Similar to the S2EF task authors propose two metrics for IS2RE. The first measures the MAE on the computed and ground truth energy. The second measures the energies within a threshold (EwT) of the ground truth, which once again measures the percentage of estimated energies that are likely to be practically useful. Energy MAE is the mean Absolute Error between the computed relaxed energy and the ground truth relaxed energy. EwT is the percentage of computed relaxed energies within = 0.02 eV of the ground truth relaxed energy.