CV                      Predictive Models with Cross Validation
FittedCV                Fitted, Cross-Validated Predictive Models
FittedGridSearch        Fitted Models across a Tuning Grid of
                        Hyper-parameters
FittedGridSearchCV      Fitted Models with Cross Validation across a
                        Tuning Grid of Hyper-parameters
GridSearch              Tune Predictive Model Hyper-parameters with
                        Grid Search
GridSearchCV            Tune Predictive Model Hyper-parameters with
                        Grid Search and Cross-Validation
cv_split                Generate cross-validation fold indices
