lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Elmar Pitschke (JIRA)" <>
Subject [jira] Commented: (LUCENE-2749) Co-occurrence filter
Date Tue, 15 Mar 2011 06:45:29 GMT


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 ;)

> Co-occurrence filter
> --------------------
>                 Key: LUCENE-2749
>                 URL:
>             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.

This message is automatically generated by JIRA.
For more information on JIRA, see:

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message