Best poster award for information and language processing researchers
Hosein Azarbonyad and Maarten Marx from the research group Information and Language Processing Systems (Informatics Institute) and Mostafa Dehghani and Jaap Kamps from ILLC have won the best poster award of 37th European Conference on Information Retrieval (ECIR) for their paper entitled: 'Sources of Evidence for Automatic Indexing of Political Texts'.
'Political texts on the Web, documenting laws and policies and the process leading to them, are of key importance to government, industry, and every individual citizen. Yet access to such texts is difficult due to the ever increasing volume and complexity of the content, prompting the need for indexing or annotating them with a common controlled vocabulary or ontology.
In this paper, we investigate the effectiveness of different sources of evidence—such as the labeled training data, textual glosses of descriptor terms, and the thesaurus structure—for automatically indexing political texts. Our main findings are the following. First, using a learning to rank (LTR) approach integrating all features, we observe significantly better performance than previous systems. Second, the analysis of feature weights reveals the relative importance of various sources of evidence, also giving insight in the underlying classification problem. Third, a lean-and-mean system using only four features (text, title, descriptor glosses, descriptor term popularity) is able to perform at 97% of the large LTR model.'