They technically use the term constitutive model development. The math is similar to machine learning. Typically we know the basics of the physics, i.e. conser

They technically use the term constitutive model development. The math is similar to machine learning. Typically we know the basics of the physics, i.e. conservation of energy, momentum and angular momentum which set up the equations. But there a number of constitutive laws which relate parameters between these are "machine learned" but in generally, they are typically linear relations.