<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'>> +
> +namespace mlpack {
> +namespace tree {
> +
> +template<typename TreeType>
> +class NoAuxiliaryInformation
> +{
> + public:
> + NoAuxiliaryInformation() { };
> + NoAuxiliaryInformation(const TreeType* ) { };
> + NoAuxiliaryInformation(const TreeType& ) { };
> +
> + /**
> + * Some tree types require to save some properties at the insertion process.
> + * This method should return false if it does not handle the process.
> + */
</pre>
<p>I agree, I'll clarify that.</p>
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