<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'>> + if (!CLI::HasParam("training_labels_file"))
> + {
> + trainingLabelsFile = "train_" + inputLabels;
> + Log::Warn << "You did not specify --training_labels_file. "
> + << "Training labels file name is automatically set to: "
> + << trainingLabelsFile << endl;
> + }
> + if (!CLI::HasParam("test_labels_file"))
> + {
> + testLabelsFile = "test_" + inputLabels;
> + Log::Warn << "You did not specify --test_labels_file. "
> + << "Test labels file name is automatically set to: "
> + << testLabelsFile << endl;
> + }
> + }
> + 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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