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From "Robert Muir (Commented) (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3846) Fuzzy suggester
Date Sun, 04 Mar 2012 18:50:00 GMT


Robert Muir commented on LUCENE-3846:

Next level for "fuzzy *" in Lucene is going into specifying separate costs for Inserts/deletes,
swaps and transpositions at character(byte) level and optionally considering position of edit.
This brings precision++ if used properly, like in 

Its probably "good enough" for this suggester to allow someone to re-rank their top-N with
a StringDistance []

such things are language and domain-specific and i think just adding this pluggability will
work pretty well, rather than trying to complicate the actual intersection algorithm (which
will ultimately never satisfy everyone anyway).

the default can be "internal metric" which means no re-ranking at all. This is how DirectSpellChecker
works for example.
> Fuzzy suggester
> ---------------
>                 Key: LUCENE-3846
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 3.6, 4.0
>         Attachments: LUCENE-3846.patch
> Would be nice to have a suggester that can handle some fuzziness (like spell correction)
so that it's able to suggest completions that are "near" what you typed.
> As a first go at this, I implemented 1T (ie up to 1 edit, including a transposition),
except the first letter must be correct.
> But there is a penalty, ie, the "corrected" suggestion needs to have a much higher freq
than the "exact match" suggestion before it can compete.
> Still tons of nocommits, and somehow we should merge this / make it work with analyzing
suggester too (LUCENE-3842).

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