[jira] [Closed] (LUCENE-6747) FingerprintFilter - a TokenFilter for clustering/linking purposes

["Mark Harwood (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-6747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Harwood closed LUCENE-6747.
--------------------------------

> FingerprintFilter - a TokenFilter for clustering/linking purposes
> -----------------------------------------------------------------
>
>                 Key: LUCENE-6747
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6747
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: modules/analysis
>            Reporter: Mark Harwood
>            Priority: Minor
>             Fix For: Trunk, 5.4
>
>         Attachments: fingerprintv1.patch, fingerprintv2.patch, fingerprintv3.patch, fingerprintv4.patch
>
>
> A TokenFilter that emits a single token which is a sorted, de-duplicated set of the input tokens.
> This approach to normalizing text is used in tools like OpenRefine[1] and elsewhere [2] to help in clustering or linking texts.
> The implementation proposed here has a an upper limit on the size of the combined token which is output.
> [1] https://github.com/OpenRefine/OpenRefine/wiki/Clustering-In-Depth
> [2] https://rajmak.wordpress.com/2013/04/27/clustering-text-map-reduce-in-python/



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