open source pkg v1

pkg/OpenFace/model_training/CCNF/CCRF/lib/similarityGauss.m

@@ -0,0 +1,25 @@
+function SimilarityMatrix = similarityGauss(x, sigma, range, mask)
+%spatial distance measure, based on exponential decay, creates a matrix of
+%similarities
+
+% get the euclidean distance for each pair
+if(numel(range) > 0)
+Distances = exp(-pdist(x(:,range))/sigma); % 0.05 best so far
+else
+Distances = exp(-pdist(x)/sigma); % 0.05 best so far    
+end
+SimilarityMatrix = squareform(Distances);
+
+% invalidate the illegal values from the mask (if at least one element is
+% not present in the mask set similarity to 0)
+if(numel(mask) ~= 0)    
+    invalidInds = sum(mask(:,range),2) < numel(range);
+
+    SimilarityMatrix(invalidInds,:) = 0;
+    SimilarityMatrix(:,invalidInds) = 0;
+end
+
+SimilarityMatrix = SimilarityMatrix + eye(size(x, 1));
+
+end
+