GPa. The NNP was then validated by its predicted lattice constant and elastic constants of graphite and diamond with a PBE Kernel models also show great performance on phase change simulations. Starting from 2010, the Csányi group has been exploring the performance of GAP models on predicting properties of carbon allotropes. Recently, Rowe et al. reported GAP-20, the newest version of a GAP model that was trained to reproduce the formation process of low energy allotropes from liquid carbon and even defects of graphene surface during MD simulations. Also, Mortazavi et al. expanded the usage of the MTP model to a graphene-like 2D systems such as h-BN, haeckelite and phagraphene.