<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'>&gt; +}
&gt; +
&gt; +//! Return the minimum distance from the center to any bound edge.
&gt; +template&lt;typename MetricType,
&gt; +         typename StatisticType,
&gt; +         typename MatType,
&gt; +         template&lt;typename BoundMetricType, typename...&gt; class BoundType,
&gt; +         template&lt;typename SplitBoundType, typename SplitMatType&gt;
&gt; +             class SplitType&gt;
&gt; +inline
&gt; +typename VantagePointTree&lt;MetricType, StatisticType, MatType, BoundType,
&gt; +    SplitType&gt;::ElemType
&gt; +VantagePointTree&lt;MetricType, StatisticType, MatType, BoundType,
&gt; +    SplitType&gt;::MinimumBoundDistance() const
&gt; +{
&gt; +  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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