Figure 5.

The relative score from the outer splits per task. Relative score means ${\mathrm{MAE}}_{\mathit{rel}}$ for Matbench-steels, ${\mathrm{MAPE}}_{\mathit{rel}}$ for Xiong and ${\mathrm{R}}_{\mathit{rel}}^2$ otherwise. For Hu and Koya the literature provides a performance range, represented by a black “error bar”.