Name
Title | ||
|---|---|---|
Experiments with N-Gram Prefixes on a Multinomial Language Model versus Lucene's Off-the-shelf Ranking Scheme and Rocchio Query Expansion (TEL@CLEF Monolingual Task). |
Abstract | ||
|---|---|---|
We describe our participation in the TEL@CLEF task of the CLEF 2009 ad-hoc track, where we measured the retrieval performance of LGTE, an index engine for Geo-Temporal collections which is mostly based on Lucene, together with extensions for query expansion and multinomial language modelling. We experiment an N-Gram stemming model to improve our last year experiments which consisted in combinations of query expansion, Lucene's off-the-shelf ranking scheme and the ranking scheme based on multinomial language modeling. The N-Gram stemming model was based in a linear combination of N-Grams, with N between 2 and 5, using weight factors obtained by learning from last year topics and assessments. The Rocchio ranking function was also adapted to implement this N-Gram model. Results show that this stemming technique together with query expansion and multinomial language modeling both result in increased performance. |
Year | DOI | Venue |
|---|---|---|
2009 | 10.1007/978-3-642-15754-7_10 | CLEF (Working Notes) |
Keywords | DocType | Volume |
increased performance,ranking scheme,clef task,multinomial language,n-gram model,multinomial language modelling,rocchio query expansion,multinomial language modeling,clef monolingual task,n-gram prefix,off-the-shelf ranking scheme,query expansion,rocchio ranking function,language model,vector space model,indexation | Conference | 6241 |
ISSN | ISBN | Citations |
0302-9743 | 3-642-15753-X | 1 |
PageRank | References | Authors |
0.37 | 5 | 3 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Jorge Machado | 1 | 3 | 1.12 |
| Bruno Martins | 2 | 441 | 34.58 |
| José Luis Borbinha | 3 | 151 | 20.02 |