Two databases from the regression task databases contained less than 1000 molecules. The experimental properties had standard deviation values from 1.04 to 2.18 except melting point which standard deviation was 94.09. The classification databases contained binary activity classes -either active or inactive. Among the databases, two were highly imbalanced -the minority-to-majority ratios were about 1:12 in the case of the ClinTox database and 1:6 in the case of BBBP database.