In this section, we will introduce how to convert the DFT labeled data into the data format used by DeePMD-kit.
The DeePMD-kit organize data in
system is composed by a number of
frames. One may roughly view a
frame as a snap short on an MD trajectory, but it does not necessary come from an MD simulation. A
frame records the coordinates and types of atoms, cell vectors if the periodic boundary condition is assumed, energy, atomic forces and virial. It is noted that the
frames in one
system share the same number of atoms with the same type.