Okapi at Trec{6 Automatic Ad Hoc, Vlc, Routing, Ltering and Qsdr Note on Notation
نویسندگان
چکیده
In the tables P means precision at cutoo documents and RPrec means precision after R documents have been retrieved, where R is the number of known relevant documents. TSV means Term Selection Value (see Section 3.1).
منابع مشابه
Okapi at Trecc6 Automatic Ad Hoc, Vlc, Routing, Ltering and Qsdr Note on Notation
Many experiments were concerned with \blind" expansion (i.e. expansion using pseudo-relevant and -nonrelevant documents). A very large number of runs were done on TREC{3, 4 and 5 data to investigate the e ect of varying the Okapi BM25 parameters on precision at low recall. Methods of selecting and ranking topic terms and expansion terms were investigated. In particular, introducing a \non-relev...
متن کاملOkapi at TREC-5
City submitted two runs each for the automatic ad hoc, very large collection track, automatic routing and Chinese track; and took part in the interactive and ltering tracks. There were no very signi cant new developments; the same Okapi-style weighting as in TREC{3 and TREC{4 was used this time round, although there were attempts, in the ad hoc and more notably in the Chinese experiments, to ex...
متن کاملAT&T at TREC-7
This year AT&T participated in the ad-hoc task and the Filtering, SDR, and VLC tracks. Most of our eeort for TREC-7 was concentrated on SDR and VLC tracks. On the ltering track, we tested a preliminary version of a text classiication toolkit that we have been developing over the last year. In the ad-hoc task, we introduce a new tf-factor in our term weighting scheme and use a simpliied retrieva...
متن کاملOkapi at TREC{7: automatic ad hoc, ltering, VLC and interactive track
Three runs were submitted: medium (title and description), short (title only) and a run which was a combination of a long run (title, description and narrative) with the medium and short runs. The average precision of the last mentioned run was higher by several percent than any other submitted run, but another participant recently noticed an impossibly high score for one topic in the short run...
متن کاملOkapi at TREC-3
During the course of TREC{1 the low-level search functions were split o into a separate Basic Search System (BSS) [2], but retrieval and ranking of documents was still done using the \classical" probabilistic model of Robertson and Sparck Jones[7] with no account taken of document length or term frequency within document or query. Four runs were submitted to NIST for evaluation: automatic ad ho...
متن کامل