NLP for Shallow Question Answering of Legal Documents Using Graphs

Abstract. Previous work has shown that modeling relationships between articles of a regulation as vertices of a graph network works twice as better than traditional information retrieval systems for returning articles relevant to the question. In this work we experiment by using natural language techniques such as lemmatizing and using manual and automatic thesauri for improving question based document retrieval. For the construction of the graph, we follow the approach of representing the set of all the articles as a graph; the question is split in two parts, and each of them is added as part of the graph. Then several paths are constructed from part A of the question to part B, so that the shortest path contains the relevant articles to the question. We evaluate our method comparing the answers given by a traditional information retrieval system-vector space model adjusted for article retrieval, instead of document retrieval--and the answers to 21 questions given manually by the gene...

• Type: Journal
• Year: 2009
• Where: CICLING
• Authors: Alfredo Monroy, Hiram Calvo, Alexander F. Gelbukh
• Keywords: CICLING 2009, Document Retrieval, Information Retrieval Systems, Natural Language Processing, Traditional Information Retrieval