faceclustering_pairs.cs

// compare each face with all other faces
var edges = new List<SamplePair>();
for (uint i = 0; i < descriptors.Count; ++i)
    for (var j = i; j < descriptors.Count; ++j)

        // record every pair of two similar faces
        // faces are similar if they are less than 0.6 apart in the 128D embedding space
        if (Dlib.Length(descriptors[i] - descriptors[j]) < 0.6)
            edges.Add(new SamplePair(i, j));

// the rest of the code goes here...