<p>In <a href="https://github.com/mlpack/mlpack/pull/650#discussion_r65277071">src/mlpack/methods/preprocess/preprocess_split_main.cpp</a>:</p>
<pre style='color:#555'>&gt; +    if (!CLI::HasParam(&quot;training_labels_file&quot;))
&gt; +    {
&gt; +      trainingLabelsFile = &quot;train_&quot; + inputLabels;
&gt; +      Log::Warn &lt;&lt; &quot;You did not specify --training_labels_file. &quot;
&gt; +        &lt;&lt; &quot;Training labels file name is automatically set to: &quot;
&gt; +        &lt;&lt; trainingLabelsFile &lt;&lt; endl;
&gt; +    }
&gt; +    if (!CLI::HasParam(&quot;test_labels_file&quot;))
&gt; +    {
&gt; +      testLabelsFile = &quot;test_&quot; + inputLabels;
&gt; +      Log::Warn &lt;&lt; &quot;You did not specify --test_labels_file. &quot;
&gt; +        &lt;&lt; &quot;Test labels file name is automatically set to: &quot;
&gt; +        &lt;&lt; testLabelsFile &lt;&lt; endl;
&gt; +    }
&gt; +  }
&gt; +  else
</pre>
<p>I think I get the intention, you like to preserve the data structure. In this case, I take it back.</p>

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