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function engine = set_params(engine, varargin)
% SET_PARAMS Set the parameters (fields) for a belprop_inf_engine object
% engine = set_params(engine, name/value pairs)
%
% The following optional arguments can be specified in the form of name/value pairs:
% e.g., engine = set_params(engine, 'tol', 1e-2, 'max_iter', 10)
%
% max_iter - max. num. loopy iterations
% momentum - weight assigned to old message in convex combination
% tol - tolerance used to assess convergence
% maximize - 1 means use max-product, 0 means use sum-product
args = varargin{1};
nargs = length(args);
for i=1:2:nargs
switch args{i},
case 'max_iter', engine.max_iter = args{i+1};
case 'momentum', engine.momentum = args{i+1};
case 'tol', engine.tol = args{i+1};
case 'maximize', engine.maximize = args{i+1};
otherwise,
error(['invalid argument name ' args{i}]);
end
end
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