Mercurial > hg > camir-aes2014
annotate toolboxes/FullBNT-1.0.7/bnt/inference/static/@cond_gauss_inf_engine/marginal_nodes.m @ 0:e9a9cd732c1e tip
first hg version after svn
author | wolffd |
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date | Tue, 10 Feb 2015 15:05:51 +0000 |
parents | |
children |
rev | line source |
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wolffd@0 | 1 function marginal = marginal_nodes(engine, query, add_ev) |
wolffd@0 | 2 % MARGINAL_NODES Compute the marginal on the specified query nodes (cond_gauss) |
wolffd@0 | 3 % marginal = marginal_nodes(engine, query, add_ev) |
wolffd@0 | 4 % |
wolffd@0 | 5 % 'query' must be a singleton set |
wolffd@0 | 6 % add_ev is an optional argument; if 1, we will "inflate" the marginal of observed nodes |
wolffd@0 | 7 % to their original size, adding 0s to the positions which contradict the evidence |
wolffd@0 | 8 |
wolffd@0 | 9 if nargin < 3, add_ev = 0; end |
wolffd@0 | 10 |
wolffd@0 | 11 if length(query) ~= 1 |
wolffd@0 | 12 error('cond_gauss_inf_engine can only handle marginal queries on single nodes') |
wolffd@0 | 13 end |
wolffd@0 | 14 j = query; |
wolffd@0 | 15 bnet = bnet_from_engine(engine); |
wolffd@0 | 16 |
wolffd@0 | 17 if myismember(j, bnet.cnodes) |
wolffd@0 | 18 if ~myismember(j, engine.onodes) |
wolffd@0 | 19 [m, C] = collapse_mog(engine.mu{j}, engine.Sigma{j}, engine.T); |
wolffd@0 | 20 marginal.mu = m; |
wolffd@0 | 21 marginal.Sigma = C; |
wolffd@0 | 22 marginal.T = 1.0; % single mixture component |
wolffd@0 | 23 else |
wolffd@0 | 24 marginal.mu = engine.evidence{j}; |
wolffd@0 | 25 k = bnet.node_sizes(j); |
wolffd@0 | 26 marginal.Sigma = zeros(k,k); |
wolffd@0 | 27 marginal.T = 1.0; % since P(E|E)=1 |
wolffd@0 | 28 end |
wolffd@0 | 29 else |
wolffd@0 | 30 marginal = pot_to_marginal(marginalize_pot(engine.joint_dmarginal, j)); |
wolffd@0 | 31 if add_ev |
wolffd@0 | 32 marginal = add_ev_to_dmarginal(marginal, engine.evidence, bnet.node_sizes); |
wolffd@0 | 33 end |
wolffd@0 | 34 end |
wolffd@0 | 35 |
wolffd@0 | 36 marginal.domain = query; |