<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'>&gt; +  ElemType length = metric::EuclideanDistance::Evaluate(origin, direction);
&gt; +
&gt; +  if (length &gt; 0)
&gt; +    direction /= length;
&gt; +  else
&gt; +  {
&gt; +    // If the vector is equal to 0, choose an arbitrary dimension.
&gt; +    size_t k = math::RandInt(direction.n_rows);
&gt; +
&gt; +    direction[k] = 1.0;
&gt; +
&gt; +    length = metric::EuclideanDistance::Evaluate(origin, direction);
&gt; +
&gt; +    direction[k] /= length;
&gt; +  }
&gt; +}
</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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