<p>In <a href="https://github.com/mlpack/mlpack/pull/726#discussion_r73705052">src/mlpack/core/tree/binary_space_tree/rp_tree_mean_split_impl.hpp</a>:</p>
<pre style='color:#555'>> + ElemType length = metric::EuclideanDistance::Evaluate(origin, direction);
> +
> + if (length > 0)
> + direction /= length;
> + else
> + {
> + // If the vector is equal to 0, choose an arbitrary dimension.
> + size_t k = math::RandInt(direction.n_rows);
> +
> + direction[k] = 1.0;
> +
> + length = metric::EuclideanDistance::Evaluate(origin, direction);
> +
> + direction[k] /= length;
> + }
> +}
</pre>
<p>Yes, I agree, we can move that function to the core, but in that case we can not use <code>arma::norm</code>.</p>
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