Classification performances achieved by the different hyper-parameter combinations. The top panels are for the Euclid data sets, while the bottom panels are for the HST F606W filter. The left-hand plots show the performance of the all tested configurations in terms of the F₁-score and of the success rate S, for the validation (va) and test (tt) sets. The dashed lines show the performance of the best configuration in both cases, selected by the highest S_va score. The right-hand plots depict the median metrics values for configurations with a given number of PCA components. The shaded regions depict the 1σ envelope on the median. The red stars correspond to the optimal classifiers.