|U|, |O| and |E| denote the cardinality of users, objects and ratings, respectively. 〈kU〉 and 〈dO〉 are the average degree of users and objects, respectively. η records the network sparsity.
|U|, |O| and |E| denote the cardinality of users, objects and ratings, respectively. 〈kU〉 and 〈dO〉 are the average degree of users and objects, respectively. η records the network sparsity.