Mercurial > hg > camir-aes2014
comparison toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/Old/convert_to_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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children |
comparison
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-1:000000000000 | 0:e9a9cd732c1e |
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1 function pot = convert_to_pot(CPD, pot_type, domain, evidence) | |
2 % CONVERT_TO_POT Convert a tabular CPD to one or more potentials | |
3 % pots = convert_to_pot(CPD, pot_type, domain, evidence) | |
4 % | |
5 % pots{i} = CPD evaluated using evidence(domain(:,i)) | |
6 % If 'domains' is a single row vector, pots will be an object, not a cell array. | |
7 | |
8 ncases = size(domain,2); | |
9 assert(ncases==1); % not yet vectorized | |
10 | |
11 sz = dom_sizes(CPD); | |
12 ns = zeros(1, max(domain)); | |
13 ns(domain) = sz; | |
14 | |
15 local_ev = evidence(domain); | |
16 obs_bitv = ~isemptycell(local_ev); | |
17 odom = domain(obs_bitv); | |
18 T = convert_to_table(CPD, domain, local_ev, obs_bitv); | |
19 | |
20 switch pot_type | |
21 case 'u', | |
22 pot = upot(domain, sz, T, 0*myones(sz)); | |
23 case 'd', | |
24 ns(odom) = 1; | |
25 pot = dpot(domain, ns(domain), T); | |
26 case {'c','g'}, | |
27 % Since we want the output to be a Gaussian, the whole family must be observed. | |
28 % In other words, the potential is really just a constant. | |
29 p = T; | |
30 %p = prob_node(CPD, evidence(domain(end)), evidence(domain(1:end-1))); | |
31 ns(domain) = 0; | |
32 pot = cpot(domain, ns(domain), log(p)); | |
33 case 'cg', | |
34 T = T(:); | |
35 ns(odom) = 1; | |
36 can = cell(1, length(T)); | |
37 for i=1:length(T) | |
38 can{i} = cpot([], [], log(T(i))); | |
39 end | |
40 pot = cgpot(domain, [], ns, can); | |
41 otherwise, | |
42 error(['unrecognized pot type ' pot_type]) | |
43 end | |
44 |