comparison toolboxes/FullBNT-1.0.7/bnt/CPDs/@hhmmQ_CPD/Old/update_ess3.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(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
+
+