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Table 2 Evaluation criteria for the three entity recognition tasks

From: Entity recognition from clinical texts via recurrent neural network

Challenge Criterion Remarks
2010 Exact* Entities have the same boundary and same type.
Inexact Entities overlap and have the same type.
2012 Span* Entities overlap
Type Entities overlap and have the same type.
2014 Exact* Entities have the same boundary and same type.
Token “Exact” criterion at token-level.
  1. *represents the primary evaluation criterion for each task