title: Unknown face classification using FaceNet embedding
body: <p>I'm trying to use a classifier to recognise faces of family members.</p>
  
  <p>For now I'm using facenet embedding as input with a SVM classifier. With the limited number of faces that I have to distinguish, this gives really good results.</p>
  
  <p>However I'm not quite sure what to do in order to detect an unknown face as such.</p>
  
  <p>I tried training the classier on family faces as well as on a hundred more faces from the LFW database. If the prediction confidence is low enough, I say it's an unknown face.</p>
  
  <p>Is this the correct way to do this?</p>