2D projection of t-SNE output for the 7031 spectra of the training sample, colored by the labels T_eff, log(g), [Fe/H] and A(Li) respectively. The right-most plot shows the t-SNE as the train and test sets to highlight their similar distribution across the label range. In the left subplot, we show the mean [Fe/H] and A(Li) for the highlighted island that consists of Spite plateau-like stars in the globular cluster NGC 6752.