arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1607.04527cs.DS
收藏

背包约束下曲率有界的单调次模函数的极大化

Maximizing a Monotone Submodular Function with a Bounded Curvature under a Knapsack Constraint

Yuichi Yoshida

摘要:

考虑了背包约束下单调次模函数的极大化问题。我们表明,对于任何固定的$ε> 0$,存在一个多项式时间算法的近似比$1-c/e-ε$,其中$c \in [0,1]$是(总)曲率的输入函数。对于任何$c \in [0,1]$,该近似比接近$ε$。据我们所知,这是第一个结果的背包约束,结合曲率,以获得比$1-1/e$,这是紧一般的次模函数的近似比。作为我们的结果的应用,我们提出了一个多项式时间算法的预算分配问题的改进的近似比。

英文摘要:

We consider the problem of maximizing a monotone submodular function under a knapsack constraint. We show that, for any fixed $ε> 0$, there exists a polynomial-time algorithm with an approximation ratio $1-c/e-ε$, where $c \in [0,1]$ is the (total) curvature of the input function. This approximation ratio is tight up to $ε$ for any $c \in [0,1]$. To the best of our knowledge, this is the first result for a knapsack constraint that incorporates the curvature to obtain an approximation ratio better than $1-1/e$, which is tight for general submodular functions. As an application of our result, we present a polynomial-time algorithm for the budget allocation problem with an improved approximation ratio.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑