Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/bnt/potentials/@cgpot/normalize_pot.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/potentials/@cgpot/normalize_pot.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,24 @@ +function [pot, loglik] = normalize_pot(pot) +% NORMALIZE_POT Convert the CG potential Pr(X,E) into Pr(X|E) and return log Pr(E). +% [pot, loglik] = normalize_pot(pot) + +% Marginalize down to [], so that the normalizing constant becomes Pr(E) +temp = cg_can_to_mom(marginalize_pot(pot, [])); +%loglik = temp.mom{1}.logp; +[temp2, loglik] = normalize_pot(temp.mom{1}); + +% Adjust scale factor to reflect the fact that the pot now represents Pr(X | E) instead of Pr(X,E). + +scale = -loglik; +if 1 +switch pot.subtype + case 'm' + for i=1:pot.dsize + pot.mom{i} = rescale_pot(pot.mom{i}, scale); + end + case 'c' + for i=1:pot.dsize + pot.can{i} = rescale_pot(pot.can{i}, scale); + end +end +end