comparison toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@pearl_unrolled_dbn_inf_engine/enter_evidence.m @ 0:e9a9cd732c1e tip

first hg version after svn

+function [engine, loglik, niter] = enter_evidence(engine, evidence, varargin)
+% ENTER_EVIDENCE Add the specified evidence to the network (loopy_unrolled_dbn)
+% [engine, loglik, niter] = enter_evidence(engine, evidence, ....)
+%
+% evidence{i,t} = [] if if X(i,t) is hidden, and otherwise contains its observed value (scalar or column vector)
+%
+% The following optional arguments can be specified in the form of name/value pairs:
+% [default value in brackets]
+%
+% maximize - if 1, does max-product (not yet supported), else sum-product [0]
+% filename - as in loopy_pearl
+%
+% e.g., engine = enter_evidence(engine, ev, 'maximize', 1)
+
+maximize = 0;
+filename = engine.filename;
+
+if nargin >= 2
+  args = varargin;
+  nargs = length(args);
+  for i=1:2:nargs
+    switch args{i},
+     case 'maximize', maximize = args{i+1};
+     case 'filename', filename = args{i+1};
+    end
+  end
+end
+
+
+[ss T] = size(evidence);
+if T ~= engine.T
+  bnetT = dbn_to_bnet(bnet_from_engine(engine), T);
+  engine.unrolled_engine = pearl_inf_engine(bnetT, 'protocol', engine.protocol, ...
+					    'max_iter', engine.max_iter_per_slice * T, ...
+					    'tol', engine.tol, 'momentum', engine.momentum);
+  engine.T = T;
+end
+[engine.unrolled_engine, loglik, niter] = enter_evidence(engine.unrolled_engine, evidence(:), ...
+						  'maximize', maximize, 'filename', filename);
+
+