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arXiv 1904.04828cs.DScs.CR
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不经意近邻搜索的下界

Lower Bounds for Oblivious Near-Neighbor Search

Kasper Green Larsen, Tal Malkin, Omri Weinstein, Kevin Yeo

摘要:

我们证明了一个$Ω(d \lg n/ (\lg\lg n)^2)$下界的动态细胞探测复杂度的统计$\mathit{oblivious}$近似近邻搜索($\mathsf{ANN}$)在$d$维汉明立方体。对于$d = Θ(\log n)$的自然设置,我们的结果意味着一个$\tildeΩ(\lg^2 n)$下限,这是对$\mathsf{ANN}$的最高(非遗忘)细胞探针下限的二次改进。这是针对通用(非黑盒)数据结构的$\mathsf{ANN}$的第一个超对数$\mathit{unconditional}$下限。我们还表明,任何不经意的$\mathit{static}$数据结构的可分解的搜索问题(如$\mathsf{ANN}$),可以不经意地动态与$O(\log n)$开销的更新和查询时间,加强了一个经典的结果Bentley和萨克斯(Almica,1980)。

英文摘要:

We prove an $Ω(d \lg n/ (\lg\lg n)^2)$ lower bound on the dynamic cell-probe complexity of statistically $\mathit{oblivious}$ approximate-near-neighbor search ($\mathsf{ANN}$) over the $d$-dimensional Hamming cube. For the natural setting of $d = Θ(\log n)$, our result implies an $\tildeΩ(\lg^2 n)$ lower bound, which is a quadratic improvement over the highest (non-oblivious) cell-probe lower bound for $\mathsf{ANN}$. This is the first super-logarithmic $\mathit{unconditional}$ lower bound for $\mathsf{ANN}$ against general (non black-box) data structures. We also show that any oblivious $\mathit{static}$ data structure for decomposable search problems (like $\mathsf{ANN}$) can be obliviously dynamized with $O(\log n)$ overhead in update and query time, strengthening a classic result of Bentley and Saxe (Algorithmica, 1980).

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