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Date: Tue, 15 Mar 2011 06:45:29 +0000 (UTC)
From: "Elmar Pitschke (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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In-Reply-To: <27902413.82701289251687007.JavaMail.jira@thor>
Subject: [jira] Commented: (LUCENE-2749) Co-occurrence filter
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    [ https://issues.apache.org/jira/browse/LUCENE-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006812#comment-13006812 ] 

Elmar Pitschke commented on LUCENE-2749:
----------------------------------------

Hi Steven,
thanks for the info, i will work through it and get back here with some questions.
As i have a lot to do with Lucene at my work, this filter would definitely something that i could use. So the work would not be lost ;)
Regards
   Elmar

> Co-occurrence filter
> --------------------
>
>                 Key: LUCENE-2749
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2749
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Analysis
>    Affects Versions: 3.1, 4.0
>            Reporter: Steven Rowe
>            Priority: Minor
>             Fix For: 4.0
>
>
> The co-occurrence filter to be developed here will output sets of tokens that co-occur within a given window onto a token stream.  
> These token sets can be ordered either lexically (to allow order-independent matching/counting) or positionally (e.g. sliding windows of positionally ordered co-occurring terms that include all terms in the window are called n-grams or shingles). 
> The parameters to this filter will be: 
> * window size: this can be a fixed sequence length, sentence/paragraph context (these will require sentence/paragraph segmentation, which is not in Lucene yet), or over the entire token stream (full field width)
> * minimum number of co-occurring terms: >= 2
> * maximum number of co-occurring terms: <= window size
> * token set ordering (lexical or positional)
> One use case for co-occurring token sets is as candidates for collocations.

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