<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r73956104">src/mlpack/core/tree/spill_tree/spill_tree_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  }
&gt; +
&gt; +  std::vector&lt;size_t&gt; leftPoints, rightPoints;
&gt; +  // Split the node.
&gt; +  overlappingNode = SplitPoints(tau, rho, points, leftPoints, rightPoints);
&gt; +
&gt; +  // We don&#39;t need the information in points, so lets clean it.
&gt; +  std::vector&lt;size_t&gt;().swap(points);
&gt; +
&gt; +  // Now we will recursively split the children by calling their constructors
&gt; +  // (which perform this splitting process).
&gt; +  left = new SpillTree(this, leftPoints, tau, maxLeafSize, rho);
&gt; +  right = new SpillTree(this, rightPoints, tau, maxLeafSize, rho);
&gt; +
&gt; +  // Update count number, to represent the number of descendant points.
&gt; +  count = left-&gt;NumDescendants() + right-&gt;NumDescendants();
</pre>
<p>Yeah, I understand! Ok, so we want <code>Descendant(i)</code> to represent a unique points from the dataset. I will think about this!</p>

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