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}])  endendengine.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 interfacesclusters(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 privacyengine.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 1bnet1 = 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};endengine.jtree_engine1 = jtree_inf_engine(bnet1, 'clusters', {int}, 'root', int);jtree_engine1 = struct(engine.jtree_engine1); % violate object privacyengine.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));