To minimize MSEtrain, we can simply solve for where its gradient is 0:
The equation 5.16, is not linear, but the search space is linear yet.
Loss function
Hyperparameter: parámetro que me permite controlar la optimización, y se ajusta con los valores de validación. La capacidad del modelo tambien pode ser un hiperparametro.
Cross-Validation
Folds: Números de intentos. (K-folds)
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