S²NMF: Information Self-Enhancement Self-Supervised Nonnegative Matrix Factorization for Recommendation

Table 2

Basic statistical information about the dataset.

Statistical dimension	ML-100 k	ML-1 M	Amusic	Amovie
Number of users	944	6,041	339,232	426,923
Number of items	1,683	3,707	83,047	23,966
Number of interactions	100,000	1,000,209	500,176	583,933
Sparsity	93.70%	95.53%	99.99%	99.99%