<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67908153">src/mlpack/core/tree/rectangle_tree/no_auxiliary_information.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +namespace mlpack {
&gt; +namespace tree {
&gt; +
&gt; +template&lt;typename TreeType&gt;
&gt; +class NoAuxiliaryInformation
&gt; +{
&gt; + public:
&gt; +  NoAuxiliaryInformation() { };
&gt; +  NoAuxiliaryInformation(const TreeType* ) { };
&gt; +  NoAuxiliaryInformation(const TreeType&amp; ) { };
&gt; +
&gt; +  /**
&gt; +   * Some tree types require to save some properties at the insertion process.
&gt; +   * This method should return false if it does not handle the process.
&gt; +   */
</pre>
<p>I agree, I'll clarify that.</p>

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