Maria das Graças Volpe Nunes

Also published as: Maria das Gracas Volpe, Maria das Gracas Volpe Nunes, Maria das Graças, Maria das Graças Nunes, Maria das Graças V. Nunes, Maria das Graças Volpe Nunes, Maria das Graças Volpe Nunes


2018

pdf bib
Building a Sentiment Corpus of Tweets in Brazilian Portuguese
Henrico Brum | Maria das Graças Volpe Nunes
Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018)

2016

pdf bib
Exploring Word Embeddings for Unsupervised Textual User-Generated Content Normalization
Thales Felipe Costa Bertaglia | Maria das Graças Volpe Nunes
Proceedings of the 2nd Workshop on Noisy User-generated Text (WNUT)

Text normalization techniques based on rules, lexicons or supervised training requiring large corpora are not scalable nor domain interchangeable, and this makes them unsuitable for normalizing user-generated content (UGC). Current tools available for Brazilian Portuguese make use of such techniques. In this work we propose a technique based on distributed representation of words (or word embeddings). It generates continuous numeric vectors of high-dimensionality to represent words. The vectors explicitly encode many linguistic regularities and patterns, as well as syntactic and semantic word relationships. Words that share semantic similarity are represented by similar vectors. Based on these features, we present a totally unsupervised, expandable and language and domain independent method for learning normalization lexicons from word embeddings. Our approach obtains high correction rate of orthographic errors and internet slang in product reviews, outperforming the current available tools for Brazilian Portuguese.

2015

pdf bib
A Normalizer for UGC in Brazilian Portuguese
Magali Sanches Duran | Maria das Graças Volpe Nunes | Lucas Avanço
Proceedings of the Workshop on Noisy User-generated Text

2014

pdf bib
NILC_USP: An Improved Hybrid System for Sentiment Analysis in Twitter Messages
Pedro Balage Filho | Lucas Avanço | Thiago Pardo | Maria das Graças Volpe Nunes
Proceedings of the 8th International Workshop on Semantic Evaluation (SemEval 2014)

pdf bib
A Large Corpus of Product Reviews in Portuguese: Tackling Out-Of-Vocabulary Words
Nathan Hartmann | Lucas Avanço | Pedro Balage | Magali Duran | Maria das Graças Volpe Nunes | Thiago Pardo | Sandra Aluísio
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

Web 2.0 has allowed a never imagined communication boom. With the widespread use of computational and mobile devices, anyone, in practically any language, may post comments in the web. As such, formal language is not necessarily used. In fact, in these communicative situations, language is marked by the absence of more complex syntactic structures and the presence of internet slang, with missing diacritics, repetitions of vowels, and the use of chat-speak style abbreviations, emoticons and colloquial expressions. Such language use poses severe new challenges for Natural Language Processing (NLP) tools and applications, which, so far, have focused on well-written texts. In this work, we report the construction of a large web corpus of product reviews in Brazilian Portuguese and the analysis of its lexical phenomena, which support the development of a lexical normalization tool for, in future work, subsidizing the use of standard NLP products for web opinion mining and summarization purposes.

2010

pdf bib
Computational Linguistics in Brazil: An Overview
Thiago Pardo | Caroline Gasperin | Helena de Medeiros Caseli | Maria das Graças Nunes
Proceedings of the NAACL HLT 2010 Young Investigators Workshop on Computational Approaches to Languages of the Americas

pdf bib
Distinguishing between Positive and Negative Opinions with Complex Network Features
Diego Raphael Amancio | Renato Fabbri | Osvaldo Novais Oliveira Jr. | Maria das Graças Volpe Nunes | Luciano da Fontoura Costa
Proceedings of TextGraphs-5 - 2010 Workshop on Graph-based Methods for Natural Language Processing

2008

pdf bib
The Automatic Mapping of Princeton WordNet Lexical-Conceptual Relations onto the Brazilian Portuguese WordNet Database
Bento Carlos Dias-da-Silva | Ariani Di Felippo | Maria das Graças Volpe Nunes
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

Princeton WordNet (WN.Pr) lexical database has motivated efficient compilations of bulky relational lexicons since its inception in the 1980´s. The EuroWordNet project, the first multilingual initiative built upon WN.Pr, opened up ways of building individual wordnets, and inter-relating them by means of the so-called Inter-Lingual-Index, an unstructured list of the WN.Pr synsets. Other important initiative, relying on a slightly different method of building multilingual wordnets, is the MultiWordNet project, where the key strategy is building language specific wordnets keeping as much as possible of the semantic relations available in the WN.Pr. This paper, in particular, stresses that the additional advantage of using WN.Pr lexical database as a resource for building wordnets for other languages is to explore possibilities of implementing an automatic procedure to map the WN.Pr conceptual relations as hyponymy, co-hyponymy, troponymy, meronymy, cause, and entailment onto the lexical database of the wordnet under construction, a viable possibility, for those are language-independent relations that hold between lexicalized concepts, not between lexical units. Accordingly, combining methods from both initiatives, this paper presents the ongoing implementation of the WN.Br lexical database and the aforementioned automation procedure illustrated with a sample of the automatic encoding of the hyponymy and co-hyponymy relations.

2007

pdf bib
Extractive Automatic Summarization: Does more Linguistic Knowledge Make a Difference?
Daniel S. Leite | Lucia H. M. Rino | Thiago A. S. Pardo | Maria das Graças V. Nunes
Proceedings of the Second Workshop on TextGraphs: Graph-Based Algorithms for Natural Language Processing

pdf bib
Learning Expressive Models for Word Sense Disambiguation
Lucia Specia | Mark Stevenson | Maria das Graças Volpe Nunes
Proceedings of the 45th Annual Meeting of the Association of Computational Linguistics

pdf bib
USP-IBM-1 and USP-IBM-2: The ILP-based Systems for Lexical Sample WSD in SemEval-2007
Lucia Specia | Maria das Graças | Volpe Nunes | Ashwin Srinivasan | Ganesh Ramakrishnan
Proceedings of the Fourth International Workshop on Semantic Evaluations (SemEval-2007)

2006

pdf bib
Capturing Disjunction in Lexicalization with Extensible Dependency Grammar
Jorge Marques Pelizzoni | Maria das Graças Volpe Nunes
Proceedings of the Third Workshop on Constraints and Language Processing

pdf bib
Multilingual versus Monolingual WSD
Lucia Specia | Maria das Graças Volpe Nunes | Mark Stevenson | Gabriela Castelo Branco Ribeiro
Proceedings of the Workshop on Making Sense of Sense: Bringing Psycholinguistics and Computational Linguistics Together

pdf bib
Translation Context Sensitive WSD
Lucia Specia | Maria das Graças Volpe Nunes | Mark Stevenson
Proceedings of the 11th Annual conference of the European Association for Machine Translation

2002

pdf bib
DIADORIM - A Lexical Database for Brazilian Portuguese
Juliana Galvani Greghi | Ronaldo Teixeira Martins | Maria das Graças Volpe Nunes
Proceedings of the Third International Conference on Language Resources and Evaluation (LREC’02)

2001

pdf bib
The Implementation Process of a Statistical Parser for Brazilian Portuguese
Andréia Gentil Bonfante | Maria das Graças Volpe Nunes
Proceedings of the Seventh International Workshop on Parsing Technologies

2000

pdf bib
An interlingua aiming at communication on the Web: How language-independent can it be?
Ronaldo Teixeira Martins | Lucia Helena Machado Rino | Maria das Gracas Volpe Nunes | Gisele Montilha | Osvaldo Novais de Oliveira
NAACL-ANLP 2000 Workshop: Applied Interlinguas: Practical Applications of Interlingual Approaches to NLP

1992

pdf bib
Explanatory Text Planning in Logic Based Systems
Clarisse Sieckenius de Souza | Maria das Gracas Volpe
COLING 1992 Volume 2: The 14th International Conference on Computational Linguistics