We rationalize this preference for log-based features as reflecting the initial reaction rates ([AuCl4-] a [BH4-] b ...), as discussed in depth in the Supporting Information. The data-driven decision boundaries obtained from the decision tree are illustrated in Figure . Figure depicts a decision tree of depth 3 trained with the whole dataset while Supplementary Figure shows a 2-dimensional precursor space (with CTAB in seed solution and HCl in growth solution), obtained from the first two decision boundaries.