一句话:论文研究一般值 CSP 的 SDP 松弛能力极限,并联系 Sherali-Adams LP 层次与 bounded width 条件。
论文关注一般值约束满足问题(VCSP)的 SDP 松弛极限,并将其与 Sherali-Adams LP 层次及 bounded width 条件联系起来。对一般值约束语言 Γ,核心等价刻画为:任意 VCSP(Γ) 实例可用常数层 Sherali-Adams LP 最优求解;当且仅当可用第三层 Sherali-Adams LP 最优求解;当且仅当 Γ 的 support 满足 bounded width 条件,即包含所有元数的 weak near-unanimity 操作。该刻画将 LP 松弛的最优可解性归约为代数不变量,从而为判断 SDP 等更强松弛能否扩大可解范围提供了边界。
It has been shown that for a general-valued constraint language Γ the following statements are equivalent: (1) any instance of VCSP(Γ) can be solved to optimality using a constant level of the Sherali-Adams LP hierarchy; (2) any instance of VCSP(Γ) can be solved to optimality using the third level of the Sherali-Adams LP hierarchy; (3) the support of Γ satisfies the “bounded width condition”, i.e., it contains weak near-unanimity operations of all arities.
DOI 原文 ·
@inproceedings{paperbot4195,
title = {The limits of SDP relaxations for general-valued CSPs},
author = {Johan Thapper and Stanislav Zivny},
booktitle = {LICS},
year = {2017},
doi = {10.1109/lics.2017.8005087}
}