Model selection An often-adopted approach Cross-validation(Cv over a grid Advantage simple and almost universal Weakness high computation exponential in the number of hyperparameters and the number of grid points for each hyperparameterModel selection An often-adopted approach: Cross-validation (CV) over a grid Advantage: simple and almost universal! Weakness: high computation exponential in the number of hyperparameters and the number of grid points for each hyperparameter