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[metric] Popularity-stratified recall
According to Steck & Xin
Implemented in 2da0afd. It would be good to have some examples to check it is correctly implemented.
TODO: check implementation with definition in papers in RecSys 11 [ http://dl.acm.org/citation.cfm?doid=2043932.2043957 ] by the same author and RecSys 12 [ http://dl.acm.org/citation.cfm?id=2365982 ] by other authors
:+1:
Checked! Although test examples are still missing.