7 documents found, page 1 of 1
Hierarchical Multi-Label Dialog Act Recognition on Spanish Data
Ribeiro, Eugénio; Ribeiro, Ricardo; Matos, David Martins deDialog acts reveal the intention behind the uttered words. Thus, their automatic recognition is important for a dialog system trying to understand its conversational partner. The study presented in this article approaches that task on the DIHANA corpus, whose three-level dialog act annotation scheme poses problems which have not been explored in recent studies. In addition to the hierarchical problem, the two l...
Searching a mixed corpus in the light of the new portuguese orthographic norm
Carvalho, Gracinda; Falé, Isabel; Matos, David Martins de; Rocio, VitorA mixed corpus of Portuguese is one in which texts of different origins produce different spelling variants for the same word. A new norm, which will bring together the written texts produced both in Portugal and Brazil, giving then a more uniform orthography, has been effective since 2009, but what happens in the perspective of search, to corpora created before the norm came into practice, or within the transi...
Robust question answering
Carvalho, Gracinda; Matos, David Martins de; Rocio, VitorA Question Answering (QA) system should provide a short and precise answer to a question in natural language, by searching a large knowledge base consisting of natural language text. The sources of the knowledge base are widely available, for written natural language text is a preferential form of human communication. The information ranges from the more traditional edited texts, for example encyclopaedias or n...
Building and exploring semantic equivalences resources
Carvalho, Gracinda; Matos, David Martins de; Rocio, VitorLanguage resources that include semantic equivalences at word level are common, and its usefulness is well established in text processing applications, as in the case of search. Named entities also play an important role for text based applications, but are not usually covered by the previously mentioned resources. The present work describes the WES base, Wikipedia Entity Synonym base, a freely available resour...
Improving IdSay: a characterization of strengths and weaknesses in question ans...
Carvalho, Gracinda; Matos, David Martins de; Rocio, VitorIdSay is a Question Answering system for Portuguese that participated at QA@CLEF 2008 with a baseline version (IdSayBL). Despite the encouraging results, there was still much room for improvement. The participation of six systems in the Portuguese task, with very good results either individually or in an hypothetical combination run, provided a valuable source of information. We made an analysis of all the answ...
IdSay: question answering for portuguese
Carvalho, Gracinda; Matos, David Martins de; Rocio, VitorIdSay is an open domain Question Answering (QA) system for Portuguese. Its current version can be considered a baseline version, using mainly techniques from the area of Information Retrieval (IR). The only external information it uses besides the text collections is lexical information for Portuguese. It was submitted to the monolingual Portuguese task of the QA track of the Cross-Language Evaluation Forum 200...
Document retrieval for question answering : a quantitative evaluation of text p...
Carvalho, Gracinda; Matos, David Martins de; Rocio, VitorQuestion Answering (QA) has been an area of interest for researchers, in part motivated by the international QA evaluation forums, namely the Text REtrieval Conference (TREC), and more recently, the Cross Language Evaluation Forum (CLEF) through QA@CLEF, that since 2004 includes the Portuguese language. In these forums, a collection of written documents is provided, as well as a set of questions, which are to b...