[jira] Updated: (LUCENE-786) Extended javadocs in spellchecker

["Karl Wettin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karl Wettin updated LUCENE-786:
-------------------------------

    Attachment: spellcheck_javadocs.diff

patch root is trunk/contrib/spellcheck

> Extended javadocs in spellchecker
> ---------------------------------
>
>                 Key: LUCENE-786
>                 URL: https://issues.apache.org/jira/browse/LUCENE-786
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Javadocs
>    Affects Versions: 2.0.0
>            Reporter: Karl Wettin
>            Priority: Trivial
>         Attachments: spellcheck_javadocs.diff
>
>
> Added some javadocs that explains why the spellchecker does not work as one might expect it to.
> http://www.nabble.com/SpellChecker%3A%3AsuggestSimilar%28%29-Question-tf3118660.html#a8640395
> > Without having looked at the code for a long time, I think the problem is what the
> > lucene scoring consider to be best. First the grams are searched, resulting in a number
> > of hits. Then the edit-distance is calculated on each hit. "Genetics" is appearently the
> > third most similar hit according to Lucene, but the best according to Levenshtein.
> >
> > I.e. Lucene does not use edit-distance as similarity. You need to get a bunch of best hits
> > in order to find the one with the smallest edit-distance.
> I took a look at the code, and my assessment seems to be right.

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