Mercurial > hg > camir-aes2014
view toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@ff_inf_engine/filter_evidence.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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function [fwd, loglik] = filter_evidence(engine, CPDpot, observed, pot_type) % [fwd, loglik] = filter_evidence(engine, CPDpot, observed, pot_type) (ff) [ss T] = size(CPDpot); fwd = cell(ss,T); hnodes = engine.hnodes(:)'; onodes = engine.onodes(:)'; bnet = bnet_from_engine(engine); ns = bnet.node_sizes; onodes2 = [onodes onodes+ss]; ns(onodes2) = 1; logscale = zeros(1,T); H = length(hnodes); local_logscale = zeros(1,ss); t = 1; for i=hnodes fwd{i,t} = CPDpot{i,t}; c = engine.obschild(i); if c > 0 fwd{i,t} = multiply_by_pot(fwd{i,t}, CPDpot{c, t}); end [fwd{i,t}, local_logscale(i)] = normalize_pot(fwd{i,t}); end logscale(t) = sum(local_logscale); for t=2:T for i=hnodes ps = parents(bnet.dag, i+ss); assert(all(ps<=ss)); % in previous slice prior = CPDpot{i,t}; for p=ps(:)' prior = multiply_by_pot(prior, fwd{p,t-1}); end fwd{i,t} = marginalize_pot(prior, i+ss); fwd{i,t} = set_domain_pot(fwd{i,t}, i); c = engine.obschild(i); if c > 0 fwd{i,t} = multiply_by_pot(fwd{i,t}, CPDpot{c,t}); end [fwd{i,t}, local_logscale(i)] = normalize_pot(fwd{i,t}); end logscale(t) = sum(local_logscale); end loglik = sum(logscale);