A New Machine Translation System English to Portuguese Using NooJ

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1 A New Machine Translation System English to Portuguese Using NooJ Anabela Barreiro Universidade do Porto & Linguateca New York University

2 Presentation Outline Structure 1. Introduction - Background 2. Focus MT: Languages, Resources and Application - Functionalities and NooJ Potential 3. Linguistic Challenges: Source Analysis and Cross-Language Phenomena 4. NooJ Dictionaries - Source and Target Dictionaries - Lexical Verbs and Nominalizations + Support Verbs - Source and Target Dicitionaries: Examples 5. NooJ Grammars - Structure: Metagraphs and Subgraphs - Transfer: Examples 6. NooJ Translation Capabilities - Testing 3 Linguistic Issues 7. Word Order - Adjective and Noun in NP 8. Language Specific Representations - Format Differences - Dates 9. Support Verb Constructions - Definition - Transfer Maintains Support Verb - Lexical Verb as Paraphrase - Paraphrases: Lexical Verbs: Examples 10. Conclusions and Prospective - NooJ Potential and Future Features 11. Comments... - and Questions?

3 Introduction Background Relevant Background PhD dissertation topic Bilingual Paraphrases for Machine Translation Previous professional activity Logos (commercial Machine Translation) development of the English-Portuguese language pair collaboration in the English-Spanish and English-Italian language pairs Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

4 Focus MT Languages, Resources and Application Language Pairs English-Portuguese (mainly) and Portuguese-English Romance languages possibly other Resources Conversion of OpenLogos resources Multilingual dictionary of +100,000 cannonical forms (i.e., non-inflected); inflectional paradigms; semantic information, conversion of some syntactic-semantic rules. NOMLEX dictionary of +5,000 nominalizations and dictionary of +300 support verbs (Proteus Project NYU) Application Analysis and formalization in NooJ

5 Focus MT Functionalities and NooJ Potential New Functionalities Not many quantitative results yet in terms of MT, but many resources conversion in progress Interesting Linguistic Aspects of Translation Some good qualitative results and potential for further short-term development Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

6 Linguistic Challenges Source Analysis and Cross-Language Phenomena Even simple sentences deal with issues like: 1- Source analysis PoS ambiguity and homography 2- Cross-language phenomena (source and target related) analysis and generation transfer Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

7 Linguistic Challenges Cross-Language Phenomena + Agreement + Tense and aspect + Passive and active Lunches are paid to all employees > Pagam-se almoços a todos os empregados N1 Aux V(Pass) Prep(to) N2 > V(Refl) N1 Prep(a) N2 + Word order This is a red table > Isto é uma mesa vermelha V Det Adj N > V Det N Adj I gave John a book > Eu dei um livro ao João V N1 Det N2 > V Det N2 Prep(a) Det N1 + Different standards for representation of dates + Support verb constructions and paraphrases Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

8 NooJ Dictionaries Source and Target Dictionaries Source dictionary: Regular NooJ dictionary with link to the target language (additional fields corresponding to the translation) Lemma, POS, Inflectional and derivational information (FLX shows how to inflect; DRV shows how to derive) It can be bilingual or multilingual Target dictionary: Like any NooJ monolingual dictionary but easily convertable into a source bilingual dictionary

9 NooJ Dictionaries Lexical Verbs and Nominalizations + Support Verbs NOMLEX Nominalizations Support Verbs +300

10 NooJ Dictionaries Source and Target Dictionaries: Examples New field With this field added, it becomes also source

11 NooJ Grammars Structure: Metagraphs and Subgraphs Metagraph for Verb Tenses Metagraph Structure Subgraph for Translation of Present Perfect

12 NooJ Grammars Transfer - Examples EN should make decisions > PT devia decidir PT homem alto > EN tal man

13 NooJ Translation Capabilities Testing 3 Linguistic Issues NooJ translation capability for linguistic aspects such as: Word order differences, among others Ex: homem alto > tall man N+A > A+N Different representation of dates Ex: Monday, September the 11th > segunda-feira, 11 de Setembro Support verb constructions and paraphrases Ex: make a visit = visit > fazer uma visita = visitar Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

14 Word Order Adjective and Noun in NP NP Word Order Grammar PT Source Dictionary Test Sentences Concordance PT-EN Translation Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

15 Language Specific Representations Format Differences Languages use different ways of representing: Dates Numerals Addresses Etc.

16 Language Specific Representations Dates Test Sentences Concordance Local Grammar Source Bilingual Dictionary

17 Support Verb Constructions Definition Within the scope of my dissertation, a Support Verb Construction is a phrase which is made up of a Support Verb and a Nominalization, where: 1. the Support Verb is a verb which takes a nominalization as an argument (subj, obj, etc.) and which meets at least one of the following criteria: a) is semantically empty contributing little meaning to the sentence, other than tense, number and person (ex: make in make an arrangement or and take in take a seat) b) shares one or more arguments with the nominalization (ex: in John pays Mary a visit, John is the subject of both pay and visit and Mary is the IO of pay and the DO of visit. 2. the Nominalization carries the meaning of the phrase

18 Support Verb Constructions Transfer Maintains Support Verb Simple Local Grammar Corpora Text Concordance identification and translation EN Source Dictionary

19 Support Verb Constructions Lexical Verb as Paraphrase Corpora Text Simple Local Grammar Concordance identification and translation

20 Support Verb Constructions Paraphrases Lexical Verbs: Examples Simple Local Grammar Metagraph EN Source Dictionary

21 Support Verb Constructions Paraphrases Lexical Verbs: Examples Concordance Identification and Translation Corpora for Testing Local Grammar EN-PT Bilingual Dictionary

22 Conclusions and Prospective NooJ Potential and Future Features NooJ has great potential for Machine Translation Easy to use, flexible and versatile Easy to optimize Useful future features Further optimization and new functionalities Automatic propagation of features like agreement Ability to create simpler, easier-to-build grammars by specification of lemma, for instance Development of an MT module for EN-Romance languages and vice-versa (starting with bilingual paraphrases) Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

23 Feedback... And Questions? Anabela Barreiro Anabela -Barreiro 9th INTEX/NooJ Conference Paris, Belgrade, September June 29th, 1-3, 2006

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