Learn about function notation, how to find an inverse function by changing the subject, and how to work with composite functions.

In this paper, we propose an extended Levenberg-Marquardt (ELM) framework that generalizes the classic Levenberg-Marquardt (LM) method to solve the unconstrained minimization problem min where ρ (r (x ...

We show that this problem is closely related to the problem of composite function estimation that has recently gotten much attention in statistical literature.