<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69920655">src/mlpack/core/data/imputer.hpp</a>:</p>
<pre style='color:#555'>> +
> + //! Get the mapper
> + const MapperType& Mapper() const { return mapper; }
> +
> + //! Modify the given mapper (be careful!)
> + MapperType& Mapper() { return mapper; }
> +
> + private:
> + // StrategyType
> + StrategyType strategy;
> +
> + // DatasetMapperType<MapPolicy>
> + MapperType mapper;
> +
> + // save transpose as a member variable since it is rarely changed.
> + bool transpose;
</pre>
<p>It used like this</p>
<p>"3.0 0.0 2.0 0.0;"<br>
"5.0 6.0 0.0 6.0;"<br>
"9.0 8.0 4.0 8.0;"</p>
<pre><code>imputer.Impute(input, outputT, 0/*mappedValue*/,
99/*customValue*/, 0/*dimension*/, true);
</code></pre>
<p>"3.0 99 2.0 99;"<br>
"5.0 6.0 0.0 6.0;"<br>
"9.0 8.0 4.0 8.0;"</p>
<pre><code>imputer.Impute(input, outputT, 0/*mappedValue*/,
99/*customValue*/, 1/*dimension*/, false);
</code></pre>
<p>"3.0 99 2.0 0.0;"<br>
"5.0 6.0 0.0 6.0;"<br>
"9.0 8.0 4.0 8.0;"</p>
<p>I guess the problem is the name , I should suggest keon name it as "rowOrColBase", or design an enum class for it.My fault</p>
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