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annotate toolboxes/FullBNT-1.0.7/bnt/inference/static/@jtree_inf_engine/Old/distribute_evidence.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 function engine = distribute_evidence(engine, root)
wolffd@0 2
wolffd@0 3 if isempty(engine.preorder{root})
wolffd@0 4 % this is the first time we have distributed from this root
wolffd@0 5 % memoize the order
wolffd@0 6 [jtree, preorder, postorder] = mk_rooted_tree(engine.jtree, root);
wolffd@0 7 preorder_children = cell(1,length(preorder));
wolffd@0 8 for n=preorder
wolffd@0 9 preorder_children{n} = children(jtree, n);
wolffd@0 10 end
wolffd@0 11 engine.preorder{root} = preorder;
wolffd@0 12 engine.preorder_children{root} = preorder_children;
wolffd@0 13 else
wolffd@0 14 preorder = engine.preorder{root};
wolffd@0 15 preorder_children = engine.preorder_children{root};
wolffd@0 16 end
wolffd@0 17
wolffd@0 18
wolffd@0 19 % distribute from root (node to children)
wolffd@0 20 for n=preorder(:)'
wolffd@0 21 for c=preorder_children{n}(:)'
wolffd@0 22 engine.clpot{c} = divide_by_pot(engine.clpot{c}, engine.seppot{n,c});
wolffd@0 23 engine.seppot{n,c} = marginalize_pot(engine.clpot{n}, engine.separator{n,c}, engine.maximize);
wolffd@0 24 engine.clpot{c} = multiply_by_pot(engine.clpot{c}, engine.seppot{n,c});
wolffd@0 25 end
wolffd@0 26 end