<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r66933359">src/mlpack/core/data/impute_strategies/custom_strategy.hpp</a>:</p>
<pre style='color:#555'>&gt; +#include &lt;mlpack/core.hpp&gt;
&gt; +
&gt; +
&gt; +using namespace std;
&gt; +
&gt; +namespace mlpack {
&gt; +namespace data {
&gt; +
&gt; +class CustomStrategy
&gt; +{
&gt; +  // empty class
&gt; +};
&gt; +
&gt; +} // namespace data
&gt; +} // namespace mlpack
&gt; +
</pre>
<p>What is this class for?Do nothing?In this case, maybe name it as DoNothingStrategy is better?</p>

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