Search Results for author: Alper Atamturk

Found 9 papers, 1 papers with code

Safe screening rules for L0-regression

no code implementations ICML 2020 Alper Atamturk, Andres Gomez

We give safe screening rules to eliminate variables from regression with L0 regularization or cardinality constraint.

regression

Parabolic Relaxation for Quadratically-constrained Quadratic Programming -- Part II: Theoretical & Computational Results

no code implementations7 Aug 2022 Ramtin Madani, Mersedeh Ashraphijuo, Mohsen Kheirandishfard, Alper Atamturk

In the first part of this work [32], we introduce a convex parabolic relaxation for quadratically-constrained quadratic programs, along with a sequential penalized parabolic relaxation algorithm to recover near-optimal feasible solutions.

Parabolic Relaxation for Quadratically-constrained Quadratic Programming -- Part I: Definitions & Basic Properties

no code implementations7 Aug 2022 Ramtin Madani, Mersedeh Ashraphijuo, Mohsen Kheirandishfard, Alper Atamturk

For general quadratically-constrained quadratic programming (QCQP), we propose a parabolic relaxation described with convex quadratic constraints.

Safe Screening for Logistic Regression with $\ell_0$-$\ell_2$ Regularization

no code implementations1 Feb 2022 Anna Deza, Alper Atamturk

In logistic regression, it is often desirable to utilize regularization to promote sparse solutions, particularly for problems with a large number of features compared to available labels.

regression

Enhanced Modeling of Contingency Response in Security-constrained Optimal Power Flow

1 code implementation17 Feb 2021 Tuncay Altun, Ramtin Madani, Alper Atamturk, Ross Baldick, Ali Davoudi

This paper provides an enhanced modeling of the contingency response that collectively reflects high-fidelity physical and operational characteristics of power grids.

Supermodularity and valid inequalities for quadratic optimization with indicators

no code implementations29 Dec 2020 Alper Atamturk, Andres Gomez

We show that the convex hull of the epigraph of the quadratic can be obtaining from inequalities for the underlying supermodular set function by lifting them into nonlinear inequalities in the original space of variables.

valid

Submodular Function Minimization and Polarity

no code implementations31 Dec 2019 Alper Atamturk, Vishnu Narayanan

Using polarity, we give an outer polyhedral approximation for the epigraph of set functions.

Rank-one Convexification for Sparse Regression

no code implementations29 Jan 2019 Alper Atamturk, Andres Gomez

Sparse regression models are increasingly prevalent due to their ease of interpretability and superior out-of-sample performance.

regression

Sparse and Smooth Signal Estimation: Convexification of L0 Formulations

no code implementations6 Nov 2018 Alper Atamturk, Andres Gomez, Shaoning Han

Signal estimation problems with smoothness and sparsity priors can be naturally modeled as quadratic optimization with $\ell_0$-"norm" constraints.

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