Paper Abstract and Keywords |
Presentation |
2013-02-22 10:00
Grafting Trees A Nearest Neighbor Srarch Algorithm without Distance Computation Yohei Ohtani, Toshikazu Wada, Hiroshi Oike (Wakayama Univ.) PRMU2012-162 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
This report presents a nearest neighbor search algorithm without distance computation. K-D tree based nearest neighbor search algorithm consists of two processes: 1) determine tentative nearest neighbor data by tree search, and 2) A* algorithm based “priority search” to find true nearest neighbor data to the query. The latter process consumes most computational time especially for high dimensional data distributions. We focus on the fact that the nearest neighbor data is essentially determined by the query position in the feature space and the priority search can be replaced by classifiers. In practice, we employ decision trees as classifiers and attach them to the K-D tree leaf nodes. This data structure is named Grafting trees. On this tree, we can find the nearest neighbor data without distance computation. In this data structure, some decision tree leaves can be very deep. For solving this problem, we modified this data structure forgiving distance computation for such leaf nodes. The modified tree is named Hybrid Grafting trees. In the experiments, we compared ANN library with our methods and confirmed the search time is shorter than ANN. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Approximate Nearest Neighbor / Voronoi decomposition / K-D Tree / Grafting Trees / Hybrid Grafting Trees / / / |
Reference Info. |
IEICE Tech. Rep., vol. 112, no. 441, PRMU2012-162, pp. 137-142, Feb. 2013. |
Paper # |
PRMU2012-162 |
Date of Issue |
2013-02-14 (PRMU) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
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PRMU2012-162 |
Conference Information |
Committee |
PRMU |
Conference Date |
2013-02-21 - 2013-02-22 |
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(See Japanese page) |
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Paper Information |
Registration To |
PRMU |
Conference Code |
2013-02-PRMU |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
Grafting Trees A Nearest Neighbor Srarch Algorithm without Distance Computation |
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Keyword(1) |
Approximate Nearest Neighbor |
Keyword(2) |
Voronoi decomposition |
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K-D Tree |
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Grafting Trees |
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Hybrid Grafting Trees |
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1st Author's Name |
Yohei Ohtani |
1st Author's Affiliation |
Wakayama University (Wakayama Univ.) |
2nd Author's Name |
Toshikazu Wada |
2nd Author's Affiliation |
Wakayama University (Wakayama Univ.) |
3rd Author's Name |
Hiroshi Oike |
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Wakayama University (Wakayama Univ.) |
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Speaker |
Author-1 |
Date Time |
2013-02-22 10:00:00 |
Presentation Time |
30 minutes |
Registration for |
PRMU |
Paper # |
PRMU2012-162 |
Volume (vol) |
vol.112 |
Number (no) |
no.441 |
Page |
pp.137-142 |
#Pages |
6 |
Date of Issue |
2013-02-14 (PRMU) |
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