NTCIR-3 PAT Experiments at Osaka Kyoiku University: Long Gram-based Index and Essential Words
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چکیده
Long gram-based indices are experimented at NTCIR-3 patent task. To make gram-based indices, no analyses such as morphological ones are required. The docno, abj, clj and dej tag fields are extracted from NTCIR-3 patent corpus. The total index size is 11.4Gbyte and time to make indices is about 8.7 hours. Median search time per word from abj and dej index is 9.8msec and 91.8msec respectively. Average retrieval time per topic takes 73 seconds since documents are ranked in a Perl program, which is simple and not fast. Ranking algorithm used is based on a traditional probabilistic model. We also tried to set essential words in a query.
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