use train/test split, use mlp.predit() for confusion matrix. #56
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We already use sklearn's train/test split function a few times prior to this episode, so I swapped the manual split with train_test_split().
Confusion matrix section: I used mlp.predict() to generate all predictions at once, rather than using a for-loop and appending one prediction at a time. I also skipped right to the ConfusionMatrixDisplay function rather than doing that as an exercise.