Chasing Convex Bodies with Linear Competitive Ratio

Chasing Convex Bodies with Linear Competitive Ratio
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以线性竞比追逐凸体

DOI:
10.1145/3450349
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发表时间:
2021
期刊:
影响因子:
2.5
通讯作者:
Guruganesh, Guru
Guruganesh, Guru
中科院分区:
计算机科学2区
文献类型:
--
作者:
Argue, C. J.;Gupta, Anupam;Tang, Ziye;Guruganesh, Guru

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我们研究了在线追逐凸体的问题:给定凸体序列<?TeX $K_t\subseteq \mathbb {R}^d$?>算法必须以点<?TeX $x_t\in K_t$?>以在线方式(即,<? TeX $x_t$?>在此之前,“?TeX $K_{t+1}$?>已被揭露)。目标是最小化该序列中连续点之间的距离之和。Bubeck等人(STOC 2019年,《?TeX $2^{O(d)}$?>-竞争力算法解决这个问题。我们给出了一个算法,是<?$O(\min(d,\sqrt {d \log T}))$?>-竞争的任何序列的长度<?TeX $T$?>。
We study the problem of chasing convex bodies online: given a sequence of convex bodies <?TeX $K_t\subseteq \mathbb {R}^d$?> the algorithm must respond with points <?TeX $x_t\in K_t$?> in an online fashion (i.e., <?TeX $x_t$?> is chosen before <?TeX $K_{t+1}$?> is revealed). The objective is to minimize the sum of distances between successive points in this sequence. Bubeck et al. (STOC 2019) gave a <?TeX $2^{O(d)}$?>-competitive algorithm for this problem. We give an algorithm that is <?TeX $O(\min (d, \sqrt {d \log T}))$?>-competitive for any sequence of length <?TeX $T$?>.
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