Our recently published coupled PESs of the O3 system in the dense manifolds of 3 A′ and 5 A′ states have demonstrated the power of PM-DDNN. Construction of useful analytic representations for such dense manifolds of states would have been almost impossible with traditional diabatization methods. This is especially notable because our coupled PESs are global, i.e., valid for any nuclear geometry, whereas many surface fittings in the literature are focused only on the potential along a single reaction coordinate or in a semiglobal domain.