Munoz, Javier Vargas
Goncalves, Marcos A.
Torres, Ricardo da S.
Total Authors: 4
 Univ Estadual Campinas, Ave Albert Einstein 1251, Campinas, SP - Brazil
 Univ Fed Minas Gerais, Ave Antonio Carlos 6627, Belo Horizonte, MG - Brazil
Total Affiliations: 2
Web of Science Citations:
This paper presents a novel approach to perform fast approximate nearest neighbors search in high dimensional data, using a nearest neighbor graph created over large collections. This graph is created based on the fusion of multiple hierarchical clustering results, where a minimum-spanning-tree structure is used to connect all elements in a cluster. We propose a novel search technique to guide the navigation on the graph without computing exhaustively the distances to all neighbors in each step of the search, just to those in the direction of the query. The objective is to determine the nearest point to the query with a few number of distance calculations. We experimented in three datasets of 1 million SIFT, GIST, and GloVe features. Results show better speedups than another graph-based technique, and competitive speedups at high recall values when compared to classic and recent state-of-the-art techniques. (C) 2019 Elsevier Ltd. All rights reserved. (AU)