<p>In <a href="https://github.com/mlpack/mlpack/pull/523#discussion_r60354949">src/mlpack/core/util/split_data.hpp</a>:</p>
<pre style='color:#555'>> + *arma::arma_rng::set_seed(100); //set the seed if you like
> + *TrainTestSplit(input, label, trainData,
> + * testData, trainLabel, testLabel);
> + *@endcode
> + */
> +template<typename T, typename U>
> +void TrainTestSplit(arma::Mat<T> const &input,
> + arma::Row<U> const &inputLabel,
> + arma::Mat<T> &trainData,
> + arma::Mat<T> &testData,
> + arma::Row<U> &trainLabel,
> + arma::Row<U> &testLabel,
> + double const testRatio)
> +{
> + size_t const testSize =
> + static_cast<size_t>(input.n_cols * testRatio);
</pre>
<p>Because the compiler may give you type cast warning if you do not add static_cast</p>
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