Non-negative Matrix Factorization (default - nnmf_mm: multiplicative updates. Lee and Sung 2001; optional - nnmf_als: alternating least squares)
Suhai (Timothy) Liu <firstname.lastname@example.org> based on multiplicative updates (Lee and Sung 2001) and alternating least squares algorithm; Lars Kai Hansen's nnmf_als Matlab implementation; Torsten Hothorn's Moore-Penrose inverse function
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