2. The method of claim 1 , wherein the trained reference model includes an input term and is operable to generate an output term as a function of the input term, and the method further comprises: measuring at least one value of the output term; inverting the trained reference model to determine a value of the input term that generates the value of the output term; and comparing the determined value of an input term to a commanded value of the input term associated with the system.
2. The method of claim 1 , wherein the trained reference model includes an input term and is operable to generate an output term as a function of the input term, and the method further comprises: measuring at least one value of the output term; inverting the trained reference model to determine a value of the input term that generates the value of the output term; and comparing the determined value of an input term to a commanded value of the input term associated with the system. 4. The method of claim 2 , further comprising controlling the system based on the comparison.