The number of positive examples per slot and year ranges from 0 (org:member of, 2014) to 581 (per:title, 2013), the number of negative examples from 5 (org:website, 2014) to 1886 (per:title, 2013).
to other relation classification benchmarks, this dataset is not based on a knowledge base (such as Freebase) and unrelated text (such as web documents) but directly on the SF assessments.