NetZ_main (black points) performance in terms of bias (top-left panel), dispersion (bottom-left panel), and outlier rate (bottom-right panel) as functions of the reference redshift z_ref in comparison to DEmP (red bars). Definitions of bias, dispersion and outlier rate are given in Eqs. (2)–(4). We show also with blue bars the results from a network where we do not use data augmentation to increase the number of high-z galaxies. The values in dashed bars are based on limited number of galaxies. The histogram in the top-right panel shows the number of galaxies as a function of redshift in the test set T used for the comparison. NetZ performs substantially better than DEmP at z_ref ≳ 2, with smaller bias, lower dispersion and lower outlier rate, by up to a factor of 2.