Performance of the adversarial model trained with the COSMOS UDF sample alone (v2, orange lines) or with the COSMOS UDF sample supplemented by the DEEP2 spectroscopic sample in cross-validation mode (v3, turquoise lines) for the DEEP2 spectroscopic sample as a function of redshift and magnitude. The dark blue and pink lines are the baseline results (v0 and v1) shown in Fig. 8. The ugrizy SED-fitting metrics are shown in green.