Mercurial > hg > camir-aes2014
view toolboxes/FullBNT-1.0.7/bnt/CPDs/@hhmmQ_CPD/Old/update_ess3.m @ 0:e9a9cd732c1e tip
first hg version after svn
author | wolffd |
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date | Tue, 10 Feb 2015 15:05:51 +0000 |
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function CPD = update_ess(CPD, fmarginal, evidence, ns, cnodes, hidden_bitv) % UPDATE_ESS Update the Expected Sufficient Statistics of a hhmm Q node. % function CPD = update_ess(CPD, fmarginal, evidence, ns, cnodes, idden_bitv) % % we assume if one of the Qps is observed, all of them are % We assume the F nodes are already hidden % Figure out the node numbers associated with each parent dom = fmarginal.domain; self = dom(CPD.self_ndx); old_self = dom(CPD.old_self_ndx); %Fself = dom(CPD.Fself_ndx); %Fbelow = dom(CPD.Fbelow_ndx); Qps = dom(CPD.Qps_ndx); Qsz = CPD.Qsz; Qpsz = CPD.Qpsz; % hor_counts(old_self, Qps, self), % fmarginal(old_self, Fbelow, Fself, Qps, self) % hor_counts(i,k,j) = fmarginal(i,2,1,k,j) % below has finished, self has not % ver_counts(i,k,j) = fmarginal(i,2,2,k,j) % below has finished, and so has self (reset) % Since any of i,j,k may be observed, we write % hor_counts(ndx{:}) = fmarginal(...) % where e.g., ndx = {1, ':', 2} if Qps is hidden but we observe old_self=1, self=2. % ndx{i,k,j} if hidden_bitv(old_self) ndx{1} = ':'; else ndx{1} = evidence{old_self}; end if hidden_bitv(Qps) ndx{2} = ':'; else ndx{2} = subv2ind(Qpsz, cat(1, evidence{Qps})); end if hidden_bitv(self) ndx{3} = ':'; else ndx{3} = evidence{self}; end fmarg = add_ev_to_dmarginal(fmarginal, evidence, ns); % marg(Qold(t-1), Fbelow(t-1), Fself(t-1), Qps(t), Qself(t)) hor_counts = zeros(Qsz, Qpsz, Qsz); ver_counts = zeros(Qpsz, Qsz); if ~isempty(CPD.Fbelow_ndx) if ~isempty(CPD.Fself_ndx) % general case fmarg.T = myreshape(fmarg.T, [Qsz 2 2 Qpsz Qsz]); marg_ndx = {ndx{1}, 2, 1, ndx{2}, ndx{3}}; hor_counts(ndx{:}) = fmarg.T(marg_ndx{:}); ver_counts(ndx{2:3}) = ... % sum over Fbelow and Qold=i sum(fmarg.T({ndx{1}, 1, 2, ndx{2}, ndx{3}}),1) + .. sum(fmarg.T({ndx{1}, 2, 2, ndx{2}, ndx{3}}),1); else % no F from self, hence no startprob fmarg.T = myreshape(fmarg.T, [Qsz 2 Qpsz Qsz]); hor_counts(ndx{:}) = fmarg.T({ndx{1}, 2, ndx{2}, ndx{3}}); end else % no F signal from below if ~isempty(CPD.Fself_ndx) % self F fmarg.T = myreshape(fmarg.T, [Qsz 2 Qpsz Qsz]); hor_counts(ndx{:}) = fmarg.T({ndx{1}, 1, ndx{2}, ndx{3}}); ver_counts(ndx{2:3}) = ... % sum over Qold=i sum(fmarg.T({ndx{1}, 2, ndx{2}, ndx{3}}),1); else % no F from self error('An hhmmQ node without any F parents is just a tabular_CPD') end end CPD.sub_CPD_trans = update_ess_simple(CPD.sub_CPD_trans, hor_counts); if ~isempty(CPD.sub_CPD_start) CPD.sub_CPD_start = update_ess_simple(CPD.sub_CPD_start, ver_counts); end