<p>In <a href="https://github.com/mlpack/mlpack/pull/746#discussion_r75756004">src/mlpack/core/tree/cellbound_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +        // The compiler should optimize out this if statement entirely.
&gt; +        if (MetricType::Power == 1)
&gt; +        {
&gt; +          loSum += vLo; // vLo is non-negative.
&gt; +          hiSum += vHi; // vHi is non-negative.
&gt; +        }
&gt; +        else if (MetricType::Power == 2)
&gt; +        {
&gt; +          loSum += vLo * vLo;
&gt; +          hiSum += vHi * vHi;
&gt; +        }
&gt; +        else
&gt; +        {
&gt; +          loSum += std::pow(vLo, (ElemType) MetricType::Power);
&gt; +          hiSum += std::pow(vHi, (ElemType) MetricType::Power);
&gt; +        }
</pre>
<p>You could probably do early termination here too but the condition would be a but stricter.</p>

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