Sensitivity and Dimensionality of Atomic Environment Representations used for Machine Learning Interatomic Potentials
Berk Onat,
Christoph Ortner,
James R. Kermode
Abstract:Faithfully representing chemical environments is essential for describing materials and molecules with machine learning approaches. Here, we present a systematic classification of these representations and then investigate: (i) the sensitivity to perturbations and (ii) the effective dimensionality of a variety of atomic environment representations, and over a range of material datasets. Representations investigated include Atom Centred Symmetry Functions, Chebyshev Polynomial Symmetry Functions, Smooth Overlap… Show more
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