NDLI: Filtering and clustering relations for unsupervised information extraction in open domain

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Filtering and clustering relations for unsupervised information extraction in open domain

Content Provider	ACM Digital Library
Author	Ferret, Olivier Wang, Wei Besançon, Romaric Grau, Brigitte
Abstract	Information Extraction has recently been extended to new areas by loosening the constraints on the strict definition of the extracted information and allowing to design more open information extraction systems. In this new domain of unsupervised information extraction, we focus on the task of extracting and characterizing a priori unknown relations between a given set of entity types. One of the challenges of this task is to deal with the large amount of candidate relations when extracting them from a large corpus. We propose in this paper an approach for the filtering of such candidate relations based on heuristics and machine learning models. More precisely, we show that the best model for achieving this task is a Conditional Random Field model according to evaluations performed on a manually annotated corpus of about one thousand relations. We also tackle the problem of identifying semantically similar relations by clustering large sets of them. Such clustering is achieved by combining a classical clustering algorithm and a method for the efficient identification of highly similar relation pairs. Finally, we evaluate the impact of our filtering of relations on this semantic clustering with both internal measures and external measures. Results show that the filtering procedure doubles the recall of the clustering while keeping the same precision.
Starting Page	1405
Ending Page	1414
Page Count	10
File Format	PDF
ISBN	9781450307178
DOI	10.1145/2063576.2063780
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-10-24
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Unsupervised information extraction Filtering Machine learning Clustering
Content Type	Text
Resource Type	Article

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