Diagonalizing the DPEM yields the final adiabatic potential energy. Constraining the potential of the high-dimensional system to be a function of the low-dimensional subsystems in the dissociation limit means that DDNN and PR-DDNN predict zero vectors for DPEM layer for dissociation limit geometries, 𝐚 )∈LD ,-* = 𝟎 (24) where "𝑛 ∈ LD" denotes that geometry n corresponds to the dissociation limit.