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From "David Bowen (JIRA)" <>
Subject [jira] Commented: (LUCENE-1532) File based spellcheck with doc frequencies supplied
Date Mon, 02 Feb 2009 02:57:59 GMT


David Bowen commented on LUCENE-1532:

Mark, what is the reason for normalizing the doc frequency values?  Is the point to get some
kind of scale that is comparable with edit distance?

I was assuming that edit distance would remain the primary criterion, and doc frequency would
just be a tie-breaker (as is currently the case for the index-based spellcheck), but I could
well imagine that some less simple combination of the two could give better results.

> File based spellcheck with doc frequencies supplied
> ---------------------------------------------------
>                 Key: LUCENE-1532
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/spellchecker
>            Reporter: David Bowen
>            Priority: Minor
> The file-based spellchecker treats all words in the dictionary as equally valid, so it
can suggest a very obscure word rather than a more common word which is equally close to the
misspelled word that was entered.  It would be very useful to have the option of supplying
an integer with each word which indicates its commonness.  I.e. the integer could be the document
frequency in some index or set of indexes.
> I've implemented a modification to the spellcheck API to support this by defining a DocFrequencyInfo
interface for obtaining the doc frequency of a word, and a class which implements the interface
by looking up the frequency in an index.  So Lucene users can provide alternative implementations
of DocFrequencyInfo.  I could submit this as a patch if there is interest.  Alternatively,
it might be better to just extend the spellcheck API to have a way to supply the frequencies
when you create a PlainTextDictionary, but that would mean storing the frequencies somewhere
when building the spellcheck index, and I'm not sure how best to do that.

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