Priberam’s Question Answering System for Portuguese

Abstract

This paper describes the work done by Priberam in the development of a question answering (QA) system for Portuguese. The system was built using the company's NLP workbench and information retrieval technology. Special focus is given to the question analysis, document and sentence retrieval, and answer extraction stages. The paper discusses the system's performance in the context of the QA@CLEF 2005 evaluation.

Passage retrieval in legal texts

“…The comparison of the PR systems used in the TREC 8 competition [12] shows that the best PR systems are those that are based on density, with the methods of IBM [13] and SiteQ [14] being the most effective ones. The PR systems that participated in the CLEF competition can also be split into these two categories, even if most of them were based on term overlap [15,16,17,18] rather than density [19,20].…”

An Interactive Question-Answer System with Dialogue for a Receptionist Avatar

“…However, there are few systems for the Portuguese, and even less for Brazilian Portuguese. Examples of quality control systems for the portuguese are FOX (FOX) [26], Priberam [7] and SPHINX [29]. FOX is an open domain QA system that responds to biograph questions.…”

Cross Lingual Question Answering Using QRISTAL for CLEF 2006

“…The architecture of the Qristal system is described in different articles (see [1], [2], [8], [9], [10], [11], [12]). Qristal is a complete engine for indexation and answers extraction.…”