[Corpora-List] POS-tagger maintenance and improvement

Dale Gerdemann dg at sfs.nphil.uni-tuebingen.de
Thu Feb 26 09:41:41 CET 2009

Hello all,

It's the same as with technical books. Many authors conscientious keep an errata on their web page. The better authors make a second printing or a second edition of the book. But in the real world, not every author is going to do this. So if the book is important enough to you, then you'd better make your own errata.

If the errors that your tagger makes are systematic enough, then I suppose that the corrections could be applied with a transducer. If you think this is feasible, then collect a bunch of your errors and send them to me, and I will see if I can get a student interested in working on the problem. Starting in April, I'm teaching a B.A. thesis seminar on finite state methods in NLP, and all of my students need projects. So there's a good chance that one of them would be interested in your problem.

Best Regards,

Dale Gerdemann

Adam Kilgarriff wrote:
> All,
> My lexicography colleagues and I use POS-tagged corpora all the time,
> every day, and very frequently spot systematic errors. (This is for a
> range of languages, but particularly English.) We would dearly like
> to be in a dialogue with the developers of the POS-tagger and/or the
> relevant language models so the tagger+model could be improved in
> response to our feedback. (We have been using standard models rather
> than training our own.) However it seems, for the taggers and
> language models we use (mainly TreeTagger, also CLAWS) and also for
> other market leaders, all of which seem to be from Universities, the
> developers have little motivation for continuing the improvement of
> their tagger, since incremental improvements do not make for good
> research papers, so there is nowhere for our feedback to go, nor any
> real prospect of these taggers/models improving.
> Am I too pessimistic? Are there ways of improving language models
> other than developing bigger and better training corpora - not an
> exercise we have the resources to invest in? Are there commercial
> taggers I should be considering (as, in the commercial world, there is
> motivation for incremental improvements and responding to customer
> feedback)?
> Responses and ideas most welcome
> Adam Kilgarriff
> --
> ================================================
> Adam Kilgarriff
> http://www.kilgarriff.co.uk
> Lexical Computing Ltd http://www.sketchengine.co.uk
> Lexicography MasterClass Ltd http://www.lexmasterclass.com
> Universities of Leeds and Sussex adam at lexmasterclass.com
> <mailto:adam at lexmasterclass.com>
> ================================================
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