[developers] Reduplication in morpholgy

[Emily M. Bender]

Thanks, Berthold, for the explanation.  This may turn out to be useful
for Lushootseed and Nuu-chah-nulth, though the situation there is somewhat
different.  In particular, I'm intrigued that you are treating __REDUP__ and
the base as separate lexical items.  Is this because of the whitespace
conventions of the language?  Or because it was easier to do things this
way than completely within the morphology?

Also, you said (in a separate exchange we had) that the older solution was
non-compositional ... presumably because you were using the native lex
entry
for the redup form and then squashing its EPs.  Am I understanding
correctly
that this current solution is compositional because the ersatz item is
semantically empty?

Emily


On Sun, Sep 13, 2015 at 6:45 PM, Francis Bond <bond at ieee.org> wrote:

> Thanks Berthold (and Woodley).
>
> This looks very promising, if a bit daunting (my mastery of the chart
> mapping machinery is still shaky).   We will try it out, and probably
> pester
>  you with more questions.
>
> On Mon, Sep 14, 2015 at 8:00 AM, Berthold Crysmann
> <berthold.crysmann at gmail.com> wrote:
> > Hi Francis, Emily, and who else might be listening on this,
> >
> > I have now got a version of my revised analysis working (thanks also to
> > Woodley for fixing a critical issue in ace for me).
> >
> > Here's a brief description (for more details look at the HaG code
> > $LOGONROOT/llf/hag, or ask me):
> >
> > Hausa has some 4 inflectional classes that use total reduplication. While
> > tonal patterns may differ between base and reduplicant, the reduplicant
> does
> > not undergo inflection different from the base. Thus, on the string level
> > (once we have dealt with suprasegmental markings), the reduplicant is
> > faithful to the base (lucky for me). We do get further inflectional
> marking
> > on the base, however.
> >
> > E.g. in plural class 12, we get
> >
> > nâs nâs `nurses'
> > sìkêt sìkêt `skirts'
> > jōjì jōjì `judges'
> >
> > The latter can be morphologically possessed, yielding "jōjì jōjiìnmù"
> (our
> > judges).
> >
> > So in this class, the reduplicant is just a copy of the base lexeme's
> orth
> > value (+ tone + length).
> >
> > A more interesting case are augmentative adjectives. Here the base for
> the
> > productive formation is partially reduplicated in the masc and fem
> singular,
> > but one drops the partial reduplication in the plural, to have total
> > reduplication of a clipped base instead.
> >
> > E.g. class 14:
> >
> > mālàm bundumēmḕ ->  mā̀làmai bundumā bùndùmā̀
> >
> > Which can also undergo type raising, giving
> >
> > bundumā bùndùmàn mā̀làmai
> >
> > Note that the inflection -n on the base does not get copied to the
> > reduplicant.
> >
> >
> > As for the analysis, here is what I now do (in ace):
> >
> > 1. Parsing
> >
> > As a first step, I trigger an ersatz, in token mapping, on every item in
> the
> > chart that is followed by some other item.
> > The surface string I substitute is __REDUP__, which corresponds to
> exactly
> > one lexical item (redup_n).
> > I tried filtering already on this first step on partial identity of form
> > (with regexps), but that did not seem to work. The ersatzing records the
> > original string in +CARG. The rule applies after processing of
> > suprasegmentals (tone and length), and copies that information over as
> well.
> > See tmr/redup.tdl.
> >
> > In a second step, I shall use lexical filtering, which applies after
> lookup
> > and morphological processing, to get rid of unlicensed reduplication
> entries
> > in the chart. I'll probably implement that beginning of next week.
> >
> > During morphological processing, I introduce constraints for the
> reduplicant
> > as part of the morphological rules applying to the base. In particular,
> this
> > enables me to select precisely at which step in the derivation I want to
> > memoise the identity of the base. All the constraints on the reduplicant
> are
> > collected in MORPH.MCLASS.--REDUP. See rule n_pl12_lr (irules.tdl), or,
> even
> > better, n_pl14_lr.
> >
> > In syntax, I use a binary rule to combine the reduplicant ersatz with the
> > base and impose all the constraints the base has for the shape of the
> > reduplicant (rule n-pl-reduplication in rules.tdl).
> >
> > Different plural formation patterns require different levels of identity:
> > e.g. class 12 copies the segments and suprasegmentals of the lexeme,
> whereas
> > class 14 copies the segments of the derived plural and imposes a fixed H+
> > pattern on the reduplicant, and a fixed L+ tone pattern on the base.
> Either
> > of them exempts further inflectional markings from reduplication.
> >
> > This is all done by the  morphological rules applying to  the base, which
> > also store the constraints re the reduplicant in MORPH.--REDUP, having a
> > value for orthography (--STEM string) and suprasegmentals (--SUPRA
> supra).
> > See the rules for class 12 and class 14 in irules.tdl. The binary
> > reduplication rule then imposes these constraints on the reduplicant.
> >
> > Some sample sentences for you to test:
> >
> > joji jojinmu sun zo
> > joji jojin sun zo
> > malamai bunduma bunduma sun zo
> >
> > In the hag directory, you can test with
> >
> > ace -l -g ace/hausa.dat
> >
> > for parsing
> >
> > or with
> >
> > ace -T -g ace/hausa.dat|ace -e -l --show-gen-chart -g ace/hausa.g.dat
> >
> > for generation.
> >
> >
> > 2. Generation
> >
> > Using a single generic entry for all reduplicants, I can now trigger the
> one
> > I need based on very general properties, i.e. plural in Hausa. Look at
> > reduplication.mtr for reference. Since there's only one rule left now,
> it is
> > soon going to move into the main trigger.mtr.
> >
> > Using an ersatz, I have to replace the generic __REDUP__ phonology with
> > something sensible at some point: I use post-generation chart mapping to
> > copy over the relevant string from the base. The relevant rule is the
> third
> > or fourth one down in tmr/post-generation.tdl. Likewise, I copy over the
> > constraints on tone and vowel length (SUPRA) as well, which are imposed
> in
> > the --REDUP.--SUPRA features.
> >
> >
> > 3. Conclusion
> >
> > To summarise, the new solution scales up to open classes, and it is fully
> > supported in ace. As for the LKB, you can test with the ersatz as input,
> > e.g. "__redup__ joji sun zo" parses and generates. Generation will only
> use
> > the ersatz. I shall look into refining my user function to get proper
> > generation output.
> >
> > For the moment, I kept the old analysis alive for testing in the LKB: if
> you
> > type in "nas nas sun zo", you should still get an analysis, and you can
> even
> > generate from it (using the ersatz). In ace, this "native" analysis is
> > disabled by requiring an empty RELS on the reduplicant (as a type
> addendum
> > on the phrasal type), which will filter out the native contentful entry,
> and
> > keep the semantically empty one (the ersatz), thus avoiding any spurious
> > ambiguity. Since the LKB analyses are a superset of the ace analyses,
> there
> > will not be any issue w.r.t. treebanking.
> >
> > As I feel about it, total reduplication is the killer argument for having
> > chart mapping in the LKB, or else for having a complete ace-based
> > development environment.
> >
> > 4. Outlook: Chinese and Indonesian
> >
> > As far as I can tell, my approach for Hausa should be straightforward to
> > port to these two languages. There is the question of the X: you would
> > probably treat that as a morphophonological effect of some rule
> application
> > (I guess). So, given our technologies, the most straightforward thing to
> do
> > is place all morphophonological changes on the base. That leaves you
> free to
> > impose simple total identity on the reduplicant: just choose the right
> > moment in the derivation (thanks to Woodley who has just fixed the
> recording
> > of orth values in ace an hour or two ago). If that should not be viable
> > (there are languages like that), one needs to replicate some of the
> > morphology in token mapping. For reference, look at how the ERG deals
> with
> > plurals of unknown words.
> >
> >
> > All the best,
> >
> > Berthold
> >
> >
> > On 08/09/15 16:26, Berthold Crysmann wrote:
> >>
> >> Hi Francis,
> >>
> >> I guess you only worry about total reduplication. While in principle in
> >> Chinese you could get away with using string unification (thanks to the
> >> script, word length is limited), but specifying the letter set will not
> be
> >> much for for either humans or machines....
> >>
> >> I am currently working on total reduplication in my Hausa grammar. I
> had a
> >> first solution that is non-compositional in the semantics. I.e. I just
> use a
> >> binary rule that glues the stuff together, conditioned on identity of
> >> predicates, but throws away the semantic contribution in the
> reduplicant.
> >> Works in parsing, but needs *item-specific* trigger rules in generation.
> >>
> >> Right now, I am exploring with ersatzing. Things should work well as
> long
> >> as only one of the reduplicants undergoes additional morphology.
> Otherwise,
> >> you'll have to memoise parts of the original string, so you can apply
> >> regular morphophonological changes to the reduplicant. Seems to work in
> the
> >> LKB.
> >>
> >> I shall commit that new analysis very soon. I shall also send you a
> >> detailed description.
> >>
> >> Cheers,
> >>
> >> Berthold
> >>
> >> On 08/09/15 15:28, Francis Bond wrote:
> >>>
> >>> G'day,
> >>>
> >>> we are working with a couple of languages where we would like to be
> >>> able to write lexical rules that do things like:
> >>>
> >>> Take a two character word in Chinese (AB)
> >>> AB -> ABAB
> >>> AB -> AABB
> >>> AB -> AAB
> >>> AB -> ABXAB (where X is fixed by the rule)
> >>> AB -> AXAB
> >>> AB -> AXB
> >>>
> >>> Take a one character word (A):
> >>> A -> AA
> >>> A -> AXA
> >>> A -> AAX
> >>>
> >>> In Indonesian we want to take an arbitrary word and produce a duplicate
> >>> w -> w-w   (kasus -> kasus-kasus)
> >>>
> >>> More examples here:
> >>> http://moin.delph-in.net/LADChineseReduplication
> >>> and
> >>> http://moin.delph-in.net/LADChineseAnotA
> >>>
> >>> Is this (or some of this) possible with the DELPH-IN tools?  If so,
> >>> can someone explain how to do it (or point to a paper or website that
> >>> tells us how to do it)?
> >>>
> >>> Thanks in advance,
> >>>
> >>>
> >>
> >>
> >
> >
> > --
> > Berthold Crysmann<crysmann at linguist.jussieu.fr>
> > CNRS, Laboratoire de linguistique formelle (UMR 7110), U Paris Diderot
> > Case 7031, 5 rue Thomas Mann, 75205 Paris cedex 13
> > Bureau 545, bâtiment Olympe de Gouges, rue Albert Einstein, 75013 Paris
> >
>
>
>
> --
> Francis Bond <http://www3.ntu.edu.sg/home/fcbond/>
> Division of Linguistics and Multilingual Studies
> Nanyang Technological University
>
>


-- 
Emily M. Bender
Professor, Department of Linguistics
Check out CLMS on facebook! http://www.facebook.com/uwclma
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