<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r71805955">src/mlpack/core/data/dataset_mapper.hpp</a>:</p>
<pre style='color:#555'>&gt; +  const std::string&amp; UnmapString(const size_t value, const size_t dimension);
&gt; +
&gt; +
&gt; +  /**
&gt; +   * Return the value that corresponds to a given string in a given dimension.
&gt; +   * If the value is not a valid mapping in the given dimension, a
&gt; +   * std::invalid_argument is thrown.
&gt; +   *
&gt; +   * @param string Mapped string for value.
&gt; +   * @param dimension Dimension to unmap string from.
&gt; +   */
&gt; +  typename PolicyType::MappedType UnmapValue(const std::string&amp; string,
&gt; +                                            const size_t dimension);
&gt; +
&gt; +  template &lt;typename eT&gt;
&gt; +  void MapTokens(const std::vector&lt;std::string&gt;&amp; tokens,
</pre>
<p>Can you add some comments about this function?</p>

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