Difference between revisions of "Attribute Extraction"
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* '''Template/Pattern-Learning''' | * '''Template/Pattern-Learning''' | ||
** Learn template contextual patterns using seed-based bootstrapping, and assign probability of attribute based on surrounding context. | ** Learn template contextual patterns using seed-based bootstrapping, and assign probability of attribute based on surrounding context. | ||
| − | * '''Extract | + | * '''Extract then Verify''' |
** Two step procedure: First system uses rules, NER and manually or automatically created patterns to extract all attribute candidates | ** Two step procedure: First system uses rules, NER and manually or automatically created patterns to extract all attribute candidates | ||
** Then verify candidates using a classifier (with features based on the context, pattern values, and dependency path) to trained determine if attribute value is correct for the given individual or should be discarded | ** Then verify candidates using a classifier (with features based on the context, pattern values, and dependency path) to trained determine if attribute value is correct for the given individual or should be discarded | ||
Revision as of 19:20, 30 November 2010
Summary
Attribute Extraction is a problem in the field of information extraction that focuses on identifying properties/features that describe a named entity. Performing attribute extract is often used in disambiguating person names, extracting encylopedic knowledge, and in improving question answering.
Common Approaches
Some approaches to Attribute Extraction include:
- Template/Pattern-Learning
- Learn template contextual patterns using seed-based bootstrapping, and assign probability of attribute based on surrounding context.
- Extract then Verify
- Two step procedure: First system uses rules, NER and manually or automatically created patterns to extract all attribute candidates
- Then verify candidates using a classifier (with features based on the context, pattern values, and dependency path) to trained determine if attribute value is correct for the given individual or should be discarded
- Position Based
- Basing predictions on absolute and relative ordering of where the attribute values typically appear in documents.
- Transitivity-Based
- Using transitivity of attributes across co-occuring entities. Co-occuring entities, such as people mentioned in a given person's biography page, tend to have similar attributes.
- Latent-Based
- Detect attributes that may not directly be mentioned in an article based on a topic-model.
Evaluation
One venue of evaluation for the attribute extraction task has been the Web People Search workshop (WePS: Searching information about entities in the web), which has had a attribute extraction challenge in its past two workshops: WePS-2 Attribute Extraction Subtask Guidelines, WePS-3 Attribute Extraction Subtask Guidelines
