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arXiv · 1904.04828

Lower Bounds for Oblivious Near-Neighbor Search

Kasper Green Larsen·Tal Malkin·Omri Weinstein·Kevin Yeo
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Abstract

We prove an $\Omega(d \lg n/ (\lg\lg n)^2)$ 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 $d = \Theta(\log n)$, our result implies an $\tilde{\Omega}(\lg^2 n)$ 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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Kasper Green Larsen, Tal Malkin, Omri Weinstein, Kevin Yeo. 2019-04-09. Lower Bounds for Oblivious Near-Neighbor Search. https://arxiv.org/abs/1904.04828

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