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