<p>In <a href="https://github.com/mlpack/mlpack/pull/699#discussion_r69030868">src/mlpack/core/tree/rectangle_tree/minimal_coverage_sweep_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  std::vector&lt;SortStruct&lt;ElemType&gt;&gt; sorted(node-&gt;NumChildren());
&gt; +
&gt; +  for (size_t i = 0; i &lt; node-&gt;NumChildren(); i++)
&gt; +  {
&gt; +    sorted[i].d = SplitPolicy::Bound(node-&gt;Child(i))[axis].Hi();
&gt; +    sorted[i].n = i;
&gt; +  }
&gt; +  // Sort high bounds of children.
&gt; +  std::sort(sorted.begin(), sorted.end(), StructComp&lt;ElemType&gt;);
&gt; +
&gt; +  size_t splitPointer = fillFactor * node-&gt;NumChildren();
&gt; +
&gt; +  axisCut = sorted[splitPointer - 1].d;
&gt; +
&gt; +  // Check if the partition is suitable.
&gt; +  if (!CheckNonLeafSweep(node, axis, axisCut))
</pre>
<p>Absolutely so, I'll add a comment in order to clarify that.</p>

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