For molecules with multiple known experimental structures, Figure (a) and 4(b) show the rankings and relative energies of the predicted candidate structures best matching the corresponding known experimental structures after clustering. In all cases, the known experimental structures were sampled and ranked well. 80% of the candidate structures matching known experimental structures were ranked among the top 10 of the predictions with relative energies less than 1.0 kcal/mol as compared to the lowest energy predicted structures. Among this subset of molecules with multiple known experimental structures, the energy gap between the most stable known polymorph and the lowest energy predicted structure is only about 0.5 kcal/mol, which indicates that extensive experimental screening might have already identified the most stable polymorphs for these molecules.