Mining the Semantic Web: Requirements for Machine Learning

Mining the Semantic Web: Requirements for Machine Learning

Mining the Semantic Web: Requirements for Machine Learning Fabio Ciravegna, Sam Chapman Presented by Steve Hookway 10/20/05 What is the Semantic Web A way to automate reasoning with web data RDF A uniform way to describe resources

(subject,predicate,object) Ontology Hierarchical structure of data Property restrictions Implicit typing Adding Meta-Data A prerequisite for Semantic Web (SW) is structured knowledge Manual Approach

Too Much data Trust Issues Noise This process needs to be automated Armadillo Automatically annotate web pages Validity based on a number of weak techniques

Redundant Information Rating of Sources Context around a capture (LP) - Extraction of knowledge Makes use of Natural Language Processing (NLP) (LP) Induce tagging rules

Contextual Tagging Generalize NLP and keep best rules Remove covered instances from pool High Precision, Low Recall Recovers rules and constrains their application Correction and Validation Shifts tags to correct position (within d spaces) Validation Heterogeneity Armadillo

Uses weak NLP Uses intra-document relation recognition Requirements Must adapt to different document types Relation Extraction Bootstrapping Learning Armadillo

Unsupervised approach user only validates User cannot drive system towards interesting documents and facts Requirements Identify triples Goal: Bootstrap learning on a large scale User needs a role to guide learning Content Cleaning and

Normalization Armadillo Noise added during unsupervised (LP) Use the multiple weak evidence to help avoid poor seeds Requirements Handle noisy training data Conclusion

Semantic Web Armadillo a tool for IE Meta-Data Evidence Building and Validation Extraction of knowledge (LP) A survey of requirements in mining web content for SW meta-data

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