Search Results for author: German Rigau

Found 53 papers, 6 papers with code

Multilingual Central Repository: a Cross-lingual Framework for Developing Wordnets

no code implementations1 Jul 2021 Xavier Gómez Guinovart, Itziar Gonzalez-Dios, Antoni Oliver, German Rigau

Language resources are necessary for language processing, but building them is costly, involves many researches from different areas and needs constant updating.

Semi-automatic Generation of Multilingual Datasets for Stance Detection in Twitter

no code implementations28 Jan 2021 Elena Zotova, Rodrigo Agerri, German Rigau

While interactions in social media such as Twitter occur in many natural languages, research on stance detection (the position or attitude expressed with respect to a specific topic) within the Natural Language Processing field has largely been done for English.

Stance Detection

Ask2Transformers: Zero-Shot Domain labelling with Pre-trained Language Models

1 code implementation7 Jan 2021 Oscar Sainz, German Rigau

In this paper we present a system that exploits different pre-trained Language Models for assigning domain labels to WordNet synsets without any kind of supervision.

Domain Labelling

Multilingual Stance Detection in Tweets: The Catalonia Independence Corpus

no code implementations LREC 2020 Elena Zotova, Rodrigo Agerri, Manuel Nu{\~n}ez, German Rigau

The TW-10 referendum Dataset released at IberEval 2018 is a previous effort to provide multilingual stance-annotated data in Catalan and Spanish.

Stance Detection

Towards modelling SUMO attributes through WordNet adjectives: a Case Study on Qualities

no code implementations LREC 2020 Itziar Gonzalez-Dios, Javier Alvez, German Rigau

In this context, we propose a new semi-automatic approach to model the knowledge about properties and attributes in SUMO by exploiting the information encoded in WordNet adjectives and its mapping to SUMO.

NUBES: A Corpus of Negation and Uncertainty in Spanish Clinical Texts

1 code implementation LREC 2020 Salvador Lima, Naiara Perez, Montse Cuadros, German Rigau

This paper introduces the first version of the NUBes corpus (Negation and Uncertainty annotations in Biomedical texts in Spanish).

Multilingual Stance Detection: The Catalonia Independence Corpus

1 code implementation31 Mar 2020 Elena Zotova, Rodrigo Agerri, Manuel Nuñez, German Rigau

The TW-10 Referendum Dataset released at IberEval 2018 is a previous effort to provide multilingual stance-annotated data in Catalan and Spanish.

Stance Detection

Commonsense Reasoning Using WordNet and SUMO: a Detailed Analysis

no code implementations5 Sep 2019 Javier Álvez, Itziar Gonzalez-Dios, German Rigau

Our final objective is the extraction of some guidelines towards a better exploitation of this commonsense knowledge framework by the improvement of the included resources.

Language Independent Sequence Labelling for Opinion Target Extraction

no code implementations28 Jan 2019 Rodrigo Agerri, German Rigau

In this research note we present a language independent system to model Opinion Target Extraction (OTE) as a sequence labelling task.

Aspect-Based Sentiment Analysis

Applying the Closed World Assumption to SUMO-based FOL Ontologies for Effective Commonsense Reasoning

no code implementations14 Aug 2018 Javier Álvez, Itziar Gonzalez-Dios, German Rigau

In this paper, we investigate the application of the Closed World Assumption (CWA) to enable a better exploitation of FOL ontologies by using state-of-the-art automated theorem provers.

Translation

Validating WordNet Meronymy Relations using Adimen-SUMO

no code implementations20 May 2018 Javier Álvez, Itziar Gonzalez-Dios, German Rigau

In this paper, we report on the practical application of a novel approach for validating the knowledge of WordNet using Adimen-SUMO.

Biomedical term normalization of EHRs with UMLS

no code implementations LREC 2018 Naiara Perez, Montse Cuadros, German Rigau

This paper presents a novel prototype for biomedical term normalization of electronic health record excerpts with the Unified Medical Language System (UMLS) Metathesaurus.

Automatic White-Box Testing of First-Order Logic Ontologies

no code implementations29 May 2017 Javier Álvez, Montserrat Hermo, Paqui Lucio, German Rigau

Our proposal enables the detection of defects and serves to certify the grade of suitability --for reasoning purposes-- of every axiom.

Black-box Testing of First-Order Logic Ontologies Using WordNet

no code implementations29 May 2017 Javier Álvez, Paqui Lucio, German Rigau

Applying different quality criteria, our testing proposal enables a successful evaluation of a) the competency of several translations of SUMO into FOL and b) the performance of various automated ATPs.

W2VLDA: Almost Unsupervised System for Aspect Based Sentiment Analysis

no code implementations22 May 2017 Aitor García-Pablos, Montse Cuadros, German Rigau

With the increase of online customer opinions in specialised websites and social networks, the necessity of automatic systems to help to organise and classify customer reviews by domain-specific aspect/categories and sentiment polarity is more important than ever.

Aspect-Based Sentiment Analysis General Classification

Q-WordNet PPV: Simple, Robust and (almost) Unsupervised Generation of Polarity Lexicons for Multiple Languages

no code implementations6 Feb 2017 Iñaki San Vicente, Rodrigo Agerri, German Rigau

This paper presents a simple, robust and (almost) unsupervised dictionary-based method, qwn-ppv (Q-WordNet as Personalized PageRanking Vector) to automatically generate polarity lexicons.

Sentiment Analysis

Multilingual and Cross-lingual Timeline Extraction

no code implementations2 Feb 2017 Egoitz Laparra, Rodrigo Agerri, Itziar Aldabe, German Rigau

In this paper we present an approach to extract ordered timelines of events, their participants, locations and times from a set of multilingual and cross-lingual data sources.

Document-level

Robust Multilingual Named Entity Recognition with Shallow Semi-Supervised Features

1 code implementation31 Jan 2017 Rodrigo Agerri, German Rigau

Finally, the results show that our emphasis on clustering features is crucial to develop robust out-of-domain models.

Named Entity Recognition

A Multilingual Predicate Matrix

no code implementations LREC 2016 Maddalen Lopez de Lacalle, Egoitz Laparra, Itziar Aldabe, German Rigau

This paper presents the Predicate Matrix 1. 3, a lexical resource resulting from the integration of multiple sources of predicate information including FrameNet, VerbNet, PropBank and WordNet.

A Comparison of Domain-based Word Polarity Estimation using different Word Embeddings

no code implementations LREC 2016 Aitor Garc{\'\i}a Pablos, Montse Cuadros, German Rigau

In basic Sentiment Analysis systems this sentiment polarity of the words is accounted and weighted in different ways to provide a degree of positivity/negativity.

Sentiment Analysis Word Embeddings

The Event and Implied Situation Ontology (ESO): Application and Evaluation

no code implementations LREC 2016 Roxane Segers, Marco Rospocher, Piek Vossen, Egoitz Laparra, German Rigau, Anne-Lyse Minard

This paper presents the Event and Implied Situation Ontology (ESO), a manually constructed resource which formalizes the pre and post situations of events and the roles of the entities affected by an event.

Addressing the MFS Bias in WSD systems

no code implementations LREC 2016 Marten Postma, Ruben Izquierdo, Eneko Agirre, German Rigau, Piek Vossen

Word Sense Disambiguation (WSD) systems tend to have a strong bias towards assigning the Most Frequent Sense (MFS), which results in high performance on the MFS but in a very low performance on the less frequent senses.

Word Sense Disambiguation

Improving the Competency of First-Order Ontologies

no code implementations16 Oct 2015 Javier Álvez, Paqui Lucio, German Rigau

We introduce a new framework to evaluate and improve first-order (FO) ontologies using automated theorem provers (ATPs) on the basis of competency questions (CQs).

Evaluating the Competency of a First-Order Ontology

no code implementations16 Oct 2015 Javier Álvez, Paqui Lucio, German Rigau

We report on the results of evaluating the competency of a first-order ontology for its use with automated theorem provers (ATPs).

Predicate Matrix: extending SemLink through WordNet mappings

no code implementations LREC 2014 Maddalen Lopez de Lacalle, Egoitz Laparra, German Rigau

This paper presents the Predicate Matrix v1. 1, a new lexical resource resulting from the integration of multiple sources of predicate information including FrameNet, VerbNet, PropBank and WordNet.

Natural Language Inference Question Answering +2

NewsReader: recording history from daily news streams

no code implementations LREC 2014 Piek Vossen, German Rigau, Luciano Serafini, Pim Stouten, Francis Irving, Willem van Hage

The European project NewsReader develops technology to process daily news streams in 4 languages, extracting what happened, when, where and who was involved.

Multilingual Central Repository version 3.0

no code implementations LREC 2012 Aitor Gonzalez-Agirre, Egoitz Laparra, German Rigau

This paper describes the upgrading process of the Multilingual Central Repository (MCR).

A proposal for improving WordNet Domains

no code implementations LREC 2012 Aitor Gonz{\'a}lez-Agirre, Mauro Castillo, German Rigau

Moreover, it is very difficult to quantify the number of errors in the original version of WND.

Highlighting relevant concepts from Topic Signatures

no code implementations LREC 2012 Montse Cuadros, Llu{\'\i}s Padr{\'o}, German Rigau

Basically, the method applies a knowledge-based Word Sense Disambiguation algorithm to assign the most appropriate WordNet sense to large sets of topically related words acquired from the web, named TSWEB.

Word Sense Disambiguation

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