[developers] PET morphology

[Bart Cramer]

Ah, thanks. I will check it in tomorrow. As said, I can showcase it
with a very small lexicon.

Peter, I heard you were in Sb? Could we meet at some point tomorrow,
or are you too busy?

Bart.

On Wed, Nov 18, 2009 at 11:23 PM, Stephan Oepen <oe at ifi.uio.no> wrote:
> from what you sent, there appears to be a serious bug in PET, but it is not
> actually chaining orthographemic rules.  the [incr tsdb()] derivations sows
> the actual tree, and if one knows how to read the verbose debugging output
> carefully, it shows exactly the same tree.  the lists of rules in square
> brackets indicate remaining orthographemic rules needed for ‘completion’,
> i.e. to satisfy the segmentation hypothesis generated at the string level
> prior to parsing.  so the surprising observation is that an edge with a
> non-empty inflr_todo value (the list in brackets) can qualify as a result.
>
> if you checked the current grammar version into the LOGON tree and emailed
> instructions on how to replicate the problem, maybe peter could be enticed
> to have a look?
>
> best, oe
>
>
>
>
> On 18. nov. 2009, at 21.26, Bart Cramer <bart.cramer at gmail.com> wrote:
>
>> Dear all,
>>
>> I am currently facing the following issue, and I was hoping one of you
>> could help. A feature of the system we have is that morphological rules can
>> form chains. However, I would like to prevent that, and wrote the following
>> supertype for all inflectional rules:
>>
>> lex-infl-rule := lex-rule &
>> [ ARGS   < [ SYNSEM #synsem,
>>            INFL   - ] >,
>>  SYNSEM #synsem,
>>  INFL   + ].
>>
>> However, I still get the chains. For instance, with the following entries
>> in the irregs.tab file, "weißen" is ultimately recognised as a form of the
>> verb "wissen", after applying the two inflectional rules:
>>
>> "
>> weißen IR-ADJ-MW-*-*-PL weiß
>> weiß IR-VERB-NPD-PR-1-SG wissen
>> "
>>
>> with verbose output, I get:
>>
>> (2654 v-slash-none 0 0 1 [root-inf-final] [ir-verb-npd-pr-1-sg
>> ir-adj-mw-*-*-pl]
>>  (2651 v-branch-right 0 0 1 [ir-verb-npd-pr-1-sg ir-adj-mw-*-*-pl]
>>    (2650 ir-verb-npd-inf 0 0 1 [ir-verb-npd-pr-1-sg ir-adj-mw-*-*-pl]
>>      (4 verb-wissen-21/lt-verb-reg-npnom 0 0 1 [ir-verb-npd-inf
>> ir-verb-npd-pr-1-sg ir-adj-mw-*-*-pl]
>>        (1 "weißen" 0 0 1 <0:1>)))))
>>
>> An unexpected result, as the output of the adjectival rule can be chained
>> to other rules, even though that shouldn't unify (because of the INFL
>> feature).
>>
>> When outputting in tsdb, that same reading only 'sees' the last
>> application of a morphological rule (that might be a separate bug):
>>
>> 1 at 9@-1 at -1@-1 at -1@-1 at -1@-1 at -1@(root-inf-final (2654 v-slash-none 0 0 1 (2651
>> v-branch-right 0 0 1 (2650 ir-verb-npd-inf 0 0 1 (4 verb-wissen-21 0 0 1
>> ("weißen" 1 "\\"weißen\\""))))))@@@@
>>
>> The whole thing works fine in LKB, and turning chart mapping on or off
>> doesn't help.
>>
>> Can anybody give me a hint what can be wrong, either in the grammar
>> itself, the settings files, or in PET? I have a little, separate tree, where
>> this issue is singled out (small lexicon), which might speed up debugging.
>> Any help is welcome!
>>
>> Best,
>>
>> Bart.
>