Recall scores of the different models (features schemes) considered for our diagnostic tool. The description of the models is presented in Table 3. The error is the standard deviation of the k recall scores (here k = 10), calculated using the CV method. The error on the recall scores for the SF galaxies is too small to be depicted here. Blue points correspond to the SF, yellow to AGN, green to LINER, red to composite, and purple to passive galaxies.