TrainValidationSplit (Estimator)
<tvs> 
 (Parameters -- Tuning)
  estimator: LogisticRegression
             <logistic> 
  evaluator: BinaryClassificationEvaluator
             <bineval> 
    with metric areaUnderROC 
  train_ratio: 0.75 
  [Tuned over 4 hyperparameter sets]
