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cs.DB updates on arXiv.org

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Approximate Nearest Neighbor Search for Modern AI: A Proj...
[Submitted on 1 Mar 2026 (v1), last revised 21 Jul 2026 (this ve · 2026-03-02 · via cs.DB updates on arXiv.org

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Abstract:Approximate Nearest Neighbor Search (ANNS) is fundamental to modern AI applications. Most existing solutions optimize query efficiency but fail to align with the practical requirements of modern workloads. In this paper, we outline six critical demands of modern AI applications: high query efficiency, fast indexing, low memory footprint, scalability to high dimensionality, robustness across varying retrieval sizes, and support for online insertions. To satisfy all these demands, we introduce Projection-Augmented Graph (PAG), a new ANNS framework that integrates projection techniques into a graph index. PAG reduces unnecessary exact distance computations through asymmetric comparisons between exact and approximate distances as guided by projection-based statistical tests. Three key components are designed and integrated into the graph index to optimize indexing and searching. Experiments on six modern datasets demonstrate that PAG consistently achieves superior queries per second (QPS)-recall performance -- up to 5x faster than HNSW -- while offering fast indexing speed and moderate memory footprint. PAG remains robust as dimensionality and retrieval size increase and naturally supports online insertions.

Submission history

From: Chuan Xiao [view email]
[v1] Sun, 1 Mar 2026 21:57:42 UTC (1,560 KB)
[v2] Tue, 21 Jul 2026 20:22:01 UTC (1,824 KB)