Since the number of elemental properties is much larger in Rep3 in comparison to Rep2, we do not bin the data to keep the dimensionality of the input computationally manageable. It is notable that all of the three representations have no constraint on a particular geometry, stoichiometry or the number of sites. parameters and the last row first column gives the information whether the structure is stable (1) or unstable (0). The size of the resulting representation for a general crystal with N sites will be (N+2, i+5) where N is the number of sites and i is the size of the elemental properties vector.