Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@ff_inf_engine/Old/enter_soft_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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@ff_inf_engine/Old/enter_soft_evidence.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,59 @@ +function [marginals, loglik] = enter_soft_evidence(engine, CPDpot, observed, pot_type, filter) +% ENTER_SOFT_EVIDENCE Add the specified soft evidence to the network (bk_ff) +% [marginals, loglik] = enter_soft_evidence(engine, CPDpot, observed, pot_type, filter) + +assert(pot_type == 'd'); +[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); +local_logscale = zeros(1,length(hnodes)); + +t = 1; +for i=hnodes + fwd{i,t} = CPDpot{i,t}; +end +for i=onodes + p = parents(bnet.dag, i); + assert(length(p)==1); + ev = marginalize_pot(CPDpot{i,t}, p); + fwd{p,t} = multiply_by_pot(fwd{p,t}, ev); +end +for i=hnodes + [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); + end + for i=onodes + p = parents(bnet.dag, i); + assert(length(p)==1); + temp = pot_to_marginal(CPDpot{i,t}); + ev = dpot(p, ns(p), temp.T); + fwd{p,t} = multiply_by_pot(fwd{p,t}, ev); + end + + for i=hnodes + [fwd{i,t}, local_logscale(i)] = normalize_pot(fwd{i,t}); + end + logscale(t) = sum(local_logscale); +end + +marginals = fwd; +loglik = sum(logscale);