)
% [engine, loglik] = dbn_update(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);
engine.bel = newbel;
loglik = log(lik);