<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r66967548">src/mlpack/core/data/imputer.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +/**
&gt; + * This class implements a way to replace target values. It is dependent on the
&gt; + * user defined Strategy and Mapper used to hold dataset&#39;s information.
&gt; + *
&gt; + * @tparam Option of imputation strategy.
&gt; + * @tparam Mapper that is used to hold dataset information.
&gt; + * @tparam primitive type of input and output&#39;s armadillo matrix.
&gt; + */
&gt; +template&lt;typename MatType, typename Mapper, typename Strategy&gt;
&gt; +class Imputer
&gt; +{
&gt; + private:
&gt; +  Strategy strat;
&gt; + public:
&gt; +  Imputer()
</pre>
<p>Updated!</p>

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