Reconstruction of the angular diameter distance using mock SNe Ia data. The green and blue dots indicate the angular diameter distance calculated from low-z and high-z SNe Ia, respectively. The solid orange line indicates the redshift-distance relation based on a flat ΛCDM cosmology with Ω_M = 0.3 and h = 0.7. The dashed red line represents the best-fit distance reconstruction obtained by ANN+SNIa. The shaded region shows the corresponding 1σ uncertainties.