Mercurial > hg > camir-aes2014
view toolboxes/FullBNT-1.0.7/bnt/CPDs/@softmax_CPD/convert_to_table.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 T = convert_to_table(CPD, domain, evidence) % CONVERT_TO_TABLE Convert a softmax CPD to a table, incorporating any evidence % T = convert_to_table(CPD, domain, evidence) self = domain(end); ps = domain(1:end-1); cnodes = domain(CPD.cpndx); cps = myintersect(ps, cnodes); dps = domain(CPD.dpndx); dps_as_cps = domain(CPD.dps_as_cps.ndx); all_dps = union(dps,dps_as_cps); odom = domain(~isemptycell(evidence(domain))); if ~isempty(cps), assert(myismember(cps, odom)); end % all cts parents must be observed ns = zeros(1, max(domain)); ns(domain) = CPD.sizes; ens = ns; % effective node sizes ens(odom) = 1; % dpsize >= glimsz because the glm parameters are tied across the dps_as_cps parents dpsize = prod(ens(all_dps)); % size of ALL self'discrete parents dpvals = cat(1, evidence{myintersect(all_dps, odom)}); cpvals = cat(1, evidence{cps}); if ~isempty(dps_as_cps), separator = CPD.dps_as_cps.separator; dp_as_cpmap = find_equiv_posns(dps_as_cps, all_dps); dops_map = find_equiv_posns(myintersect(all_dps, odom), all_dps); puredp_map = find_equiv_posns(dps, all_dps); subs = ind2subv(ens(all_dps), 1:prod(ens(all_dps))); if ~isempty(dops_map), subs(:,dops_map) = subs(:,dops_map)+repmat(dpvals(:)',[size(subs,1) 1])-1; end end [w,b] = extract_params(CPD); T = zeros(dpsize, ns(self)); for i=1:dpsize, active_glm = i; dp_as_cpvals=zeros(1,sum(ns(dps_as_cps))); if ~isempty(dps_as_cps), active_glm = max([1,subv2ind(ns(dps), subs(i,puredp_map))]); % Extract the params compatible with the observations (if any) on the 'pure' discrete parents (if any) where_one = separator + subs(i,dp_as_cpmap); % and get in the dp_as_cp parents... dp_as_cpvals(where_one)=1; end T(i,:) = normalise(exp([dp_as_cpvals(:); cpvals(:)]'*w(:,:,active_glm) + b(:,active_glm)')); end if myismember(self, odom) r = evidence{self}; T = T(:,r); end T = myreshape(T, ens(domain));