I filed an issue for that. https://issues.apache.org/jira/browse/LUCENE-3832
I'll try to port it myself actually. It shouldn't be a big problem. Dawid On Tue, Feb 28, 2012 at 2:31 PM, Michael McCandless <luc...@mikemccandless.com> wrote: > Neat :) It's like a FuzzyQuery w/ a custom (binary?) cost matrix for > the insert/delete/transposition changes... > > Is the number of edits smallish? Ie you're not concerned about > combinatoric explosion of step 1? > > For steps 2 and 3 you shouldn't use FST at all. Instead, for 2) use > BasicAutomata.makeString(String) on each of your expanded terms, then > BasicOperations.union on all of those automata to make a single > automaton accepting all your expanded terms, then likely call > .determinize() on the resulting automaton (maybe also .minimize() but > I think that may not help). Then pass that automaton to AQ. > > We don't yet have a way to drive a query from an FST, but that would > be an interesting addition. EG you could then support weights as > well, to decide how the terms are scored (if certain OCR errors are > more likely than others). > > Mike McCandless > > http://blog.mikemccandless.com > > On Tue, Feb 28, 2012 at 7:33 AM, Alan Woodward > <alan.woodw...@romseysoftware.co.uk> wrote: >> Hello, >> >> I'm trying to create a Lucene Query that will take a term and expand it to >> include common OCR errors (for example, 'cl' is often misread as 'd', so a >> search for 'clog' should also hit 'dog'). My plan is to do this by >> generating all the possible variants of a term, using an existing list of >> errors, and then somehow mapping this into an AutomatonQuery. I've been >> looking around the o.a.l.util.automaton and o.a.l.util.fst packages on >> trunk, and I *think* that this is possible, but I'm so far failing to work >> out how to put the various bits together. >> >> I'm thinking it should work like this: >> 1) expand query term to sorted list of possible matches >> 2) create an FST over those matches >> 3) plug this FST into an AutomatonQuery subclass. >> >> 1) is easy. It's 2) and 3) I'm having trouble with. >> >> All help gratefully received! >> >> Thanks, >> >> Alan Woodward >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >> For additional commands, e-mail: java-user-h...@lucene.apache.org >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
