Abstract
We propose a search method that uses sentence-based inverted indexes to achieve high accuracy at practical speeds. The proposed method well supports the vast majority of queries entered on the web; these queries contain single words, multiple words for proximity searches, and semantically direct phrases. The existing approach, the inverted index which holds word-level position data is not efficient, because the size of index becomes extremely large. Our solution is to drop the word position data and index only the existence of each word in each sentence. We incorporate the sentence-based inverted index into a commercial search engine and evaluate it using both Japanese and English standard IR corpuses. The experiment shows that our method offers high accuracy, while index size and search processing time are greatly reduced.
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Uematsu, Y., Inoue, T., Fujioka, K., Kataoka, R., Ohwada, H. (2008). Proximity Scoring Using Sentence-Based Inverted Index for Practical Full-Text Search. In: Christensen-Dalsgaard, B., Castelli, D., Ammitzbøll Jurik, B., Lippincott, J. (eds) Research and Advanced Technology for Digital Libraries. ECDL 2008. Lecture Notes in Computer Science, vol 5173. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-87599-4_33
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DOI: https://doi.org/10.1007/978-3-540-87599-4_33
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