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- W2014016001 abstract "While tuple extraction for a given relation has been an active research area, its dual problem of pattern search-- to find and rank patterns in a principled way-- has not been studied explicitly. In this paper, we propose and address the problem of pattern search, in addition to tuple extraction. As our objectives, we stress reusability for pattern search and scalability of tuple extraction, such that our approach can be applied to very large corpora like the Web. As the key foundation, we propose a conceptual model PRDualRank to capture the notion of precision and recall for both tuples and patterns in a principled way, leading to the rediscovery of the Pattern-Relation Duality-- the formal quantification of the reinforcement between patterns and tuples with the metrics of precision and recall. We also develop a concrete framework for PRDualRank, guided by the principles of a perfect sampling process over a complete corpus. Finally, we evaluated our framework over the real Web. Experiments show that on all three target relations our principled approach greatly outperforms the previous state-of-the-art system in both effectiveness and efficiency. In particular, we improved optimal F-score by up to 64%." @default.
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- W2014016001 date "2011-02-09" @default.
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- W2014016001 title "Searching patterns for relation extraction over the web" @default.
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- W2014016001 doi "https://doi.org/10.1145/1935826.1935933" @default.
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