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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4120) FST should use packed integer arrays
Date Mon, 11 Jun 2012 17:09:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292885#comment-13292885
] 

Dawid Weiss commented on LUCENE-4120:
-------------------------------------

I looked at the patch and it looks good to me but I didn't really analyze it in-depth. As
for fst packing, the idea is fairly simple -- you reduce the overall size of the fst by moving
states which have lots incoming arcs to offsets which compress well (in vcoding). At least
I think that's what Mike implemented (Mike is an unpredictable genius :) ).

This presentation has some details:
http://ciaa-fsmnlp-2011.univ-tours.fr/ciaa/upload/files/Weiss-Daciuk.pdf
                
> FST should use packed integer arrays
> ------------------------------------
>
>                 Key: LUCENE-4120
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4120
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/FSTs
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-4120.patch
>
>
> There are some places where an int[] could be advantageously replaced with a packed integer
array.
> I am thinking (at least) of:
>  * FST.nodeAddress (GrowableWriter)
>  * FST.inCounts (GrowableWriter)
>  * FST.nodeRefToAddress (read-only Reader)
> The serialization/deserialization methods should be modified too in order to take advantage
of PackedInts.get{Reader,Writer}.

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