diff toolboxes/FullBNT-1.0.7/bnt/inference/online/@jtree_2TBN_inf_engine/jtree_2TBN_inf_engine.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_2TBN_inf_engine/jtree_2TBN_inf_engine.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,69 @@
+function engine = jtree_2TBN_inf_engine(bnet, varargin)
+% JTREE_ONLINE_INF_ENGINE Online Junction tree inference algorithm for DBNs.
+% engine = jtree_online_inf_engine(bnet, ...)
+%
+% The following optional arguments can be specified in the form of name/value pairs:
+% [default value in brackets]
+%
+% clusters - specifies variables that must be grouped in the 1.5 slice DBN
+%
+% The same nodes must be observed in every slice.
+%
+% This uses the forwards interface of slice t-1 plus all of slice t.
+% By contrast, jtree_dbn uses all of slice t-1 plus the backwards interface of slice t.
+% See my thesis for details.
+
+
+clusters = {};
+
+args = varargin;
+nargs = length(args);
+for i=1:2:length(args)
+  switch args{i},
+   case 'clusters', clusters = args{i+1};
+   otherwise, error(['unrecognized argument ' args{i}])
+  end
+end
+
+engine.maximize = 0;
+engine.evidence = [];
+engine.node_sizes = [];
+
+int = compute_fwd_interface(bnet.intra, bnet.inter);
+engine.interface = int;
+ss = length(bnet.intra);
+engine.nonint = mysetdiff(1:ss, int);
+onodes = bnet.observed;
+
+bnet15 = mk_slice_and_half_dbn(bnet, int);
+
+% use unconstrained elimination,
+% but force there to be a clique containing both interfaces
+clusters(end+1:end+2) = {int, int+ss};
+engine.jtree_engine = jtree_inf_engine(bnet15, 'clusters', clusters, 'root', int+ss);
+jtree_engine = struct(engine.jtree_engine); % violate object privacy
+
+engine.in_clq = clq_containing_nodes(engine.jtree_engine, int);
+engine.out_clq = clq_containing_nodes(engine.jtree_engine, int+ss);
+engine.clq_ass_to_node = jtree_engine.clq_ass_to_node;
+engine.root = jtree_engine.root_clq;
+
+% Also create an engine just for slice 1
+bnet1 = mk_bnet(bnet.intra1, bnet.node_sizes_slice, 'discrete', myintersect(bnet.dnodes,1:ss), ...
+		'equiv_class', bnet.equiv_class(:,1), 'observed', onodes);
+for i=1:max(bnet1.equiv_class)
+  bnet1.CPD{i} = bnet.CPD{i};
+end
+engine.jtree_engine1 = jtree_inf_engine(bnet1, 'clusters', {int}, 'root', int);
+jtree_engine1 = struct(engine.jtree_engine1); % violate object privacy
+engine.int_clq1 = clq_containing_nodes(engine.jtree_engine1, int);
+engine.clq_ass_to_node1 = jtree_engine1.clq_ass_to_node;
+engine.root1 = jtree_engine1.root_clq;
+
+engine.observed = [onodes onodes+ss];
+engine.observed1 = onodes;
+engine.pot_type = determine_pot_type(bnet, onodes);
+engine.slice_size = bnet.nnodes_per_slice;
+
+engine = class(engine, 'jtree_2TBN_inf_engine', inf_engine(bnet));
+