Airio, E.; Kettunen, K.: Does dictionary based bilingual retrieval work in a non-normalized index? (2009)
0.01
0.012762025 = product of:
0.0510481 = sum of:
0.0073573855 = weight(_text_:information in 4224) [ClassicSimilarity], result of:
0.0073573855 = score(doc=4224,freq=2.0), product of:
0.06322253 = queryWeight, product of:
1.7554779 = idf(docFreq=20772, maxDocs=44218)
0.036014426 = queryNorm
0.116372846 = fieldWeight in 4224, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.7554779 = idf(docFreq=20772, maxDocs=44218)
0.046875 = fieldNorm(doc=4224)
0.043690715 = weight(_text_:retrieval in 4224) [ClassicSimilarity], result of:
0.043690715 = score(doc=4224,freq=8.0), product of:
0.10894058 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.036014426 = queryNorm
0.40105087 = fieldWeight in 4224, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.046875 = fieldNorm(doc=4224)
0.25 = coord(2/8)
- Abstract
- Many operational IR indexes are non-normalized, i.e. no lemmatization or stemming techniques, etc. have been employed in indexing. This poses a challenge for dictionary-based cross-language retrieval (CLIR), because translations are mostly lemmas. In this study, we face the challenge of dictionary-based CLIR in a non-normalized index. We test two optional approaches: FCG (Frequent Case Generation) and s-gramming. The idea of FCG is to automatically generate the most frequent inflected forms for a given lemma. FCG has been tested in monolingual retrieval and has been shown to be a good method for inflected retrieval, especially for highly inflected languages. S-gramming is an approximate string matching technique (an extension of n-gramming). The language pairs in our tests were English-Finnish, English-Swedish, Swedish-Finnish and Finnish-Swedish. Both our approaches performed quite well, but the results varied depending on the language pair. S-gramming and FCG performed quite equally in all the other language pairs except Finnish-Swedish, where s-gramming outperformed FCG.
- Source
- Information processing and management. 45(2009) no.6, S.703-713