Visualization of training datasets with parameters close to our best-fitting BANN inferences. The top row displays example total intensity ray-traced ground-truth model images on logarithmic scales with varying dynamic ranges. Top left corners show the type of model, top right corners show the model parameters: spin a_* = s, R_high = r, and i_los = l parameters are listed in a shorthand notation as a_s, R_r, and i_l. The Sgr A^* models are displayed here with θ_PA = 0. The standard models are based on the Kerr metric (see Section 3 text). Distributions of normalized visibility amplitudes and phases with standard deviation error bands computed from all synthetic data training samples of each model are plotted in the middle and bottom rows, respectively. These visibilities are depicted for all Stokes parameters. For the unpolarized dilaton models, the polarized data probes only instrumental effects and are faded out.