<p>In <a href="https://github.com/mlpack/mlpack/pull/708#discussion_r71807025">src/mlpack/core/tree/vantage_point_tree/vantage_point_tree_impl.hpp</a>:</p>
<pre style='color:#555'>> +}
> +
> +//! Return the minimum distance from the center to any bound edge.
> +template<typename MetricType,
> + typename StatisticType,
> + typename MatType,
> + template<typename BoundMetricType, typename...> class BoundType,
> + template<typename SplitBoundType, typename SplitMatType>
> + class SplitType>
> +inline
> +typename VantagePointTree<MetricType, StatisticType, MatType, BoundType,
> + SplitType>::ElemType
> +VantagePointTree<MetricType, StatisticType, MatType, BoundType,
> + SplitType>::MinimumBoundDistance() const
> +{
> + return bound.MinWidth() / 2.0;
</pre>
<p>In this case I think this will just be <code>bound.OuterRadius()</code>. (That's the same as this, I think, just without a division.)</p>
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