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https://issues.apache.org/jira/browse/LUCENE-3662?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-3662:
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Attachment: LUCENE-3662_upgrade_moman.patch
ok i found the bug, it was a (no longer valid) optimization in the parser for
this null state case... no longer a problem now.
Tests pass with this patch, which simply upgrades our moman to the latest
revision.
>From here we have to modify the code generator to also generate "T" tables,
>and deal with the new t-position syntax.
> extend LevenshteinAutomata to support transpositions as primitive edits
> -----------------------------------------------------------------------
>
> Key: LUCENE-3662
> URL: https://issues.apache.org/jira/browse/LUCENE-3662
> Project: Lucene - Java
> Issue Type: New Feature
> Affects Versions: 4.0
> Reporter: Robert Muir
> Attachments: LUCENE-3662_upgrade_moman.patch, lev1.rev115.txt,
> lev1.rev119.txt, lev1t.txt, update-moman.patch
>
>
> This would be a nice improvement for spell correction: currently a
> transposition counts as 2 edits,
> which means users of DirectSpellChecker must use larger values of n (e.g. 2
> instead of 1) and
> larger priority queue sizes, plus some sort of re-ranking with another
> distance measure for good results.
> Instead if we can integrate "chapter 7" of
> http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.16.652
> then you can just build an alternative DFA where a transposition is only a
> single edit
> (http://en.wikipedia.org/wiki/Damerau%E2%80%93Levenshtein_distance)
> According to the benchmarks in the original paper, the performance for LevT
> looks to be very similar to Lev.
> Support for this is now in moman (https://bitbucket.org/jpbarrette/moman/)
> thanks to Jean-Philippe
> Barrette-LaPierre.
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