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- Sören Laue
- ICML
- 2012

We present a hybrid algorithm for optimizing a convex, smooth function over the cone of positive semidefinite matrices. Our algorithm converges to the global optimal solution and can be used to solve general large-scale semidefinite programs and hence can be readily applied to a variety of machine learning problems. We show experimental results on three… (More)

- Joachim Giesen, Martin Jaggi, Sören Laue
- ESA
- 2012

We devise a framework for computing an approximate solution path for an important class of parameterized semidefinite problems that is guaranteed to be ε-close to the exact solution path. The problem of computing the entire regularization path for matrix factor-ization problems such as maximum-margin matrix factorization fits into this framework, as well as… (More)

- Joachim Giesen, Martin Jaggi, Sören Laue
- ACM Trans. Algorithms
- 2010

We consider parameterized convex optimization problems over the unit simplex, that depend on one parameter. We provide a simple and efficient scheme for maintaining an ε-approximate solution (and a corresponding ε-coreset) along the entire parameter path. We prove correctness and optimality of the method. Practically relevant instances of the… (More)

- Stefan Funke, Sören Laue, Zvi Lotker, Rouven Naujoks
- Ad Hoc Networks
- 2008

13 Article history: 14 Available online xxxx 15 1 6 a b s t r a c t 17 In this paper, we present approximation algorithms for a variety of problems occurring in 18 the design of energy-efficient wireless communication networks. We first study the k-sta-19 tion network problem, where for a set S of stations and some constant k, one wants to 20 assign… (More)

- Joachim Giesen, Jens K. Mueller, Sören Laue, Sascha Swiercy
- NIPS
- 2012

We consider an abstract class of optimization problems that are parameterized concavely in a single parameter, and show that the solution path along the parameter can always be approximated with accuracy ε > 0 by a set of size O(1/ √ ε). A lower bound of size Ω(1/ √ ε) shows that the upper bound is tight up to a constant factor. We also devise an algorithm… (More)

- Friedrich Eisenbrand, Sören Laue
- Math. Program.
- 2005

We show that a 2-variable integer program, defined by m constraints involving coefficients with at most ϕ bits can be solved with O(m + ϕ) arithmetic operations on rational numbers of size O(ϕ).

- Sören Laue
- STACS
- 2008

Suppose we are given a finite set of points P in R 3 and a collection of polytopes T that are all translates of the same polytope T. We consider two problems in this paper. The first is the set cover problem where we want to select a minimal number of polytopes from the collection T such that their union covers all input points P. The second problem that we… (More)

- Joachim Giesen, Martin Jaggi, Sören Laue
- AISTATS
- 2012

We devise a simple algorithm for computing an approximate solution path for parameter-ized semidefinite convex optimization problems that is guaranteed to be ε-close to the exact solution path. As a consequence, we can compute the entire regularization path for many regularized matrix completion and factorization approaches, as well as nuclear norm or… (More)

- Stefan Funke, Sören Laue
- STACS
- 2007

We consider the problem of assigning powers to nodes of a wireless network in the plane such that a message from a source node s reaches all other nodes within a bounded number k of transmissions and the total amount of assigned energy is minimized. By showing the existence of a coreset of size O(` 1 ǫ ´ 4k) we are able to (1 + ǫ)-approximate the… (More)

- Georgiana Dinu, Stefan Thater, Sören Laue
- HLT-NAACL
- 2012

This paper compares a number of recently proposed models for computing context sensitive word similarity. We clarify the connections between these models, simplify their formulation and evaluate them in a unified setting. We show that the models are essentially equivalent if syntactic information is ignored, and that the substantial performance differences… (More)