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1 function [engine, loglik, niter] = enter_evidence(engine, evidence, varargin)
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2 % ENTER_EVIDENCE Add the specified evidence to the network (loopy_unrolled_dbn)
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3 % [engine, loglik, niter] = enter_evidence(engine, evidence, ....)
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4 %
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5 % evidence{i,t} = [] if if X(i,t) is hidden, and otherwise contains its observed value (scalar or column vector)
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6 %
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7 % The following optional arguments can be specified in the form of name/value pairs:
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8 % [default value in brackets]
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9 %
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10 % maximize - if 1, does max-product (not yet supported), else sum-product [0]
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11 % filename - as in loopy_pearl
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12 %
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13 % e.g., engine = enter_evidence(engine, ev, 'maximize', 1)
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14
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15 maximize = 0;
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16 filename = engine.filename;
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17
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18 if nargin >= 2
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19 args = varargin;
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20 nargs = length(args);
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21 for i=1:2:nargs
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22 switch args{i},
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23 case 'maximize', maximize = args{i+1};
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24 case 'filename', filename = args{i+1};
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25 end
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26 end
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27 end
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28
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29
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30 [ss T] = size(evidence);
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31 if T ~= engine.T
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32 bnetT = dbn_to_bnet(bnet_from_engine(engine), T);
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33 engine.unrolled_engine = pearl_inf_engine(bnetT, 'protocol', engine.protocol, ...
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34 'max_iter', engine.max_iter_per_slice * T, ...
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35 'tol', engine.tol, 'momentum', engine.momentum);
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36 engine.T = T;
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37 end
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38 [engine.unrolled_engine, loglik, niter] = enter_evidence(engine.unrolled_engine, evidence(:), ...
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39 'maximize', maximize, 'filename', filename);
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40
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41
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