<p>In <a href="https://github.com/mlpack/mlpack/pull/523#discussion_r60355036">src/mlpack/core/util/split_data.hpp</a>:</p>
<pre style='color:#555'>&gt; + *TrainTestSplit(input, label, trainData,
&gt; + *               testData, trainLabel, testLabel);
&gt; + *@endcode
&gt; + */
&gt; +template&lt;typename T, typename U&gt;
&gt; +void TrainTestSplit(arma::Mat&lt;T&gt; const &amp;input,
&gt; +                    arma::Row&lt;U&gt; const &amp;inputLabel,
&gt; +                    arma::Mat&lt;T&gt; &amp;trainData,
&gt; +                    arma::Mat&lt;T&gt; &amp;testData,
&gt; +                    arma::Row&lt;U&gt; &amp;trainLabel,
&gt; +                    arma::Row&lt;U&gt; &amp;testLabel,
&gt; +                    double const testRatio)
&gt; +{
&gt; +  size_t const testSize =
&gt; +      static_cast&lt;size_t&gt;(input.n_cols * testRatio);
&gt; +  size_t const trainSize = input.n_cols - testSize;
</pre>
<p>Ok, than I would make it as prefix.</p>

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