Open information extraction (Open IE) extracts relation phrases and their arguments (entities) directly from text. Because it does not rely on a predefined set of relation types, Open IE can capture many kinds of relational facts, making it suitable for open, schema-free relation extraction.

Columbia University

Google

- Open IE for handling open relations
- Relation discovery for handling open relations


Explorations in handling open relations for RE

Relation discovery discovers unseen relation types from unsupervised data. Generative models can be used to treat these relations as latent variables, or relation discovery can be viewed as a clustering task.


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