Photochemical reactions represent processes that are initiated by the absorption of light, promoting chemical systems from a ground electronic state to an excited state. Dynamical studies of photochemical reactions are very time-consuming since they require a description of non-adiabatic processes with expensive multiconfigurational QM methods. Recent development of RMLP for non-adiabatic MD (NAMD) sheds new light on studying photochemical reactions . The Habershon group applied a GPR model to simulate and explain an excited state hydrogen tunneling effect . Marquetand and coworkers developed the SchNarc framework to combine a SchNet MLP model and the SHARC MD package for NAMD photodynamics simulations . An interesting roaming mechanism was observed which can lead to further photodamage of tyrosine substrates with the SchNarc NAMD technique . Please refer to ref for more discussions on photochemical NAMD with MLPs.