[developers] Edge can be built interactively, but isn't in the chart

[Stephan Oepen]

from memory, i believe the chart display shows edges with a non-empty
orthographemic todo list, i.e. a remaining need to pass through a lexical
rule with an associated orthographemic effect.  this property of edges is
not visible in the interface, and interactive unification may not be paying
attention to it.  upon completion of lexical parsing, only edges with an
empty todo list can go on and feed into syntax rules, so this filter that
is applied by the parser might explain seeming misalignment between the
interactive mode and what actually happens during parsing.

just a wild guess :-), oe


On Mon, 24 Feb 2020 at 18:49 Emily M. Bender <ebender at uw.edu> wrote:

> Dear all,
>
> [Cross-posted to developers and the delphinqa.]
>
> After 16 years of teaching grammar engineering, I thought I'd found all of
> the ways in which one can be in the situation of seemingly being able to
> build an edge through interactive unification which isn't in the chart.
> I've documented all of the ones I know about here:
>
> http://moin.delph-in.net/GeFaqUnifySurprise
>
> Alas, I've found evidence of a new one. Or rather: I'm in that situation
> (together with a student) but none of the cases noted there apply. More
> specifically, with the grammar for Meithei [mni] that can be found here:
>
> http://faculty.washington.edu/ebender/mni-debug.tgz
>
> If we try to analyze this sentence:
>
> yoŋ-siŋ túm-í čá-í
> monkey-PL sleep-NHYP eat-NHYP
> Monkeys sleep and eat.
>
> The LKB and ace both return no parses found. If instead of using the two
> verbs (one intransitive and one transitive but with a dropped object), we
> repeat either one of the verbs, we get the expected parses (with both the
> LKB and ace).
>
> yoŋ-siŋ čá-í čá-í
> yoŋ-siŋ túm-í túm-í
>
> Returning to the non-parsing sentence, and looking at the LKB's parse
> chart, what's missing is the VP-T built out of applying the VP1-TOP-COORD
> rule to the VP-B over čá-í and the VP over túm-í.  Puzzlingly, I can build
> this edge interactively just fine. I've run out of guesses as to why it's
> not showing up in the char and so I thought I'd put this puzzle out in case
> other DELPH-INites might be entertained by it.
>
> Curiously,
> Emily
>
> p.s. Discourse directed me to an earlier discussion about this, where
> @johnca suggested checking that *chart-packing-p* is set to NIL. It is.
>
>
> --
> Emily M. Bender (she/her)
> Howard and Frances Nostrand Endowed Professor
> Department of Linguistics
> Faculty Director, CLMS
> University of Washington
> Twitter: @emilymbender
>
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