A Unified Generative Framework for Various NER Subtasks

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Knowledge Triples

Source Entity	Relationship	Target Entity
Flat NER Task	solvedBy	Token Level Sequence Labelling Method
Named Entity Recognition Task	includes	Discontinuous NER Task
Named Entity Recognition Task	includes	Flat NER Task
Named Entity Recognition Task	includes	Nested NER Task
Nested NER Task	solvedBy	Span Level Classification Method