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arXiv 2007.15709cs.DS
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在线向量装箱问题的渐近下界

An Asymptotic Lower Bound for Online Vector Bin Packing

Nikhil Bansal, Ilan Reuven Cohen

摘要:

我们考虑在线向量装箱问题,其中由$d$维向量指定的$n$项必须打包在最少数量的相同$d$维箱中。Azar等人(STOC'13)表明,对于任何在线算法$A$,都存在实例I,使得$A(I)$($A$用来打包$I$的箱数)是$Ω(d/\log^2 d)$乘以$OPT(I)$(用来打包$I$的最小箱数)。然而,在这些情况下,$OPT(I)$只是$O(\log d)$,这使得当$OPT(I) \gg d$时具有更好的渐近竞争比的改进算法的可能性是开放的。我们排除了这一点,表明任何任意函数$q(\cdot)$和任何随机在线算法$A$,存在$I$的实例,使$ E[A(I)] \geq c\cdot d/\log^3d \cdot OPT(I) + q(d)$,对于一些通用常数$c$。

英文摘要:

We consider the online vector bin packing problem where $n$ items specified by $d$-dimensional vectors must be packed in the fewest number of identical $d$-dimensional bins. Azar et al. (STOC'13) showed that for any online algorithm $A$, there exist instances I, such that $A(I)$, the number of bins used by $A$ to pack $I$, is $Ω(d/\log^2 d)$ times $OPT(I)$, the minimal number of bins to pack $I$. However in those instances, $OPT(I)$ was only $O(\log d)$, which left open the possibility of improved algorithms with better asymptotic competitive ratio when $OPT(I) \gg d$. We rule this out by showing that for any arbitrary function $q(\cdot)$ and any randomized online algorithm $A$, there exist instances $I$ such that $ E[A(I)] \geq c\cdot d/\log^3d \cdot OPT(I) + q(d)$, for some universal constant $c$.

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