Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/bnt/CPDs/@gaussian_CPD/Old/log_prob_node.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/CPDs/@gaussian_CPD/Old/log_prob_node.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,59 @@ +function L = log_prob_node(CPD, self_ev, pev) +% LOG_PROB_NODE Compute prod_m log P(x(i,m)| x(pi_i,m), theta_i) for node i (gaussian) +% L = log_prob_node(CPD, self_ev, pev) +% +% self_ev(m) is the evidence on this node in case m. +% pev(i,m) is the evidence on the i'th parent in case m (if there are any parents). +% (These may also be cell arrays.) + +if iscell(self_ev), usecell = 1; else usecell = 0; end + +use_log = 1; +ncases = length(self_ev); +nparents = length(CPD.sizes)-1; +assert(ncases == size(pev, 2)); + +if ncases == 0 + L = 0; + return; +end + +if length(CPD.dps)==0 % no discrete parents, so we can vectorize + i = 1; + if usecell + Y = cell2num(self_ev); + else + Y = self_ev; + end + if length(CPD.cps) == 0 + L = gaussian_prob(Y, CPD.mean(:,i), CPD.cov(:,:,i), use_log); + else + if usecell + X = cell2num(pev); + else + X = pev; + end + L = gaussian_prob(Y, CPD.mean(:,i) + CPD.weights(:,:,i)*X, CPD.cov(:,:,i), use_log); + end +else % each case uses a (potentially) different set of parameters + L = 0; + for m=1:ncases + if usecell + dpvals = cat(1, pev{CPD.dps, m}); + else + dpvals = pev(CPD.dps, m); + end + i = subv2ind(CPD.sizes(CPD.dps), dpvals(:)'); + y = self_ev{m}; + if length(CPD.cps) == 0 + L = L + gaussian_prob(y, CPD.mean(:,i), CPD.cov(:,:,i), use_log); + else + if usecell + x = cat(1, pev{CPD.cps, m}); + else + x = pev(CPD.cps, m); + end + L = L + gaussian_prob(y, CPD.mean(:,i) + CPD.weights(:,:,i)*x, CPD.cov(:,:,i), use_log); + end + end +end