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Matrix Completion: Approximating the Minimum Diameter

Authors Diptarka Chakraborty, Sanjana Dey

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Author Details

Diptarka Chakraborty
  • National University of Singapore, Singapore
Sanjana Dey
  • National University of Singapore, Singapore

Funding

This work was supported by an MoE AcRF Tier 2 grant (MOE-T2EP20221-0009).

Cite AsGet BibTex

Diptarka Chakraborty and Sanjana Dey. Matrix Completion: Approximating the Minimum Diameter. In 34th International Symposium on Algorithms and Computation (ISAAC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 283, pp. 17:1-17:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)
https://doi.org/10.4230/LIPIcs.ISAAC.2023.17

Abstract

In this paper, we focus on the matrix completion problem and aim to minimize the diameter over an arbitrary alphabet. Given a matrix M with missing entries, our objective is to complete the matrix by filling in the missing entries in a way that minimizes the maximum (Hamming) distance between any pair of rows in the completed matrix (also known as the diameter of the matrix). It is worth noting that this problem is already known to be NP-hard. Currently, the best-known upper bound is a 4-approximation algorithm derived by applying the triangle inequality together with a well-known 2-approximation algorithm for the radius minimization variant. In this work, we make the following contributions: - We present a novel 3-approximation algorithm for the diameter minimization variant of the matrix completion problem. To the best of our knowledge, this is the first approximation result that breaks below the straightforward 4-factor bound. - Furthermore, we establish that the diameter minimization variant of the matrix completion problem is (2-ε)-inapproximable, for any ε > 0, even when considering a binary alphabet, under the assumption that 𝖯 ≠ NP. This is the first result that demonstrates a hardness of approximation for this problem.

Subject Classification

ACM Subject Classification
  • Theory of computation → Approximation algorithms analysis
Keywords
  • Incomplete Data
  • Matrix Completion
  • Hamming Distance
  • Diameter Minimization
  • Approximation Algorithms
  • Hardness of Approximation

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