Eckhard Bick - VISL

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7.4 Machine translation 7.4.1. A teleological judgement perspective Since parsing is not an independent goal in its own right, different parsing schemes should be judged not only in terms of inherent criteria, such as information content and error rate, but also from a teleological perspective. Ultimately, the crucial user based criterion will be which uses a certain parsing scheme is likely to be put to. We have already seen that different syntactic notational systems have to match certain theoretical backgrounds, like functional or generative grammar, and have different uses in teaching (tags vs. PoS colour notation, word based “kryds & bolle” 245 function vs. tree diagrams). Likewise, corpora using tag based flat annotation are easier to search with ordinary string manipulation tools than graphical trees. From a machine translation perspective, the following traits of the Portuguese Constraint Grammar parser seem relevant: ♦ Detailed, word order independent, function tags make it easier to transform source language structure into target language structure, without too many complicated transformation rules. Especially where languages like Portuguese are involved, which - unlike English - permit a great deal of variation in the order of clause level arguments. ♦ It is of great importance for polysemy resolution to know which of a word’s potential valency patterns has been instantiated in a given clause or phrase, and which semantic class fills a given valency slot. Therefore it is advantageous that the parsing formalism can handle the disambiguation of valency tags, selection restrictions and other lexicon derived (originally) secondary semantic tags in the same fashion used for morphology and syntax at the lower parsing levels. ♦ The Constraint Grammar formalism can further be used for the context dependent mapping and disambiguation of translation equivalents that are not listed in the lexicon or not linked to specific secondary tags. ♦ The before mentioned underspecification, in Constraint Grammar, of certain postnominals, co-ordination and free nominal adjuncts becomes an asset when seen from a machine translation perspective: - First, a large part of these cases is “true syntactic ambiguity”, which can only be resolved by the fully contextualised listener/reader. - Second, some of these structural ambiguities (prepositional phrase attachment and co-ordination) are fairly universal, i.e. language independent, so that they can be preserved in translation. Making such ambiguity explicit would only put an unnecessary burden on the intermediate levels of the translation module. 7.4.2. The Progressive Level approach in Machine Translation 245 “Cross & circle”, the icons used in Danish primary schools to denote the (often word based) functions of subject and predicator. - 432 -
I have shown, in chapter 6, how adding an additional (third) layer of Constraint Grammar disambiguation (called portval) can establish discriminators for the resolution of lexicon-specified polysemy, drawing on head-dependent and dependent-head valency instantiation, semantic prototype tags and atomic semantic features. In some cases, however, translation equivalents are so idiosyncratic that they cannot be based exclusively on (disambiguated) tags at the word itself, but must be chosen individually and in a context dependent way. This is achieved by progressing to yet another (fourth) level of CG rules, mapping - and, if necessary, disambiguating - translation equivalents. In my system, translations equivalents can be replaced (a), “post-appended” (b) or “pre-appended” (c). Replacement will normally replace a base form (a1), but can be forced to ignore the later TL 246 inflexion module (sic, a2). Likewise, appended translations (b,c) can be attached to the base form (=) or as an additional, non-inflecting, word (+). (a1) MAP (@komme_//af_/med) TARGET ("acabar" ) (*1 PRP-COM BARRIER CLB/VFIN LINK 0 &>> BARRIER NON-ADV/IN/KC/KOMMA) (*1 >) (*1 CLB-ORD OR
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Eckhard Bick ♠ THE PARSING SYSTEM
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Abstract The dissertation describes
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3.7.2. Making the most of the lexic
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Inflexion tags 451 Syntactic tags 4
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first, - but soon, it would move th
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disambiguated), same level tags (to
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chain, but rather the linguistic co
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2 The lexicomorphological level: St
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The core of PALMORF is written in C
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(d) as part of words. For instance,
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(1) binary search technique: a . .
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acapitã#=#####B(orn)###413 acara#a
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Words with graphical accents often
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2.2.3.2 The inflexional endings lex
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2.2.3.3 The suffix lexicon (1) 1
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Suffix combination rules is also us
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an V a DERP a- [ANT] brad Vi as HV
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"inimigo" ADJ M P "inimigo" N M P
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variable word forms receive '_'- li
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The remaining 2 words of the 4-word
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appear truncated or not, depending
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comparison to the substring consist
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My present linguistic solution 28 i
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In some non-personal proper nouns,
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(i.e., not too complex) derivationa
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2.2.4.5 Abbreviations and sentence
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Another case, where meaning bearing
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2.2.4.6 The human factor: variation
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circumflex-) accented words without
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the tagger tries to identify a word
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xxxar-#1##AaiD######54578 endings-s
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"sombrancelha" N F P '=sobrancelha
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(6) Word class distribution and par
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VFIN 24.96 16 7.77 9 2.46 - - 25 3.
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the present participle by derivatio
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Inflexion tags combine with word cl
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2.2.5.2 The individual word classes
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SPEC "specifiers": independent pron
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WORD FORM and LEXEME CATEGORIES gen
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WORD FORM and LEXEME CATEGORIES dea
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mood VFIN finite IND indicative SUB
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prefixal derivation in verbs comple
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graph. def. characteristics: hyphen
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PP prepositional group de=aluguel
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2.2.5.3 Portuguese particles By ‘
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Deictic adverbs refer to discourse
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algo, algum=tanto, nada, nadinha?,
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quando når, da hvornår quanto [QU
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(1) Language distribution and error
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3 Morphosyntactic disambiguation: T
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(4) "quando" conjunction or adverb
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oth for the simple ambiguities intr
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case of a 3.person possessor, the u
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The fact that these semantic distin
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In (Karlsson et. al, 1995:19ff) an
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meaning- scope someone loves everyb
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• 5. Tags can be integrated as me
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19 0 0 - - - - >= 20 15 1 - - - - t
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Portuguese non-name words. Apart fr
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words: 40.8 10.5 17.9 2.9 0.5 3.1 8
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quite distinct, and few irregular e
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3.3 Borderline ambiguity: The limit
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(5b) They [saw(see) [the girl with
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Choose 'saw', if within the same cl
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ambiguous words), moving them to "l
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(3) modernização "modernizar" N
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3.5.1 Probabilistics: The 'fire a l
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In a brute force approach, for an a
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While undeniably involving more con
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Generative Grammar, introduced and
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node without branches matching the
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example is a grammar of one termina
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wide coverage tagging and parsing t
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ambiguity, Constraint Grammar can a
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syntactic reach of ordinary hand-cr
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“base form-1” .. .. WORD CLAS
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Base forms ("...") are tags like al
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play after base form rules targetin
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The above sequences are examples of
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3.7.2 Making the most of the lexico
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(1) number of CG rules containing a
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Intuitively, one might assume (a) t
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constructions. Something similar is
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are shaded, as well as the sum-colu
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For global context syntactic rules
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In table (4), three types of contex
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ules appear to be slightly more com
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(5a), continued ¡ ¢ number of con
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in the sequential “understanding
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all - 356 978 492 2219 C-percent 39
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3.8 Mapping: From word class to syn
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@ADVL [N-temp ADV PRP #ICL #FS #AS]
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@#AS-A< [ADV-rel] @#AS- @#AS-
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During the project period I have do
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syntactic errors around it, by prov
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1. Orthography and layout normalisa
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Of course, the use of dishesion mar
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S2 para aquele ... está perfeitame
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Parser performance on speech data (
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4 The syntactic level: A dependency
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subjects, but the second subject ca
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(7) SUBJ o [o] DET M S @>N 'the' b
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4.1.2 Dependency relation types: Cl
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(1) Table: Constituent structure ty
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Any further, more detailed, syntact
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discussion are inspired by Perini (
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Thus, we get ”Comeu peixe/bananas
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type-4 adverbials. Second, adverbia
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they all share one, and only one, c
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AB todos estes ambos os uns, uma,
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from personal pronouns, are not mut
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noun. Only very few adjectives (the
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4.2.2 The adpositional group head a
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However, adnominals can point to a
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(g) isso existe (até/nem (nos Esta
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4.3 The verb chain 4.3.1 The predic
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* aspect estar/andar/continuar/segu
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Ordinarily, 'o' is understood as su
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second verb's object 152 ), with so
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different subjects of matrix and su
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case function ± fronting ÷ fronti
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Quando ”quando” ADV @#FS-ADVL
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abalançar a kaste sig ud i at acab
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fazer xt, xd xdr få til at, lade s
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4.4 Clause types and clause functio
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@#ICL- non-finite subclause (combin
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While it is one of the clausality t
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(6) ..., tudo @S< pago @NN mão @
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(1g) Não [queria [comer outro bolo
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Apart from the presence of predicat
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demais [demais] DET M/F S/P @>N ‘
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element is a comparator and the sec
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without a predicator's valency info
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quantifying) cases, indicating adve
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4.5 Under the magnifying glass: Spe
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O assunto eram as ditaduras 2. F E
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The examples show that the normal "
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focusing function to the syntactic
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the quantifying adverbs mais and me
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qual DET @SC> @#FS-KOMP< antes era
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o [o] DET M S @AS< ‘that’ de [d
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[P=predicator, O=object, A=adverbia
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mais=de [mais=de] ADV @>A ‘more
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(2k) Ficou [ficar] V PS 3S IND V
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interno [interno] ADJ M S @N< '-'
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a preposition, por, then allowing f
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4.5.3 Tagging the quantifier 'todo'
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connection with personal pronouns -
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4.5.4 Adverbial function 4.5.4.1 Ar
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explanation for this may be that a
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a [a] DET F S @>N ‘the’ pergun
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carro [carro] N M S @SUBJ> ‘car
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pass the second test ('*De seu novo
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Therefore, the @ADV-@ADVL distincti
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@PIV, @ADV and @SC are - unlike @AD
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heads a "material" PP. The followin
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4.5.4.3 Intensifier adverbs Intensi
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4.5.4.4 Complementiser adverbs: Int
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complementiser in nominal FS or ICL
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hooked AS-relatives (3) they even a
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4.5.4.5 Adverb disambiguation and o
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position: adverb class: A) set oper
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(5b) fits fairly well into the (A)
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antes/depois+de Depois [depois] AD
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While (2c-e) can be described as pr
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In (4d) ter ('have') does have mono
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When the potential subject is post-
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(1) Table: functions of pronominal
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ditador [ditador] N M S @N ‘-’
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In other contexts, para is not usua
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life that the work of different gra
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SPEC DET/SPEC ¬ @#FS/AS-N< artic
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4.6.3 Tree structures for constitue
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dono de restaurante que pilota a pr
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|-@N
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4.7 Elegant underspecification An i
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5 The uses of valency: A bridge fro
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Returning to a research view concer
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5.2 Valency instantiation: From sec
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Note that valency is treated as a f
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REMOVE (@%vt) (0 @%vK) (*1C @
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word order can't be counted on to m
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than by asking ‘is it an A?’ or
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hemisphere membership 218 , - ‘SW
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disambiguate the senses ‘suit’
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In all, the parser uses 16 atomic s
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‘+ uninferable positive feature +
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6.5 A semantic Constraint Grammar I
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capable - by “negative instantiat
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LIST = (@=c @=v @=p @=s @=t) ; LIS
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Page 384 and 385: An example of argument-head polysem
Page 386 and 387: The program module implementing the
Page 388 and 389: REMOVE (@=X) (*1 @%jn BARRIER @NON-
Page 390 and 391: @AUX, 'know how to, can' @MV, 'ta
Page 392 and 393: Note that the MT engine will choose
Page 394 and 395: Even where none of the semantic rul
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Page 398 and 399: O Itamarati +HUM @SUBJ The Itamara
Page 400 and 401: and a morphological CG module may c
Page 402 and 403: • V-trees - vertical tree structu
Page 404 and 405: descriptional complexity: 'full tag
Page 406 and 407: Here, each line of the CG-notation
Page 408 and 409: 7.2 Grammar teaching on the Interne
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Page 418 and 419: The tree structure of the sample se
Page 420 and 421: (5) Syntactic tree structures (VISL
Page 422 and 423: two function tags, since the studen
Page 424 and 425: 7.3 Corpus research In the case of
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Page 430 and 431: The NURC speech corpus (“Norma ur
Page 434 and 435: processors used by translators or l
Page 436 and 437: The following diagram shows how dif
Page 438 and 439: 8 Conclusion: The advantages of inc
Page 440 and 441: - 440 -
Page 442 and 443: Sources: English: EngCG: Karlsson e
Page 444 and 445: (4) Table: syntactic tree structure
Page 446 and 447: lexicon which ensure removal of fal
Page 448 and 449: 8.2 CG Progressive Level Parsing: G
Page 450 and 451: Methodologically, it is commonly cl
Page 452 and 453: $ the dollar sign is used to mark n
Page 454 and 455: @#ICL-AUX< argument verb in verb ch
Page 456 and 457: "unit" noun (e.g. "20 metros") att
Page 458 and 459: SEMANTIC TAGS The tables below prov
Page 460 and 461: ANIMATE NON-HUMAN, NON-MOVING bo 13
Page 462 and 463: stof 136 fabric seda ‘silke’ ma
Page 464 and 465: (-CONCRETE, - MASS, +COUNT) ‘modu
Page 466 and 467: ax 25 plus below: (-CONCRETE, -MASS
Page 468 and 469: cI 199 process (-CONTROL, imperfect
Page 470 and 471: oot search lexicon search takes a w
Page 472 and 473: translation, prepares bilingual lex
Page 474 and 475: in a typical van/von-name chain con
Page 476 and 477: Appendix: Example sentences The fol
Page 478 and 479: é [ser] V PR 3S IND VFIN @FMV quas
Page 480 and 481: será [ser] V FUT 3S IND VFIN @FMV
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julgamento [julgamento] N M S @P< $
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Os [o] DET M P @>N sabonetes [sabo
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parte [parte] N F S @P< de [de] PR
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inesquecíveis [inesquecível] ADJ
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Literature Almeida, Napoleão Mende
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Lindberg, Nikolaj, “Learning Cons
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Alphabetical index Page numbers in
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averbal subclauses;254 finite subcl
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attributive;249 nominal;248 finite
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for auxiliary definition;235;237 pa
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subject identity test;236 subjects
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ERROR: rangecheck OFFENDING COMMAND
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