We therefore recommend this current generation of models only be used on compounds containing the fifteen cations spanned by the training database. Nonetheless, Figure demonstrates how the continuous encoding strategy significantly improves property prediction across selected element types. This could be due to the continuous encoding's preservation of quantitative periodic trends (e.g., electronegativity, mean volume per atom, etc.). In order to expand the quantitative applicability of the model for materials discovery outside of the current cation set, we plan to include a larger chemistry space in the future. cesses can be expressed in terms of reduction enthalpies and 400 entropies. For workable and economic thermodynamic con-401 ditions, these considerations lead to a desirable value for the 402 oxygen vacancy defect formation energy in an interval of about 403 [2.3, 4.0] eV. Lower formation energies impair the abil-404 ity to produce hydrogen in the oxidation step, while higher en-405 ergies prevent significant changes of the O stoichiometry in the 406 reduction step. To predict the defect formation energies for 407 these "unseen" materials, we utilize the expectation across K-408 fold models,