Stable Fractional Matchings
Abstract
We study a generalization of the classical stable matching problem that allows for cardinal preferences (as opposed to ordinal) and fractional matchings (as opposed to integral). After observing that, in this cardinal setting, stable fractional matchings can have much higher social welfare than stable integral ones, our goal is to understand the computational complexity of finding an optimal (i.e., welfare-maximizing) or nearly-optimal stable fractional matching. We present simple approximation algorithms for this problem with weak welfare guarantees and, rather unexpectedly, we furthermore show that achieving better approximations is hard. This computational hardness persists even for approximate stability. To the best of our knowledge, these are the first computational complexity results for stable fractional matchings. En route to these results, we provide a number of structural observations.
Cite
@article{arxiv.1902.06698,
title = {Stable Fractional Matchings},
author = {Ioannis Caragiannis and Aris Filos-Ratsikas and Panagiotis Kanellopoulos and Rohit Vaish},
journal= {arXiv preprint arXiv:1902.06698},
year = {2020}
}
Comments
Accepted to Artificial Intelligence (AIJ)