<p>In <a href="https://github.com/mlpack/mlpack/pull/669#discussion_r65612287">src/mlpack/methods/preprocess/preprocess_split_main.cpp</a>:</p>
<pre style='color:#555'>&gt; @@ -67,23 +67,21 @@ int main(int argc, char** argv)
&gt;    CLI::ParseCommandLine(argc, argv);
&gt;    const string inputFile = CLI::GetParam&lt;string&gt;(&quot;input_file&quot;);
&gt;    const string inputLabels = CLI::GetParam&lt;string&gt;(&quot;input_labels_file&quot;);
&gt; -  string trainingFile = CLI::GetParam&lt;string&gt;(&quot;training_file&quot;);
&gt; -  string testFile = CLI::GetParam&lt;string&gt;(&quot;test_file&quot;);
&gt; -  string trainingLabelsFile = CLI::GetParam&lt;string&gt;(&quot;training_labels_file&quot;);
&gt; -  string testLabelsFile = CLI::GetParam&lt;string&gt;(&quot;test_labels_file&quot;);
&gt; +  const string trainingFile = CLI::GetParam&lt;string&gt;(&quot;training_file&quot;);
&gt; +  const string testFile = CLI::GetParam&lt;string&gt;(&quot;test_file&quot;);
&gt; +  const string trainingLabelsFile = CLI::GetParam&lt;string&gt;(&quot;training_labels_file&quot;);
&gt; +  const string testLabelsFile = CLI::GetParam&lt;string&gt;(&quot;test_labels_file&quot;);
&gt;    const double testRatio = CLI::GetParam&lt;double&gt;(&quot;test_ratio&quot;);
&gt;  
&gt;    // Check on data parameters.
&gt;    if (trainingFile.empty())
</pre>
<p>Shouldn't this now be <code>if (!CLI::HasParam("training_file"))</code> since there's now a default value? (same for the other parameters)</p>

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