Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/bnt/inference/online/@jtree_2TBN_inf_engine/back.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/online/@jtree_2TBN_inf_engine/back.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,27 @@ +function b = back(engine, bfuture, f, t) + +if f.t ~= t + error('mixed up time stamps') +end +if t==1 + b = back1(engine, bfuture, f, t); + return; +end + +bnet = bnet_from_engine(engine); +ss = bnet.nnodes_per_slice; + +int = engine.interface; +D = engine.in_clq; +C = engine.out_clq; +phiD = marginalize_pot(bfuture.clpot{D}, int, engine.maximize); +phiD = set_domain_pot(phiD, int+ss); % shift to slice 2 +phiC = marginalize_pot(f.clpot{C}, int+ss, engine.maximize); +ratio = divide_by_pot(phiD, phiC); +f.clpot{C} = multiply_by_pot(f.clpot{C}, ratio); + +[b.clpot, seppot] = distribute_evidence(engine.jtree_engine, f.clpot, f.seppot); +for c=1:length(b.clpot) + [b.clpot{c}, ll(c)] = normalize_pot(b.clpot{c}); +end +b.t = t;