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Title: Efficient and effective KNN sequence search with approximate ngrams
Authors: Wang, X.
Ding, X.
Tung, A.K.H. 
Zhang, Z.
Issue Date: 2013
Source: Wang, X.,Ding, X.,Tung, A.K.H.,Zhang, Z. (2013). Efficient and effective KNN sequence search with approximate ngrams. Proceedings of the VLDB Endowment 7 (1) : 1-12. ScholarBank@NUS Repository.
Abstract: In this paper, we address the problem of finding k-nearest neighbors (KNN) in sequence databases using the edit distance. Unlike most existing works using short and exact ngram matchings together with a filter-and-refine framework for KNN sequence search, our new approach allows us to use longer but approximate n-gram matchings as a basis of KNN candidates pruning. Based on this new idea, we devise a pipeline framework over a two-level index for searching KNN in the sequence database. By coupling this framework together with several efficient filtering strategies, i.e. the frequency queue and the well-known Combined Algorithm (CA), our proposal brings various enticing advantages over existing works, including 1) huge reduction on false positive candidates to avoid large overheads on candidate verifications; 2) progressive result update and early termination; and 3) good extensibility to parallel computation. We conduct extensive experiments on three real datasets to verify the superiority of the proposed framework. © 2013 VLDB Endowment 21508097/13/09... $ 10.00.
Source Title: Proceedings of the VLDB Endowment
ISSN: 21508097
Appears in Collections:Staff Publications

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