From: High level feature extraction for the self-taught learning algorithm
 | PCA | NMF | SC |
---|---|---|---|
Number of bases | Less or same | Less, same or more | Less, same or more |
wrt input dimension | Â | Â | Â |
Bases orthogonality | Yes | No | No |
Bases learning | Analytic | Iterative | Iterative |
Data representation | Linear | Non-linear | Non-linear |
Data sign | Any | Positive | Any |
Sparsity | No | Uncontrollable | Adjustable |