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The authors present a generic framework to make wrapper induction algorithms tolerant to noise in the training data. This enables one to learn wrappers in a completely unsupervised manner from automatically and cheaply obtained noisy training data, e.g., using dictionaries and regular expressions. By removing the site-level supervision that wrapper-based techniques require, they are able to perform information extraction at web-scale, with accuracy unattained with existing unsupervised extraction techniques. The system is used in production at Yahoo! and powers live applications.
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