Fig. 7
From: A comparison of mixed-variables Bayesian optimization approaches
Representation of the correlation between the latent variables at various iterations t. The size and the color of the circles correspond to the absolute and signed magnitudes of the correlations. The correlations are those of the categorical kernel of Eq. (2.2). The levels were grouped according to \({\tilde{I}}\): \(\{1, 4, 7, 10\}\), \(\{2, 5, 8, 11\}\), \(\{3, 6, 9, 12\}\)