Abstract
Introduction
Okapi at TRECs 2 and 3
During TRECs 2 and 3
ffl the new term-weighting functions were developed
and refined as described in 1, Section 3.2
ffl a method of runtime passage determination and
searching was devised 1, Section 4;
ffl an inefficient but surprisingly effective way of
choosing routing terms was developed 1, Section
6);
ffl and a reasonably effective way of automatically expanding
ad hoc queries with terms from documents
retrieved in a pilot search was developed ...
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