ep_kde_diagonal         EP inference for diagonal KDE bandwidth
ep_kde_full             EP inference for full KDE bandwidth (precision
                        matrix)
ep_kde_isotropic        EP inference for isotropic KDE bandwidth
ep_kde_online           Online EP update for isotropic KDE bandwidth
kde_predict             Evaluate kernel density estimate at test points
model_evidence          Extract the log model evidence for model
                        comparison
