<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r66954820">src/mlpack/core/data/dataset_info.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -54,7 +59,8 @@ class DatasetInfo
&gt;     * @param string String to find/create mapping for.
&gt;     * @param dimension Index of the dimension of the string.
&gt;     */
&gt; -  size_t MapString(const std::string&amp; string, const size_t dimension);
&gt; +  typename MapPolicy::map_type_t MapString(const std::string&amp; string,
&gt; +                                            const size_t dimension);
</pre>
<p>updated</p>

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