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https://issues.apache.org/jira/browse/LUCENE-3440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13112481#comment-13112481
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S.L. edited comment on LUCENE-3440 at 9/22/11 11:33 AM:
--------------------------------------------------------
No, can't verify that. It's my first patch, maybe I did something wrong. The
patch is built from branch_3x with the subversion-plug-in for Eclipse. I took
the todays branch_3x (Import -> SVN -> Checkout projects ...) a few minutes ago
and patched it (Team -> Apply patch). No problem with my setup.
Another approach:
Assuming a user searches for a single word, he rather would like to see
fragments with a culmination of that word:
{code:title=Boost with number of distinct terms per fragment|borderStyle=dotted}
for( WeightedPhraseInfo phraseInfo : phraseInfoList ){
SubInfo subInfo = new SubInfo( phraseInfo.text, phraseInfo.termsOffsets,
phraseInfo.seqnum );
subInfos.add( subInfo );
Iterator it = phraseInfo.termInfos.iterator();
TermInfo ti;
while ( it.hasNext() ) {
ti = ( TermInfo ) it.next();
distinctTerms.add( ti.text );
totalBoost += ti.weight * phraseInfo.boost;
}
}
totalBoost *= distinctTerms.size();
{code}
was (Author: mdz-munich):
No, can't verify that. It's my first patch, maybe I did something wrong.
The patch is built from branch_3x with the subversion-plug-in for Eclipse. I
took the todays branch_3x (Import -> SVN -> Checkout projects ...) a few
minutes ago and patched it (Team -> Apply patch). No problem with my setup.
Another approach:
Assuming a user searches for a single word, he rather would like to see
fragments with a culmination of that word:
{code:title=Bar.java|borderStyle=solid}
for( WeightedPhraseInfo phraseInfo : phraseInfoList ){
SubInfo subInfo = new SubInfo( phraseInfo.text, phraseInfo.termsOffsets,
phraseInfo.seqnum );
subInfos.add( subInfo );
Iterator it = phraseInfo.termInfos.iterator();
TermInfo ti;
while ( it.hasNext() ) {
ti = ( TermInfo ) it.next();
distinctTerms.add( ti.text );
totalBoost += ti.weight * phraseInfo.boost;
}
}
}
totalBoost *= distinctTerms.size();
{code}
> FastVectorHighlighter: IDF-weighted terms for ordered fragments
> ----------------------------------------------------------------
>
> Key: LUCENE-3440
> URL: https://issues.apache.org/jira/browse/LUCENE-3440
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/highlighter
> Affects Versions: 3.5
> Reporter: S.L.
> Priority: Minor
> Labels: patch
> Fix For: 3.5
>
> Attachments: LUCENE-3440-1.patch
>
>
> The FastVectorHighlighter uses for every term found in a fragment an equal
> weight, which causes a higher ranking for fragments with a high number of
> words or, in the worst case, a high number of very common words than
> fragments that contains *all* of the terms used in the original query.
> This patch provides ordered fragments with IDF-weighted terms:
> total weight = total weight + IDF for unique term per fragment * boost of
> query;
> The ranking-formula should be the same, or at least similar, to that one used
> in org.apache.lucene.search.highlight.QueryTermScorer.
> The patch is simple, but it works for us.
> Some ideas:
> - A better approach would be moving the whole fragments-scoring into a
> separate class.
> - Switch scoring via parameter
> - Exact phrases should be given a even better score, regardless if a
> phrase-query was executed or not
> - edismax/dismax-parameters pf, ps and pf^boost should be observed and
> corresponding fragments should be ranked higher
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