Mercurial > hg > camir-aes2014
comparison toolboxes/FullBNT-1.0.7/bnt/CPDs/@hhmmQ_CPD/Old/update_ess4.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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-1:000000000000 | 0:e9a9cd732c1e |
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1 function CPD = update_ess(CPD, fmarginal, evidence, ns, cnodes, hidden_bitv) | |
2 % UPDATE_ESS Update the Expected Sufficient Statistics of a hhmm Q node. | |
3 % function CPD = update_ess(CPD, fmarginal, evidence, ns, cnodes, idden_bitv) | |
4 % | |
5 % we assume if one of the Qps is observed, all of them are | |
6 % We assume the F nodes are already hidden | |
7 | |
8 % Figure out the node numbers associated with each parent | |
9 dom = fmarginal.domain; | |
10 self = dom(CPD.self_ndx); | |
11 old_self = dom(CPD.old_self_ndx); | |
12 %Fself = dom(CPD.Fself_ndx); | |
13 %Fbelow = dom(CPD.Fbelow_ndx); | |
14 Qps = dom(CPD.Qps_ndx); | |
15 | |
16 Qsz = CPD.Qsz; | |
17 Qpsz = CPD.Qpsz; | |
18 | |
19 | |
20 % hor_counts(old_self, Qps, self), | |
21 % fmarginal(old_self, Fbelow, Fself, Qps, self) | |
22 % hor_counts(i,k,j) = fmarginal(i,2,1,k,j) % below has finished, self has not | |
23 % ver_counts(i,k,j) = fmarginal(i,2,2,k,j) % below has finished, and so has self (reset) | |
24 % Since any of i,j,k may be observed, we write | |
25 % hor_counts(i_counts_ndx, kndx, jndx) = fmarginal(i_fmarg_ndx...) | |
26 % where i_fmarg_ndx = 1 and i_counts_ndx = i if old_self is observed to have value i, | |
27 % i_fmarg_ndx = 1:Qsz and i_counts_ndx = 1:Qsz if old_self is hidden, etc. | |
28 | |
29 | |
30 if hidden_bitv(old_self) | |
31 i_counts_ndx = 1:Qsz; | |
32 i_fmarg_ndx = 1:Qsz; | |
33 eff_oldQsz = Qsz; | |
34 else | |
35 i_counts_ndx = evidence{old_self}; | |
36 i_fmarg_ndx = 1; | |
37 eff_oldQsz = 1; | |
38 end | |
39 | |
40 if all(hidden_bitv(Qps)) % we assume all are hidden or all are observed | |
41 k_counts_ndx = 1:Qpsz; | |
42 k_fmarg_ndx = 1:Qpsz; | |
43 eff_Qpsz = Qpsz; | |
44 else | |
45 k_counts_ndx = subv2ind(Qpsz, cat(1, evidence{Qps})); | |
46 k_fmarg_ndx = 1; | |
47 eff_Qpsz = 1; | |
48 end | |
49 | |
50 if hidden_bitv(self) | |
51 j_counts_ndx = 1:Qsz; | |
52 j_fmarg_ndx = 1:Qsz; | |
53 eff_Qsz = Qsz; | |
54 else | |
55 j_counts_ndx = evidence{self}; | |
56 j_fmarg_ndx = 1; | |
57 eff_Qsz = 1; | |
58 end | |
59 | |
60 hor_counts = zeros(Qsz, Qpsz, Qsz); | |
61 ver_counts = zeros(Qpsz, Qsz); | |
62 | |
63 if ~isempty(CPD.Fbelow_ndx) | |
64 if ~isempty(CPD.Fself_ndx) % general case | |
65 fmarg.T = myreshape(fmarg.T, [eff_oldQsz 2 2 eff_Qpsz eff_Qsz]); | |
66 hor_counts(i_counts_ndx, k_counts_ndx, j_counts_ndx) = ... | |
67 fmarg.T(:, i_fmarg_ndx, 2, 1, k_fmarg_ndx, j_fmarg_ndx); | |
68 ver_counts(k_counts_ndx, j_counts_ndx) = ... % sum over Fbelow and Qold | |
69 sum(fmarg.T(:, 1, 2, k_fmarg_ndx, j_fmarg_ndx), 1) + ... | |
70 sum(fmarg.T(:, 2, 2, k_fmarg_ndx, j_fmarg_ndx), 1); | |
71 else % no F from self, hence no startprob | |
72 fmarg.T = myreshape(fmarg.T, [eff_oldQsz 2 eff_Qpsz eff_Qsz]); | |
73 hor_counts(i_counts_ndx, k_counts_ndx, j_counts_ndx) = ... | |
74 fmarg.T(i_fmarg_ndx, 2, k_fmarg_ndx, j_fmarg_ndx); | |
75 end | |
76 else % no F signal from below | |
77 if ~isempty(CPD.Fself_ndx) % self F | |
78 fmarg.T = myreshape(fmarg.T, [eff_oldQsz 2 eff_Qpsz eff_Qsz]); | |
79 hor_counts(i_counts_ndx, k_counts_ndx, j_counts_ndx) = ... | |
80 fmarg.T(i_fmarg_ndx, 1, k_fmarg_ndx, j_fmarg_ndx); | |
81 ver_counts(k_counts_ndx, j_counts_ndx) = ... % sum over Qold | |
82 sum(fmarg.T(:, 2, k_fmarg_ndx, j_fmarg_ndx), 1); | |
83 else % no F from self | |
84 error('An hhmmQ node without any F parents is just a tabular_CPD') | |
85 end | |
86 end | |
87 | |
88 | |
89 CPD.sub_CPD_trans = update_ess_simple(CPD.sub_CPD_trans, hor_counts); | |
90 | |
91 if ~isempty(CPD.sub_CPD_start) | |
92 CPD.sub_CPD_start = update_ess_simple(CPD.sub_CPD_start, ver_counts); | |
93 end | |
94 | |
95 |