Paper Abstract and Keywords |
Presentation |
2006-07-13 11:45
N.M-gram: Implementation of Inverted Index Using N-gram with Hash Values Mikio Hirabayashi (mixi), Koichiro Eto (AIST) |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
When constructing inverted index for full-text search system, using N-gram is very popular for tokenizing text data of target documents. Although the method has many advantages like language neutrality and perfect recall ratio, it has also shortage that the inverted index becomes large. The tokens extracted from documents tend to be enormous. The system needs to record each offset of tokens into inverted index because the offset is used for checking adjacency of tokens. The inverted index tends to be large because of the offset. In this paper, we describe N.M-gram method, which improves space efficiency of N-gram. The method uses hash values of succeeding tokens instead of offset in each document. The method can improve space efficiency without losing advantages of N-gram. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
N.M-gram / N-gram / inverted index / full-text search / hash / / / |
Reference Info. |
IEICE Tech. Rep., vol. 106, no. 149, DE2006-78, pp. 167-172, July 2006. |
Paper # |
DE2006-78 |
Date of Issue |
2006-07-06 (DE) |
ISSN |
Print edition: ISSN 0913-5685 |
Download PDF |
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Conference Information |
Committee |
DE |
Conference Date |
2006-07-12 - 2006-07-14 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
HOTEL SENKEI |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
Data Engineering, etc. |
Paper Information |
Registration To |
DE |
Conference Code |
2006-07-DE |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
N.M-gram: Implementation of Inverted Index Using N-gram with Hash Values |
Sub Title (in English) |
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N.M-gram |
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N-gram |
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inverted index |
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full-text search |
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hash |
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1st Author's Name |
Mikio Hirabayashi |
1st Author's Affiliation |
mixi, Inc. (mixi) |
2nd Author's Name |
Koichiro Eto |
2nd Author's Affiliation |
National Institute of Advanced Industrial Science and Technology (AIST) |
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Speaker |
Author-1 |
Date Time |
2006-07-13 11:45:00 |
Presentation Time |
20 minutes |
Registration for |
DE |
Paper # |
DE2006-78 |
Volume (vol) |
vol.106 |
Number (no) |
no.149 |
Page |
pp.167-172 |
#Pages |
6 |
Date of Issue |
2006-07-06 (DE) |
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