<p>I added TrainTestSplit() and renamed old ones to LabelTrainTestSplit() as discussed in <a href="https://github.com/mlpack/mlpack/issues/651" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/651" data-id="156969188" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#651</a> .<br>
This is just a naive implementation mostly copied from Tham's work.<br>
I believe LabelTrainTestSplit can just reuse the code in TrainTestSplit twice for both data and labels.</p>

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