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Fast Locality-Sensitive Hashing Frameworks for Approximate Near Neighbor Search

机译:适用于近似近邻搜索的快速局部敏感哈希框架

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The Indyk-Motwani Locality-Sensitive Hashing (LSH) framework (STOC 1998) is a general technique for constructing a data structure to answer approximate near neighbor queries by using a distribution H over locality-sensitive hash functions that partition space. For a collection of n points, after preprocessing, the query time is dominated by O(n~ρ log n) evaluations of hash functions from H and O(n~ρ) hash table lookups and distance computations where p ∈ (0, 1) is determined by the locality-sensitivity properties of H. It follows from a recent result by Dahlgaard et al. (FOCS 2017) that the number of locality-sensitive hash functions can be reduced to O(log2 n), leaving the query timeto be dominated by O(n~p) distance computations and O(n~ρ log n) additional word-RAM operations. We state this result as a general framework and provide a simpler analysis showing that the number of lookups and distance computations closely match the Indyk-Motwani framework. Using ideas from another locality-sensitive hashing framework by Andoni and Indyk (SODA 2006) we are able to reduce the number of additional word-RAM operations to O(n~ρ).
机译:Indyk-Motwani局部敏感哈希(LSH)框架(STOC 1998)是一种通用技术,可通过在分区空间的局部敏感哈希函数上使用分布H来构造数据结构,以回答近似的近邻查询。对于n个点的集合,在预处理之后,查询时间主要由H()和O(n〜ρ)哈希表查找以及距离计算(其中p∈(0,1)的哈希函数的O(n〜ρlog n)评估决定)是由H的位置敏感性特性决定的。它是根据Dahlgaard等人的最新结果得出的。 (FOCS 2017),可以将对位置敏感的哈希函数的数量减少到O(log2 n),而查询时间则由O(n〜p)距离计算和O(n〜ρlog n)额外的单词控制- RAM操作。我们将此结果陈述为一般框架,并提供了更简单的分析,表明查找次数和距离计算非常接近Indyk-Motwani框架。使用Andoni和Indyk(SODA 2006)提出的另一种对局部性敏感的哈希框架的思想,我们能够将额外的word-RAM运算数量减少为O(n〜ρ)。

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