<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'>> +#include <mlpack/core.hpp>
> +
> +
> +using namespace std;
> +
> +namespace mlpack {
> +namespace data {
> +
> +class CustomStrategy
> +{
> + // empty class
> +};
> +
> +} // namespace data
> +} // namespace mlpack
> +
</pre>
<p>What is this class for?Do nothing?In this case, maybe name it as DoNothingStrategy is better?</p>
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