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https://issues.apache.org/jira/browse/LUCENE-4120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293406#comment-13293406
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Dawid Weiss commented on LUCENE-4120:
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@Adrien: I've uploaded a preprint of the full paper; this is probably a better
link for the JavaDocs
(http://www.cs.put.poznan.pl/dweiss/site/publications/download/fsacomp.pdf).
The docs should also say it's not exactly the same implementation (I used a
simplified simulated annealing to find the local optimum for the number of
states to move; this slows things down a LOT and typically for a marginal gain).
> 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, 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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