<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69965705">src/mlpack/core/data/imputer.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +  //! Get the mapper
&gt; +  const MapperType&amp; Mapper() const { return mapper; }
&gt; +
&gt; +  //! Modify the given mapper (be careful!)
&gt; +  MapperType&amp; Mapper() { return mapper; }
&gt; +
&gt; + private:
&gt; +  // StrategyType
&gt; +  StrategyType strategy;
&gt; +
&gt; +  // DatasetMapperType&lt;MapPolicy&gt;
&gt; +  MapperType mapper;
&gt; +
&gt; +  // save transpose as a member variable since it is rarely changed.
&gt; +  bool transpose;
</pre>
<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> The default is rowMajor (which considers the data is transposed) right now.<br>
Which one do you prefer? <code>rowMajor</code> or <code>columnMajor</code>?</p>

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