diff toolboxes/RBM/lowest_fenergy.m @ 0:e9a9cd732c1e tip

first hg version after svn

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/RBM/lowest_fenergy.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,22 @@
+function L = lowest_fenergy(V,W,visB,hidB,Classes)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Return the labels L(Classes) to the lowest energy softmax unit      %   
+% visP: hidden states                                                %
+% visN: reconstructed data (with softmax)                            %
+% WW = [W visB hidB]                                                 %
+% F(v) = -\sum_i v_ia_i - \sum_jlog(1+e^(x_j))                       %
+% -*-sontran2012-*-                                                  %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+lNum = size(Classes,2);
+sNum = size(V,1);
+F = zeros(sNum,lNum);
+out = zeros(sNum,lNum);
+for i=1:lNum
+    F(:,i) = 1;
+    X = [V F]*W + repmat(hidB,sNum,1);
+    out(:,i) = sum(repmat(visB,sNum,1).*[V F],2) + sum(log(1+exp(X)),2);
+    F(:,i) = 0;
+end
+L =  softmax2discrete(out,Classes);
+end
+