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arXiv 2212.06296cs.DS
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度量TSP的一个(略)改进的确定性近似算法

A (Slightly) Improved Deterministic Approximation Algorithm for Metric TSP

Anna R. Karlin, Nathan Klein, Shayan Oveis Gharan

摘要:

我们表明,最大熵算法可以去随机化(相对于一个特定的目标函数)给出一个确定性的$3/2-ε$近似算法度量TSP的一些$ε> 10^{-36}$。为了得到我们的结果,我们应用条件期望的方法,在以前的工作中被用来证明,该算法的期望成本是最多$3/2-ε$倍的最优解的成本,以子环消除LP构造的目标函数。在这项工作中的证明涉及表明,该目标函数的期望值可以在多项式时间内计算(在算法执行的所有阶段)。

英文摘要:

We show that the max entropy algorithm can be derandomized (with respect to a particular objective function) to give a deterministic $3/2-ε$ approximation algorithm for metric TSP for some $ε> 10^{-36}$. To obtain our result, we apply the method of conditional expectation to an objective function constructed in prior work which was used to certify that the expected cost of the algorithm is at most $3/2-ε$ times the cost of an optimal solution to the subtour elimination LP. The proof in this work involves showing that the expected value of this objective function can be computed in polynomial time (at all stages of the algorithm's execution).

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