Solved lab - #555
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Grid Search over n_estimators/max_depth/min_samples_split/max_features on the Random Forest (best model from the Ensemble lab, 79.3% baseline test accuracy). Best CV accuracy 80.7%, but tuned test accuracy (78.8%) came in slightly below the untouched baseline (79.3%) -- reported honestly with the CV-vs-single-test-split explanation for why that's not a failure.