Only entity type identification happens jointly with relation classification.

University of Michigan - Ann Arbor

It's based on a graph or tree format parsing output and attempts to find the most probable labelling of all of its nodes which corresponds the entity and relation types.

Parsing for Joint Inference

Techniques for Jointly Extracting Entities and Relations: A Survey

It encodes mutual dependencies among the entities and relations in a graph structure which resembles pyramid constructed using playing cards. This is a tree-like graph which has one root at the highest level, internal nodes at intermediate levels and leaves at the lowest level.

Card-pyramid Grammar

1. Entity Productions
2. Relation Productions

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