[developers] post-reduction lexical gap

[Kristen Howell]

Thanks everyone. I got this parse error a lot with toy grammars that I
produced with the grammar matrix. I don't see lfr.tdl anywhere in those
output grammars. Does anyone know what might be the grammar matrix
equivalent?

On Wed, Dec 20, 2017 at 12:57 AM, Dan Flickinger <danf at stanford.edu> wrote:

> Hi Olga,
>
>
> This error message from ACE occurs when your grammar includes one or more
> token-mapping (preprocessing) rules which conspire to delete all of the
> edges from one of the cells in the initial parse chart, so that the parser
> cannot hope to find a covering analysis.  For the ERG, this occasionally
> happens when I adjust the rules for inserting lexical entries for unknown
> words, and then try to filter some of those added entries in case I already
> have a "native" entry for that word.  I imagine you must have one or more
> rules in a file like the ERG's "lfr.tdl" which discard some unwanted
> entries before parsing.  Try commenting out these rules and see if the
> error message for that sentence disappears. You can see the error just by
> trying to parse that one sentence directly with ACE.
>
>
>  Dan
>
>
> ------------------------------
> *From:* developers-bounces at emmtee.net <developers-bounces at emmtee.net> on
> behalf of Olga Zamaraeva <olzama at uw.edu>
> *Sent:* Tuesday, December 19, 2017 11:07 PM
> *To:* Woodley Packard
> *Cc:* developers at delph-in.net
> *Subject:* Re: [developers] post-reduction lexical gap
>
> Hi Woodley,
>
> At a risk of asking a basic question: What does a lexical gap mean?
>
> Thank you,
> Olga
> On Tue, Dec 19, 2017 at 9:35 PM Woodley Packard <sweaglesw at sweaglesw.org>
> wrote:
>
> Hi all,
>
> This means ACE encountered a lexical gap.  It should not be a rare
> occurrence, at least on non-toy data.
>
> Best, Woodley
>
>
>
> On Dec 19, 2017, at 1:21 PM, Stephan Oepen <oe at ifi.uio.no> wrote:
>
> hi olga,
>
> this looks like an error message from the parsing client, not [incr
> tsdb()] proper.  i would guess maybe ACE?  if so, woodley will likely be
> able to shed more light on this question :-).
>
> best, oe
>
>
> On Tue, 19 Dec 2017 at 19:19 Olga Zamaraeva <olzama at uw.edu> wrote:
>
> Dear developers,
>
> What does the message "post-reduction lexical gap" mean in the context of
> adding an [ incr tsdb() ] profile for regression testing to the Grammar
> Matrix?
>
> Here's the type of line that we sometimes see in home/gold/mytest/parse
>
> 10 at 1@10 at -1@0 at -1@0 at 0@-1 at 0@0 at -1@0 at -1@-1 at -1@-1 at -1@-1 at -1@-1 at -1@-1 at 0@0 at 0@0 at 0
> @-1 at -1@-1 at -1@34728 at -1@-1 at -1@23-6-2013 14:28:24 at post-reduction lexical gap@
>
> This seems problematic but we don't really know what it is at this point.
>
> (Here's a related topic on Discourse: https://delphinqa.
> ling.washington.edu/t/no-parses-when-adding-regression-tests/81/7)
>
> Thank you,
> Olga
>
>
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