Towards optimal lower bounds for k-median and k-means coresets

V Cohen-Addad, KG Larsen, D Saulpic… - Proceedings of the 54th …, 2022 - dl.acm.org
The (k, z)-clustering problem consists of finding a set of k points called centers, such that the
sum of distances raised to the power of z of every data point to its closest center is …

Improved approximations for Euclidean k-means and k-median, via nested quasi-independent sets

V Cohen-Addad, H Esfandiari, V Mirrokni… - Proceedings of the 54th …, 2022 - dl.acm.org
Motivated by data analysis and machine learning applications, we consider the popular high-
dimensional Euclidean k-median and k-means problems. We propose a new primal-dual …

A survey on approximation in parameterized complexity: Hardness and algorithms

AE Feldmann, E Lee, P Manurangsi - Algorithms, 2020 - mdpi.com
Parameterization and approximation are two popular ways of coping with NP-hard
problems. More recently, the two have also been combined to derive many interesting …

Differentially private clustering: Tight approximation ratios

B Ghazi, R Kumar… - Advances in Neural …, 2020 - proceedings.neurips.cc
We study the task of differentially private clustering. For several basic clustering problems,
including Euclidean DensestBall, 1-Cluster, k-means, and k-median, we give efficient …

Multi-swap k-means++

L Beretta, V Cohen-Addad… - Advances in Neural …, 2023 - proceedings.neurips.cc
Abstract The $ k $-means++ algorithm of Arthur and Vassilvitskii (SODA 2007) is often the
practitioners' choice algorithm for optimizing the popular $ k $-means clustering objective …

Learning-Augmented -means Clustering

JC Ergun, Z Feng, S Silwal, DP Woodruff… - arXiv preprint arXiv …, 2021 - arxiv.org
$ k $-means clustering is a well-studied problem due to its wide applicability. Unfortunately,
there exist strong theoretical limits on the performance of any algorithm for the $ k $-means …

Johnson Coverage Hypothesis: Inapproximability of k-means and k-median in p-metrics

V Cohen-Addad, E Lee - Proceedings of the 2022 Annual ACM-SIAM …, 2022 - SIAM
k-median and k-means are the two most popular objectives for clustering algorithms.
Despite intensive effort, a good understanding of the approximability of these objectives …

On approximability of clustering problems without candidate centers

V Cohen-Addad, CS Karthik, E Lee - Proceedings of the 2021 ACM-SIAM …, 2021 - SIAM
The k-means objective is arguably the most widely-used cost function for modeling
clustering tasks in a metric space. In practice and historically, k-means is thought of in a …

Breaching the 2 LMP Approximation Barrier for Facility Location with Applications to k-Median

V Cohen-Addad Viallat, F Grandoni, E Lee… - Proceedings of the 2023 …, 2023 - SIAM
The Uncapacitated Facility Location (UFL) problem is one of the most fundamental
clustering problems: Given a set of clients C and a set of facilities F in a metric space (C∪ F …

FPT constant-approximations for capacitated clustering to minimize the sum of cluster radii

S Bandyapadhyay, W Lochet, S Saurabh - arXiv preprint arXiv:2303.07923, 2023 - arxiv.org
Clustering with capacity constraints is a fundamental problem that attracted significant
attention throughout the years. In this paper, we give the first FPT constant-factor …