3. The method of claim 1 , wherein providing the nonlinear constitutive relations comprises: identifying respective nonlinear constitutive relations of a current source and a charge source of the DUT as respective functions of the first dynamical variables and the calculated values of the second dynamical variables; and training artificial neural networks (ANNs) to learn the identified nonlinear constitutive relations of the current source and the charge source.
3. The method of claim 1 , wherein providing the nonlinear constitutive relations comprises: identifying respective nonlinear constitutive relations of a current source and a charge source of the DUT as respective functions of the first dynamical variables and the calculated values of the second dynamical variables; and training artificial neural networks (ANNs) to learn the identified nonlinear constitutive relations of the current source and the charge source. 6. The method of claim 3 , wherein the nonlinear constitutive relations comprise nonlinear computational models modeling relationships between each of the current source and the charge source and the responses of the nonlinear waveform data.