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**Nonlinear rescaling and proximal-like methods in convex optimization.**
*(English)*
Zbl 0882.90106

Summary: The nonlinear rescaling principle (NRP) consists of transforming the objective function and/or the constraints of a given constrained optimization problem into another problem which is equivalent to the original one in the sense that their optimal set of solutions coincides. A nonlinear transformation parameterized by a positive scalar parameter and based on a smooth scaling function is used to transform the constraints. The methods based on NRP consist of sequential unconstrained minimization of the classical Lagrangian for the equivalent problem, followed by an explicit formula updating the Lagrange multipliers. We first show that the NRP leads naturally to proximal methods with an entropy-like kernel, which is defined by the conjugate of the scaling function, and establish that the two methods are dually equivalent for convex constrained minimization problems. We then study the convergence properties of the nonlinear rescaling algorithm and the corresponding entropy-like proximal methods for convex constrained optimization problems. Special cases of the nonlinear rescaling algorithm are presented. In particular a new class of exponential penalty-modified barrier functions methods is introduced.

### MSC:

90C25 | Convex programming |

### Keywords:

nonlinear rescaling principle; convergence properties; entropy-like proximal methods; convex constrained optimization; exponential penalty-modified barrier functions methods
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\textit{R. Polyak} and \textit{M. Teboulle}, Math. Program. 76, No. 2 (A), 265--284 (1997; Zbl 0882.90106)

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