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https://issues.apache.org/jira/browse/LUCENE-5318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13934959#comment-13934959
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Tim Allison commented on LUCENE-5318:
-------------------------------------
Slightly different use case, but a related idea.
> Co-occurrence counts from Concordance
> -------------------------------------
>
> Key: LUCENE-5318
> URL: https://issues.apache.org/jira/browse/LUCENE-5318
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/search
> Affects Versions: 4.5
> Reporter: Tim Allison
> Labels: patch
> Fix For: 4.7
>
> Attachments: cooccur_v1.patch.gz
>
>
> This patch calculates co-occurrence statistics on search terms within a
> window of x tokens. This can help in synonym discovery and anywhere else
> co-occurrence stats have been used.
> The attached patch depends on LUCENE-5317.
> Again, many thanks to my colleague, Jason Robinson, for advice in developing
> this code and for his modifications to this code to make it more
> Solr-friendly.
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