diff toolboxes/FullBNT-1.0.7/bnt/inference/online/@jtree_sparse_2TBN_inf_engine/fwd.m @ 0:e9a9cd732c1e tip

first hg version after svn

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/FullBNT-1.0.7/bnt/inference/online/@jtree_sparse_2TBN_inf_engine/fwd.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,47 @@
+function [f, logscale] = fwd(engine, fpast, ev, t)
+% Forwards pass.
+
+bnet = bnet_from_engine(engine);
+ss = bnet.nnodes_per_slice;
+
+ev2 = cell(ss, 2);
+ev2(:,1) = fpast.evidence;
+ev2(:,2) = ev;
+CPDpot = cell(1,ss);
+for n=1:ss
+  fam = family(bnet.dag, n, 2);
+  e = bnet.equiv_class(n, 2);
+  CPDpot{n} = convert_to_pot(bnet.CPD{e}, engine.pot_type, fam(:), ev2);
+end       
+f.evidence = ev;
+f.t = t;
+
+% get prior
+int = engine.interface;
+if fpast.t==1
+  prior = marginalize_pot(fpast.clpot{engine.int_clq1}, int, engine.maximize);
+else
+  prior = marginalize_pot(fpast.clpot{engine.out_clq}, int+ss, engine.maximize);
+  prior = set_domain_pot(prior, int); % shift back to slice 1
+end
+
+pots = [ {prior} CPDpot ];
+slice1 = 1:ss;
+slice2 = slice1 + ss; 
+CPDclqs = engine.clq_ass_to_node(slice2);
+D = engine.in_clq;
+clqs = [D CPDclqs];
+
+[f.clpot, f.seppot] =  init_pot(engine.jtree_engine, clqs, pots, engine.pot_type, engine.observed);
+[f.clpot, f.seppot] = collect_evidence(engine.jtree_engine, f.clpot, f.seppot);
+for c=1:length(f.clpot)
+  if isa(f.clpot{c}, 'struct')
+     domain = f.clpot{c}.domain;
+     sizes = f.clpot{c}.sizes;
+     T = f.clpot{c}.T;
+     f.clpot{c} = dpot(domain, sizes, T);
+  end
+  [f.clpot{c}, ll(c)] = normalize_pot(f.clpot{c});
+end
+logscale = ll(engine.root);
+