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https://issues.apache.org/jira/browse/LUCENE-6818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15105022#comment-15105022
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ASF subversion and git services commented on LUCENE-6818:
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Commit 1725210 from [~rcmuir] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1725210 ]
LUCENE-6818: Add DFISimilarity implementing the divergence from independence
model
> Implementing Divergence from Independence (DFI) Term-Weighting for Lucene/Solr
> ------------------------------------------------------------------------------
>
> Key: LUCENE-6818
> URL: https://issues.apache.org/jira/browse/LUCENE-6818
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/query/scoring
> Affects Versions: 5.3
> Reporter: Ahmet Arslan
> Assignee: Robert Muir
> Priority: Minor
> Labels: similarity
> Fix For: 5.5, Trunk
>
> Attachments: LUCENE-6818.patch, LUCENE-6818.patch, LUCENE-6818.patch,
> LUCENE-6818.patch, LUCENE-6818.patch
>
>
> As explained in the
> [write-up|http://lucidworks.com/blog/flexible-ranking-in-lucene-4], many
> state-of-the-art ranking model implementations are added to Apache Lucene.
> This issue aims to include DFI model, which is the non-parametric counterpart
> of the Divergence from Randomness (DFR) framework.
> DFI is both parameter-free and non-parametric:
> * parameter-free: it does not require any parameter tuning or training.
> * non-parametric: it does not make any assumptions about word frequency
> distributions on document collections.
> It is highly recommended *not* to remove stopwords (very common terms: the,
> of, and, to, a, in, for, is, on, that, etc) with this similarity.
> For more information see: [A nonparametric term weighting method for
> information retrieval based on measuring the divergence from
> independence|http://dx.doi.org/10.1007/s10791-013-9225-4]
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