Before revision:  The first metric, the Exact Entity Match score, evaluates a generation by its coverage of radiology domain entities against the references. The second metric, the Entailing Entity Match score, augments the first metric by introducing a natural language inference model into the entity match process to encourage consistent generations that can be entailed from the references.
After revision:  The first metric, the Exact Entity Match score, evaluates a generation by its coverage of radiology domain entities consistent with the reference, and one that uses natural language inference model into the entity match process to encourage consistent generations that can be entailed from the references.