<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r68372328">src/mlpack/core/data/imputer.hpp</a>:</p>
<pre style='color:#555'>&gt;    }
&gt;  
&gt;    /**
&gt;    * This overload of Impute() lets users to define custom value that
&gt;    * can be replaced with the target value.
&gt;    */
&gt; -  template &lt;typename T&gt;
&gt; -  void Impute(const arma::Mat&lt;T&gt; &amp;input,
&gt; -              arma::Mat&lt;T&gt; &amp;output,
&gt; -              const std::string &amp;targetValue,
&gt; -              const T &amp;customValue,
&gt; +  void Impute(const arma::Mat&lt;T&gt;&amp; input,
</pre>
<p>Maybe we could std::enable_if to specify which type of imputation are support by this function?Or static_assert?If it works, I think static_assert is a better choice, since the error messages should be more human friendly.</p>

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