<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r70197784">src/mlpack/core/data/map_policies/missing_policy.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -63,9 +63,11 @@ class MissingPolicy
&gt;    template &lt;typename MapType&gt;
&gt;    MappedType MapString(const std::string&amp; string,
&gt;                         const size_t dimension,
&gt; -                       MapType maps,
&gt; +                       MapType&amp; maps,
</pre>
<p>debugged MissingPolicy</p>

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