Table 2 The R² and mean absolute error (MAE) values for the prediction of the PBE bandgap (E_PBE), the HSE bandgap with (\({E}_{HSE}^{PBE}\)) and without (E_HSE) using the PBE bandgap as a feature, the GW bandgap with (\({E}_{GW}^{PBE}\)) and without (E_GW) using the PBE bandgap as a feature, and the exciton binding energy E_b.

From: Naturally-meaningful and efficient descriptors: machine learning of material properties based on robust one-shot ab initio descriptors