title: How to use `Linked Model` feature of Core ML 3?
body: <p><a href="https://developer.apple.com/videos/play/wwdc2019/704/" rel="nofollow noreferrer">As WWDC suggested</a>, a <code>linked model</code> feature is supported in Core ML 3., which allows developers re-use the same <code>mlmodelc</code> to save space.</p>
  
  <p>There are also two parameters named <a href="https://developer.apple.com/documentation/coreml/mlparameterkey/3227893-linkedmodelfilename" rel="nofollow noreferrer"><code>linkedModelFileName</code></a> and <a href="https://developer.apple.com/documentation/coreml/mlparameterkey/3227894-linkedmodelsearchpath" rel="nofollow noreferrer"><code>linkedModelSearchPath</code></a> in the documentation.</p>
  
  <p>But I didn't see any tutorials or examples about how to use it, except the proto of <code>Linked Model</code> is defined in <a href="https://apple.github.io/coremltools/coremlspecification/sections/LinkedModel.html" rel="nofollow noreferrer">the documentation of <code>coremltools</code></a>.</p>
  
  <p>So I'm just wondering if there is anybody knowing the exact way to use it?</p>