From the ∼3700 queried oxides, we a priori prioritized structures and paths for NEB calculations to ensure diversity of chemistry, structure, and path lengths, as shown in Figure (see Supplementary Section 1 for more details on DFT-based NEB calculations and training data structure and path selection). We obtained 622 converged NEB calculations spanning 272 structures, each of which represents a unique chemical system. Figure summarizes the chemical diversity of the training data, with colorcoding used to represent the number of compounds in which each element appears. Figure counts the number of compounds for each crystal system, grouping them into bins corresponding to binary (b), ternary (t), and quaternary (q) chemical systems.