<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r68483970">src/mlpack/methods/preprocess/preprocess_imputer_main.cpp</a>:</p>
<pre style='color:#555'>&gt;  
&gt; -    Imputer&lt;arma::Mat&lt;double&gt;, Mapper, MeanStrategy&gt; impu(info);
&gt; +    Imputer&lt;double, MapperType, MeanImputation&lt;double&gt;&gt; impu(info);
</pre>
<p>yea, the ones that are implemented are basic stuffs.<br>
we can definitely add more, but I am not very sophisticated in statistics, so i need to study before implementing the more advanced ones.</p>

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