Mercurial > hg > camir-aes2014
comparison toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/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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-1:000000000000 | 0:e9a9cd732c1e |
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1 function L = log_prob_node(CPD, self_ev, pev) | |
2 % LOG_PROB_NODE Compute sum_m log P(x(i,m)| x(pi_i,m), theta_i) for node i (discrete) | |
3 % L = log_prob_node(CPD, self_ev, pev) | |
4 % | |
5 % self_ev(m) is the evidence on this node in case m. | |
6 % pev(i,m) is the evidence on the i'th parent in case m (if there are any parents). | |
7 % (These may also be cell arrays.) | |
8 | |
9 [P, p] = prob_node(CPD, self_ev, pev); % P may underflow, so we use p | |
10 tiny = exp(-700); | |
11 p = p + (p==0)*tiny; % replace 0s by tiny | |
12 L = sum(log(p)); |