Incremental Nonnegative Matrix Factorization for Face Recognition

Table 2

Running times (s) on FERET database.

Training number	NMF(s)	BNMF(s)	INMF(s)
2	51.14	30.69	21.12
3	74.58	57.02	33.68
4	100.12	75.81	45.34
5	122.61	89.34	56.30