ABSTRACT:

We have a tendency to generally tend to ponder approaches for similarity search in correlated, high-dimensional information sets, that are derived at intervals a clustering framework. We tend to note that indexing by “vector approximation” (VA-File), that was proposed as a method to combat the “Curse of Dimensionality,” employs scalar quantization, and hence essentially ignores dependencies across dimensions, which represents a provide of suboptimality. Clustering, on the opposite hand, exploits interdimensional correlations and is therefore a a ton of compact illustration of the info set. However, existing strategies to prune irrelevant clusters are based on bounding hyperspheres and/or bounding rectangles, whose lack of tightness compromises their efficiency in actual nearest neighbor search. We tend to propose a whole new cluster-adaptive distance sure primarily based mostly on separating hyperplane boundaries of Voronoi clusters to enhance our cluster based index. This certain permits efficient spatial filtering, with a comparatively small preprocessing storage overhead and is applicable to euclidean and Mahalanobis similarity measures. Experiments in precise nearest-neighbor set retrieval, conducted on real info sets, show that our indexing methodology is scalable with information set size and info dimensionality and outperforms many recently proposed indexes. Relative to the VA-File, over a wide variety of quantization resolutions, it's in a position to reduce random IO accesses, given (roughly) the identical amount of sequential IO operations, by factors reaching 100X and a ton of.


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