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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
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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)  
Keyword(1) N.M-gram  
Keyword(2) N-gram  
Keyword(3) inverted index  
Keyword(4) full-text search  
Keyword(5) hash  
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Keyword(7)  
Keyword(8)  
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
Date of Issue 2006-07-06 (DE) 


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