Sampling configuration and chemical space is essential to build high quality ML potentials. The general goals of structural sampling includes but not limited to (1) keeping minimum but optimal amount of structures for data generation to reduce high cost QM calculations, (2) comprehensively cover most important and representative global/local chemical environments and (3) limit sampling on non-related or on-the-fly surfaces. For reactive potentials, achieving these goals are not trivial since it is difficult to collect enough structures on rare events and rebuild a complicated reactive PES with one or more saddle points. A straightforward way to sample reactive structures is to locate QM level TS and minimum energy pathways through Intrinsic Reaction Coordinate (IRC)