<p>I don't think you should rename the existing <code>TrainTestSplit()</code> to <code>LabelTrainTestSplit()</code>, you should just leave it named <code>TrainTestSplit()</code> and add additional overloads for when labels are not present.  To be honest, I think it would also be fine if we renamed the function the simpler <code>Split()</code>, but I am not picky about that part.</p>

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