featurize a material.

Enter a chemical formula. MaterialsFeaturizer parses the composition (subscripts, fractional stoichiometry, nested parentheses) and computes real Magpie-style elemental-property descriptors — composition-weighted mean, range, and average deviation of atomic weight, Pauling electronegativity, atomic radius, melting point, period/group, and valence-electron count — from a built-in periodic table, plus a flat, ready-to-model feature vector. The standard first step of any materials-property ML model, no GPU required.