comparison toolboxes/FullBNT-1.0.7/bnt/CPDs/@hhmmQ_CPD/update_ess.m @ 0:e9a9cd732c1e tip

first hg version after svn

+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(end);
+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(i_counts_ndx, kndx, jndx) = fmarginal(i_fmarg_ndx...)
+% where i_fmarg_ndx = 1 and i_counts_ndx = i if old_self is observed to have value i,
+% i_fmarg_ndx = 1:Qsz and i_counts_ndx = 1:Qsz if old_self is hidden, etc.
+
+
+if hidden_bitv(old_self)
+  i_counts_ndx = 1:Qsz;
+  eff_oldQsz = Qsz;
+else
+  i_counts_ndx = evidence{old_self};
+  eff_oldQsz = 1;
+end
+
+if all(hidden_bitv(Qps)) % we assume all are hidden or all are observed
+  k_counts_ndx = 1:Qpsz;
+  eff_Qpsz = Qpsz;
+else
+  k_counts_ndx = subv2ind(Qpsz, cat(1, evidence{Qps}));
+  eff_Qpsz = 1;
+end
+
+if hidden_bitv(self)
+  j_counts_ndx = 1:Qsz;
+  eff_Qsz = Qsz;
+else
+  j_counts_ndx = evidence{self};
+  eff_Qsz = 1;
+end
+
+hor_counts = zeros(Qsz, Qpsz, Qsz);
+ver_counts = zeros(Qpsz, Qsz);
+    
+if ~isempty(CPD.Fbelow_ndx)
+  if ~isempty(CPD.Fself_ndx) % general case
+    fmarg = myreshape(fmarginal.T, [eff_oldQsz 2 2 eff_Qpsz eff_Qsz]);
+    hor_counts(i_counts_ndx, k_counts_ndx, j_counts_ndx) =  fmarg(:, 2, 1, :, :);
+    ver_counts(k_counts_ndx, j_counts_ndx) = ... % sum over Fbelow and Qold
+	sumv(fmarg(:, :,  2, :, :), [1 2]); % require Fself=2
+  else % no F from self, hence no startprob
+    fmarg = myreshape(fmarginal.T, [eff_oldQsz 2 eff_Qpsz eff_Qsz]);
+    hor_counts(i_counts_ndx, k_counts_ndx, j_counts_ndx) = ...
+	fmarg(:, 2, :, :); % require Fbelow = 2
+  end
+else % no F signal from below
+  if ~isempty(CPD.Fself_ndx) % self F
+    fmarg = myreshape(fmarginal.T, [eff_oldQsz 2 eff_Qpsz eff_Qsz]);
+    hor_counts(i_counts_ndx, k_counts_ndx, j_counts_ndx) =  fmarg(:, 1, :, :);
+    ver_counts(k_counts_ndx, j_counts_ndx) = ... % sum over Qold
+	squeeze(sum(fmarg(:, 2, :, :), 1)); % Fself=2
+  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
+
+