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is_valid_hmm.m
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is_valid_hmm.m
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function out = is_valid_hmm(hmm, verb)
% y = is_valid_hmm(hmm)
%
% Returns 1 if and only if hmm is a valid HMM structure
%
% 2008-06-03 [email protected]
% Copyright (C) 2008 Ron J. Weiss
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
if nargin < 2; verb = 0; end
out = true;
if ~isstruct(hmm)
out = false;
if verb; fprintf('is_valid_hmm: not a structure\n'); end
return
end
if ~isfield(hmm, 'nstates')
out = false;
if verb; fprintf('is_valid_hmm: missing nstates field\n'); end
return
end
if ~isfield(hmm, 'emission_type')
out = false;
if verb; fprintf('is_valid_hmm: missing emissionn type field\n'); end
end
if ~isfield(hmm, 'start_prob')
out = false;
if verb; fprintf('is_valid_hmm: missing start_prob field\n'); end
else
if length(hmm.start_prob) ~= hmm.nstates
out = false;
if verb; fprintf('is_valid_hmm: start_prob field is wrong length\n'); end
end
if abs(logsum(hmm.start_prob)) > 1e-3
out = false;
if verb; fprintf('is_valid_hmm: start_prob doesn''t sum to 1\n'); end
end
end
if ~isfield(hmm, 'end_prob')
out = false;
if verb; fprintf('is_valid_hmm: missing end_prob field\n'); end
else
if length(hmm.end_prob) ~= hmm.nstates
out = false;
if verb; fprintf('is_valid_hmm: end_prob field is wrong length\n'); end
end
if ~isfield(hmm, 'transmat')
out = false;
if verb; fprintf('is_valid_hmm: missing transmat field\n'); end
else
if ~all(size(hmm.transmat) == [hmm.nstates hmm.nstates])
out = false;
if verb; fprintf('is_valid_hmm: transmat is wrong size\n'); end
end
if ~all(abs(sum(exp(hmm.transmat), 2) + exp(hmm.end_prob(:)) - 1) < 1e-3)
out = false;
if verb;
fprintf('is_valid_hmm: transmat is not normalized properly\n');
end
end
end
end
if strcmp(hmm.emission_type, 'GMM')
if ~isfield(hmm, 'gmms')
out = false;
if verb; fprintf('is_valid_hmm: missing gmms field\n'); end
else
for s = 1:length(hmm.gmms)
tmp = is_valid_gmm(hmm.gmms(s));
if ~tmp
out = false;
if verb
fprintf('is_valid_hmm: Error in state %d:\n ', s);
is_valid_gmm(hmm.gmms(s), verb);
end
break
end
end
end
end
if strcmp(hmm.emission_type, 'gaussian')
if ~isfield(hmm, 'means')
out = false;
if verb; fprintf('is_valid_hmm: missing means field\n'); end
else
if size(hmm.means, 2) ~= hmm.nstates
out = false;
if verb; fprintf('is_valid_hmm: means field is wrong length\n'); end
end
end
if ~isfield(hmm, 'covars')
out = false;
if verb; fprintf('is_valid_hmm: missing covars field\n'); end
else
if size(hmm.covars, 2) ~= hmm.nstates
out = false;
if verb; fprintf('is_valid_hmm: covars field is wrong length\n'); end
end
if isfield(hmm, 'means') && size(hmm.means, 1) ~= size(hmm.covars,1)
out = false;
if verb
fprintf(['is_valid_hmm: means and covars have inconsistent ' ...
'dimensions\n']);
end
end
if ~all(all(hmm.covars > 0))
out = false;
if verb; fprintf('is_valid_hmm: 0 or negative covars\n'); end
end
end
end