annotate toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/log_prob_node.m @ 0:cc4b1211e677
tip
initial commit to HG from
Changeset:
646 (e263d8a21543) added further path and more save "camirversion.m"
| author |
Daniel Wolff |
| date |
Fri, 19 Aug 2016 13:07:06 +0200 |
| parents |
|
| children |
|
| rev |
line source |
|
Daniel@0
|
1 function L = log_prob_node(CPD, self_ev, pev)
|
|
Daniel@0
|
2 % LOG_PROB_NODE Compute sum_m log P(x(i,m)| x(pi_i,m), theta_i) for node i (discrete)
|
|
Daniel@0
|
3 % L = log_prob_node(CPD, self_ev, pev)
|
|
Daniel@0
|
4 %
|
|
Daniel@0
|
5 % self_ev(m) is the evidence on this node in case m.
|
|
Daniel@0
|
6 % pev(i,m) is the evidence on the i'th parent in case m (if there are any parents).
|
|
Daniel@0
|
7 % (These may also be cell arrays.)
|
|
Daniel@0
|
8
|
|
Daniel@0
|
9 [P, p] = prob_node(CPD, self_ev, pev); % P may underflow, so we use p
|
|
Daniel@0
|
10 tiny = exp(-700);
|
|
Daniel@0
|
11 p = p + (p==0)*tiny; % replace 0s by tiny
|
|
Daniel@0
|
12 L = sum(log(p));
|
