It is rather hard to analyse the results bundling all submissions together. In Fig. an overview of the performance for all submissions is provided, taking the RMSD in the test set as a measure. This choice is not without bias, given that not all submissions included all 10 test systems. Nonetheless, it does allow for some first general considerations in regard to the different types of calculations. The best fully anharmonic submission (FA3) still exhibits a RMSD of 38.5 cm -1 , a rather large value considering that the shifts only go up to 203 cm -1 . It is in general the class with the lowest performance. Only 6 submissions are below the 30 cm -1 mark (PH5, AC2, AC4, LS1, LS3 and LS4) and 4 below 15 cm -1 (PH5, AC2, LS3 and LS4). Somewhat surprisingly, this shows that a similar accuracy can be reached with wildly varying approaches to the problem. Learning strategies do show some advantage, but the differences are not so significant that one would immediately exclude other approaches to the problem.