<p>In <a href="https://github.com/mlpack/mlpack/pull/746#discussion_r76306894">src/mlpack/core/tree/cellbound.hpp</a>:</p>
<pre style='color:#555'>> +
> + /**
> + * Serialize the bound object.
> + */
> + template<typename Archive>
> + void Serialize(Archive& ar, const unsigned int version);
> +
> + private:
> + //! The precision of the tree element type.
> + static constexpr size_t order = sizeof(AddressElemType) * CHAR_BIT;
> + //! Maximum number of subrectangles.
> + const size_t maxNumBounds = 10;
> + //! The dimensionality of the bound.
> + size_t dim;
> + //! The bounds for each dimension.
> + math::RangeType<ElemType>* bounds;
</pre>
<p>It seems like we can't remove this because of the <code>Center()</code> calculation and the <code>Diameter()</code>. Removing it would mean that for <code>Center()</code> we would have to calculate the mean of all subrectangle centers, and it would be harder to cache something for <code>Diameter()</code>. My idea in removing it was to make <code>sizeof(CellBound)</code> smaller but it seems that's not really feasible. But I thought it would be useful to write down the notes anyway in case it was ever revisited later. :)</p>
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