Functional Approximation statistical approximationStatistical Approximation MethodsMonte Carlo MethodReparameterization trickVariational InferenceMean-field theorySparse Approximation Approximation theory In mathematics, approximation theory is concerned with how functions can best be approximated with simpler functions, and with quantitatively characterizing the errors introduced thereby. What is meant by best and simpler will depend on the application.https://en.wikipedia.org/wiki/Approximation_theory
