Date: 2005-02-11T11:19:26
Editor: DanielNaber
Wiki: Jakarta Lucene Wiki
Page: CommunityContributions
URL: http://wiki.apache.org/jakarta-lucene/CommunityContributions
no comment
Change Log:
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@@ -1,14 +1,12 @@
= Community Contributions =
- == Demoting results ==
+== Demoting results ==
-The BoostingQuery class can be used to effectively demote results that match a
given query. Unlike the "NOT" clause, this still selects documents that contain
undesirable terms, but reduces their overall score:
+The !BoostingQuery class can be used to effectively demote results that match
a given query. Unlike the "NOT" clause, this still selects documents that
contain undesirable terms, but reduces their overall score:
- Query balancedQuery =
- new BoostingQuery(positiveQuery, negativeQuery, 0.01f);
+ Query balancedQuery = new !BoostingQuery(positiveQuery, negativeQuery,
0.01f);
In this scenario the positiveQuery contains the mandatory, desirable criteria
which is used to select all matching documents, and the negativeQuery contains
the undesirable elements which are simply used to lessen the scores. Documents
that match the negativeQuery have their score multiplied by the supplied
"boost" parameter, so this should be less than 1 to achieve a demoting effect.
-This code was made available here:
- url: http://marc.theaimsgroup.com/?l=lucene-user&m=108058407130459&w=2 [[BR]]
+This code was made available here:
http://marc.theaimsgroup.com/?l=lucene-user&m=108058407130459&w=2
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