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Matroid-Based TSP Rounding for Half-Integral Solutions

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arxiv 2111.09290 v2 pith:N3Y73SC5 submitted 2021-11-17 cs.DS

Matroid-Based TSP Rounding for Half-Integral Solutions

classification cs.DS
keywords samplinghalf-integralmax-entropyroundingalgorithmapproachbetterbuild
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We show how to round any half-integral solution to the subtour-elimination relaxation for the TSP, while losing a less-than-1.5 factor. Such a rounding algorithm was recently given by Karlin, Klein, and Oveis Gharan based on sampling from max-entropy distributions. We build on an approach of Haddadan and Newman to show how sampling from the matroid intersection polytope, and a new use of max-entropy sampling, can give better guarantees.

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