Model validation via generative models. For each of the two planet populations, we show the clustering result of our Gaussian mixture model on population synthesis data (left), random noise (center), and data from a generative model (right). We note that the latter do not stem from a physical formation model but were generated from a high-order GMM that was trained on the original data. The clusters detected in these new data show largely the same structure as the original ones, whereas in the random noise no reliable clusters are found.