<p>In <a href="https://github.com/mlpack/mlpack/pull/760#discussion_r74682180">src/mlpack/core/tree/hrectbound_impl.hpp</a>:</p>
<pre style='color:#555'>> }
>
> // Now take the Power'th root (but make sure our result is squared if it needs
> // to be); then cancel out the constant of 2 (which may have been squared now)
> // that was introduced earlier. The compiler should optimize out the if
> // statement entirely.
> - if (MetricType::TakeRoot)
> - return (ElemType) pow((double) sum, 1.0 / (double) MetricType::Power) / 2.0;
> + if (MetricType::Power == 1)
> + return sum * 0.5;
> + else if (MetricType::Power == 2)
> + {
> + if (MetricType::TakeRoot)
> + return std::sqrt(sum) * 0.5;
</pre>
<p>I've forgotten to ask about this piece of code:<br>
<code>pow((double) sum, 1.0 / (double) MetricType::Power)</code></p>
<p>Do you use the conversion in order to increase precision or you just take care of integral data types?</p>
<p>Should I replace <code>std::sqrt(sum)</code> by <code>(ElemType) std::sqrt((double) sum)</code>?</p>
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