Comparison of the performance of the three networks described in Sect. 4. All samples include doubles and quads and a weighting factor of w_θE = 5, but different Einstein radius distribution or lower limits on the Einstein radius as indicated in the legend (upper left). Upper right panel: histogram of the brightness ratio of lensed source and lens. Bottom panel: for the full sample (left) and limited to θ_E > 0.8″ (right) the difference in Einstein radius as a function of the brightness ratio with the 1σ values. Shown are the Einstein radius difference in the range (white area in the histogram) where there are enough data points, and the blue and orange bars have been shifted slightly to the right for better visualization.