In this talk, Álvaro introduces us to FABOLAS, a Bayesian optimization procedure for hyperparameter tuning “which models loss and training time as a function of dataset size and automatically trades off high information gain about the global optimum against computational cost.” This is done with “a generative model for the validation error as a function of training set size, which is learned during the optimization process and allows exploration of preliminary configurations on small subsets, by extrapolating to the full dataset.”