Abstract
This manuscript presents the extreme pivots (EP) metric index, a data structure, to speed up exact proximity searching in the metric space model. For the EP, we designed an automatic rule to select the best pivots for a dataset working on limited memory resources. The net effect is that our approach solves queries efficiently with a small memory footprint, and without a prohibitive construction time. In contrast with other related structures, our performance is achieved automatically without dealing directly with the index’s parameters, using optimization techniques over a model of the index. The EP’s model is studied in-depth in this contribution. In practical terms, an interested user only needs to provide the available memory and a sample of the query distribution as parameters. The resulting index is quickly built, and has a good trade-off among memory usage, preprocessing, and search time. We provide an extensive experimental comparison with state-of-the-art searching methods. We also carefully compared the performance of metric indexes in several scenarios, firstly with synthetic data to characterize performance as a function of the intrinsic dimension and the size of the database, and also in different real-world datasets with excellent results.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.