<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'>> + const std::string& UnmapString(const size_t value, const size_t dimension);
> +
> +
> + /**
> + * Return the value that corresponds to a given string in a given dimension.
> + * If the value is not a valid mapping in the given dimension, a
> + * std::invalid_argument is thrown.
> + *
> + * @param string Mapped string for value.
> + * @param dimension Dimension to unmap string from.
> + */
> + typename PolicyType::MappedType UnmapValue(const std::string& string,
> + const size_t dimension);
> +
> + template <typename eT>
> + void MapTokens(const std::vector<std::string>& tokens,
</pre>
<p>Can you add some comments about this function?</p>
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