[mlpack-git] [mlpack/mlpack] add train test split (#523)

[Ryan Curtin]

> +             arma::Row<U> const &inputLabel,
> +             arma::Mat<T> &trainData,
> +             arma::Mat<T> &testData,
> +             arma::Row<U> &trainLabel,
> +             arma::Row<U> &testLabel)
> +  {
> +    size_t const testSize =
> +        static_cast<size_t>(input.n_cols * testRatio);
> +    size_t const trainSize = input.n_cols - testSize;
> +    trainData.set_size(input.n_rows, trainSize);
> +    testData.set_size(input.n_rows, testSize);
> +    trainLabel.set_size(trainSize);
> +    testLabel.set_size(testSize);
> +
> +    using Col = arma::Col<size_t>;
> +    arma::arma_rng::set_seed(seed);

I don't think there's any need for this, we should just assume that the user has called `math::RandomSeed()` appropriately.

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