License: Creative Commons Attribution 4.0 International license (CC BY 4.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.APPROX/RANDOM.2023.7
URN: urn:nbn:de:0030-drops-188328
URL: http://dagstuhl.sunsite.rwth-aachen.de/volltexte/2023/18832/
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Bajpai, Tanvi ; Chekuri, Chandra

Bicriteria Approximation Algorithms for Priority Matroid Median

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LIPIcs-APPROX7.pdf (0.9 MB)

Abstract

Fairness considerations have motivated new clustering problems and algorithms in recent years. In this paper we consider the Priority Matroid Median problem which generalizes the Priority k-Median problem that has recently been studied. The input consists of a set of facilities ℱ and a set of clients ? that lie in a metric space (ℱ ∪ ?,d), and a matroid ℳ = (ℱ,ℐ) over the facilities. In addition, each client j has a specified radius r_j ≥ 0 and each facility i ∈ ℱ has an opening cost f_i > 0. The goal is to choose a subset S ⊆ ℱ of facilities to minimize ∑_{i ∈ ℱ} f_i + ∑_{j ∈ ?} d(j,S) subject to two constraints: (i) S is an independent set in ℳ (that is S ∈ ℐ) and (ii) for each client j, its distance to an open facility is at most r_j (that is, d(j,S) ≤ r_j). For this problem we describe the first bicriteria (c₁,c₂) approximations for fixed constants c₁,c₂: the radius constraints of the clients are violated by at most a factor of c₁ and the objective cost is at most c₂ times the optimum cost. We also improve the previously known bicriteria approximation for the uniform radius setting (r_j : = L ∀ j ∈ ?).

BibTeX - Entry

@InProceedings{bajpai_et_al:LIPIcs.APPROX/RANDOM.2023.7,
  author =	{Bajpai, Tanvi and Chekuri, Chandra},
  title =	{{Bicriteria Approximation Algorithms for Priority Matroid Median}},
  booktitle =	{Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2023)},
  pages =	{7:1--7:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-296-9},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{275},
  editor =	{Megow, Nicole and Smith, Adam},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/opus/volltexte/2023/18832},
  URN =		{urn:nbn:de:0030-drops-188328},
  doi =		{10.4230/LIPIcs.APPROX/RANDOM.2023.7},
  annote =	{Keywords: k-median, fair clustering, matroid}
}

Keywords: k-median, fair clustering, matroid
Collection: Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2023)
Issue Date: 2023
Date of publication: 04.09.2023

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