title: How is facial recognition built into Core ML vision framework
body: <p>How exactly is the facial recognition done in this framework done? The docs state that it is part of the framework </p>
  
  <blockquote>
    <p>Face Detection and Recognition</p>
  </blockquote>
  
  <p>However, it is not clear which classes/methods allow us to do so. The closest thing I've found is <code>VNFaceObservation</code> which is lacking significant details.</p>
  
  <p>Is it more of a manual process and we must include our own learned models someway? -- if so, how?</p>