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https://issues.apache.org/jira/browse/LUCENE-6939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067917#comment-15067917
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ASF subversion and git services commented on LUCENE-6939:
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Commit 1721331 from [~mikemccand] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1721331 ]
LUCENE-6939: add exponential reciprocal scoring mode to BlendedInfixSuggester
> BlendedInfixSuggester to support exponential reciprocal BlenderType
> -------------------------------------------------------------------
>
> Key: LUCENE-6939
> URL: https://issues.apache.org/jira/browse/LUCENE-6939
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/spellchecker
> Affects Versions: 5.4
> Reporter: Arcadius Ahouansou
> Priority: Minor
> Labels: suggester
> Fix For: 5.5, Trunk
>
> Attachments: LUCENE-6939.patch
>
>
> The orignal BlendedInfixSuggester introduced in LUCENE-5354 has support for:
> - {{BlenderType.POSITION_LINEAR}} and
> - {{BlenderType.POSITION_RECIPROCAL}} .
> These are used to score documents based on the position of the matched token
> i.e the closer is the matched term to the beginning, the higher score you get.
> In some use cases, we need a more aggressive scoring based on the position.
> That's where the exponential reciprocal comes into play
> i.e
> {{coef = 1/Math.pow(position+1, exponent)}}
> where the {{exponent}} is a configurable variable.
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