A Probabilistic Approach for Integrating Heterogeneous Knowledge Sources [chapter]

Arnab Dutta, Christian Meilicke, Simone Paolo Ponzetto
2014 Lecture Notes in Computer Science  
Open Information Extraction (OIE) systems like Nell and ReVerb have achieved impressive results by harvesting massive amounts of machine-readable knowledge with minimal supervision. However, the knowledge bases they produce still lack a clean, explicit semantic data model. This, on the other hand, could be provided by full-fledged semantic networks like DBpedia or Yago, which, in turn, could benefit from the additional coverage provided by Web-scale IE. In this paper, we bring these two strains
more » ... of research together, and present a method to align terms from Nell with instances in DBpedia. Our approach is unsupervised in nature and relies on two key components. First, we automatically acquire probabilistic type information for Nell terms given a set of matching hypotheses. Second, we view the mapping task as the statistical inference problem of finding the most likely coherent mapping -i.e., the maximum a posteriori (MAP) mapping -based on the outcome of the first component used as soft constraint. These two steps are highly intertwined: accordingly, we propose an approach that iteratively refines type acquisition based on the output of the mapping generator, and vice versa. Experimental results on gold-standard data indicate that our approach outperforms a strong baseline, and is able to produce everimproving mappings consistently across iterations.
doi:10.1007/978-3-319-07443-6_20 fatcat:3inw5oghifehxfyb2skv764aem