In HotpotQA, on average we can find 6 candidate chains (2-hop) in a instance, and the human labeled true reasoning chain is unique. A predicted chain is correct if the chain only contains all supporting passages (exact match of passages).

In MedHop, on average we can find 30 candidate chains (3-hop). For each candidate chain our human annotators labeled whether it is correct or not, and the correct reasoning chain is not unique. A predicted chain is correct if it is one of the chains that human labeled as correct.

The accuracy is defined as the ratio: The accuracy is defined as the ratio: 
 Question: What benchmarks are created?
Answer with content missing: (formula) The accuracy is defined as the ratio # of correct chains predicted to # of evaluation samples