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https://issues.apache.org/jira/browse/LUCENE-3440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118023#comment-13118023
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sebastian L. edited comment on LUCENE-3440 at 10/4/11 4:51 PM:
---------------------------------------------------------------
WeightOrderFragmentsBuilder_table01.html:
A one-word-query for *testament*. Obviously, the
_sum-of-distinct-weights_-approach makes no difference to the existing one.
||Terms in fragment||totalWeight||totalBoost||
|testament testament|{color:blue}1.8171139{color}|{color:blue}2.0{color}|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
----
WeightOrderFragmentsBuilder_table02.html:
A multi-word-query for *das alte testament*. Obviously, the
_sum-of-boosts_-approach scores *das das das das* higher than *das alte
testament*.
||Terms in fragment||totalWeight||totalBoost||
|das alte testament|{color:blue}5.799069{color}|3.0|
|das alte testament|5.799069|3.0|
|das testament alte|5.799069|3.0|
|das alte testament|5.799069|3.0|
|das testament|2.9178061|2.0|
|das alte|2.9178061|2.0|
|testament testament|1.8171139|2.0|
|das das das das|1.5566137|{color:red}4.0{color}|
|das das das|1.348067|3.0|
|alte|1.2848935|1.0|
|alte|1.2848935|1.0|
|das das|1.100692|2.0|
|das das|1.100692|2.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
----
was (Author: mdz-munich):
WeightOrderFragmentsBuilder_table01.html:
A one-word-query for *testament*. Obviously, the
_sum-of-distinct-weights_-approach makes no difference to the existing one.
||Terms in fragment||totalWeight||totalBoost||
|testament testament|{color:blue}1.8171139{color}|{color:blue}2.0{color}|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
|testament|1.2848935|1.0|
----
WeightOrderFragmentsBuilder_table02.html:
A more-word-query for *das alte testament*. Obviously, the
_sum-of-boosts_-approach scores *das das das das* higher than *das alte
testament*.
||Terms in fragment||totalWeight||totalBoost||
|das alte testament|{color:blue}5.799069{color}|3.0|
|das alte testament|5.799069|3.0|
|das testament alte|5.799069|3.0|
|das alte testament|5.799069|3.0|
|das testament|2.9178061|2.0|
|das alte|2.9178061|2.0|
|testament testament|1.8171139|2.0|
|das das das das|1.5566137|{color:red}4.0{color}|
|das das das|1.348067|3.0|
|alte|1.2848935|1.0|
|alte|1.2848935|1.0|
|das das|1.100692|2.0|
|das das|1.100692|2.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
|das|0.77830684|1.0|
----
Awesome table-formatting!
> 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, 4.0
> Reporter: sebastian L.
> Priority: Minor
> Labels: FastVectorHighlighter
> Fix For: 3.5, 4.0
>
> Attachments: LUCENE-3.5-SNAPSHOT-3440-7.patch,
> LUCENE-4.0-SNAPSHOT-3440-7.patch, weight-vs-boost_table01.html,
> weight-vs-boost_table02.html
>
>
> 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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