[developers] Handling unknown lexical entries with ACE parsing

Francis Bond bond at ieee.org
Fri Jan 13 04:25:00 CET 2017

Thanks Woodley.

We could also use word shape and the token mapping to map generic entities,

On Thu, Jan 12, 2017 at 3:55 PM, Woodley Packard <sweaglesw at sweaglesw.org>

> Hi Olga and Francis,
> If what you want to do is define certain generic lexemes that apply to all
> words, you do not need a POS tagger at all.  You will need to enable token
> mapping, but not necessarily write any token mapping rules.  Next you need
> to create some lexical entries whose TDL status is "generic-lex-entry".
> Each one of these will get instantiated on every token, so some caution
> will be wise.  The token feature structure gets unified into a
> grammar-defined path into the lexeme it licenses, so the explosion can be
> controlled by making constraints at that path.  When POS tagging is used,
> the POS info lives on the token feature structures, and typical
> unknown-word-aware DELPH-IN grammars use constraints on generic lexical
> entries’ tokens’ POS values to select which generic lexical entry applies
> in which POS situations.  You can also use the so-called "lexical
> filtering" stage to throw out some generic (or native if you want) lexical
> entries.  See the ERG’s lfr.tdl for examples (Dan uses this to discard
> generic lexemes proposed by the tagger in situations where the grammar has
> native lexical coverage).
> If you find that you need help getting some portions of this airborne, let
> me know.
> Regards,
> Woodley
> On Jan 10, 2017, at 9:28 PM, Francis Bond <bond at ieee.org> wrote:
> There is some discussion here (for PET):
> http://moin.delph-in.net/PetInput
> the chart mapping approach also works for ACE.
> You have to use an external POS tagger (which you could fake if all
> unknown words get the same POS).
> We have this working for Zhong and Jacy (and I think INDRA).  I would be
> happy to walk you through it if you promise to enhance the documentation
> :-).
> On Tue, Jan 10, 2017 at 4:57 PM, Olga Zamaraeva <olzama at uw.edu> wrote:
>> Dear Developers,
>> I would like to parse some text (with ACE) using a small grammar and I am
>> likely to encounter stems that I do not have in the lexicon. My
>> understanding is that it is possible to add a generic lexical entry for
>> e.g. "verb", and analyze some of the unknown words morphologically this
>> way. I am looking for any documentation/advice on how this is done. Would
>> anyone be able to point me to anything?
>> Thank you,
>> Olga
> --
> Francis Bond <http://www3.ntu.edu.sg/home/fcbond/>
> Division of Linguistics and Multilingual Studies
> Nanyang Technological University

Francis Bond <http://www3.ntu.edu.sg/home/fcbond/>
Division of Linguistics and Multilingual Studies
Nanyang Technological University
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