This package implements orthogonal projective non-negative matrix factorization as described in:
Z. Yang and E. Oja, "Linear and Nonlinear Projective Nonnegative Matrix Factorization," in IEEE Transactions on Neural Networks, vol. 21, no. 5, pp. 734-749, May 2010, doi: 10.1109/TNN.2010.2041361.
If you use this software, consider citing:
Sotiras A, Resnick SM, Davatzikos C. Finding imaging patterns of structural covariance via Non-Negative Matrix Factorization. Neuroimage. 2015;108:1-16. doi:10.1016/j.neuroimage.2014.11.045