diff toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@pearl_dbn_inf_engine/pearl_dbn_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/dynamic/@pearl_dbn_inf_engine/pearl_dbn_inf_engine.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,65 @@
+function engine = pearl_dbn_inf_engine(bnet, varargin)
+% LOOPY_DBN_INF_ENGINE Loopy Pearl version of forwards-backwards
+% engine = loopy_dbn_inf_engine(bnet, ...)
+%
+% Optional arguments
+% 'max_iter' - specifies the max num. forward-backward passes to perform [1]
+% 'tol' - as in loopy_pearl [1e-3]
+% 'momentum' - as in loopy_pearl [0]
+
+error('pearl_dbn does not work yet')
+
+max_iter = 1;
+tol = 1e-3;
+momentum = 0;
+
+if nargin >= 2
+  args = varargin;
+  nargs = length(args);
+  for i=1:2:nargs
+    switch args{i},
+     case 'max_iter', max_iter = args{i+1};
+     case 'tol', tol = args{i+1};
+     case 'momentum', momentum = args{i+1};
+    end
+  end
+end
+
+          
+engine.max_iter = max_iter;
+engine.tol = tol;
+engine.momentum = momentum;
+engine.pearl_engine = [];
+engine.T = [];
+engine.ss = length(bnet.intra);
+
+engine.marginal = [];
+engine.evidence = [];
+engine.msg = [];
+engine.parent_index = [];
+engine.child_index = [];
+%[engine.parent_index, engine.child_index] = mk_pearl_msg_indices(bnet); % need to unroll first
+
+ss = length(bnet.intra);
+engines.ss = ss;
+onodes = bnet.observed;
+hnodes = mysetdiff(1:ss, onodes);
+obschild = zeros(1,ss);
+for i=hnodes(:)'
+  %ocs = myintersect(children(bnet.dag, i), onodes);
+  ocs = children(bnet.intra, i);
+  assert(length(ocs) <= 1);
+  if length(ocs)==1
+    obschild(i) = ocs(1);
+  end
+end
+engine.obschild = obschild;
+
+engine.mult_self_ndx = [];
+engine.mult_parent_ndx = [];
+engine.marg_self_ndx = [];
+engine.marg_parent_ndx = [];
+
+
+engine = class(engine, 'loopy_dbn_inf_engine', inf_engine(bnet));
+