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MRR put the earlier dict entry first when scores were equal, so a relevant document that tied scored 0 at cutoff 1.
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MRR ranked tied documents by the order they appeared in the dict. A relevant document
bthat tied with an earlierascored 0 at cutoff 1. Ties now break by document id, higher first, in both MRR and capped recall. A higher score still ranks first.test_a_tied_relevant_doc_is_ranked_by_idBefore the change,
MRR@1was 0.0. After it,MRR@1andR_cap@1are 1.0.