Symbols                 30 Images Containing 4 Different Symbols.
Symbols_c               30 Images Containing 4 Different Symbols with
                        Corruptions.
face                    An Image of a Corrupted Face Image.
rnmf                    Robust Penalized Nonnegative Matrix
                        Factorization (rNMF).
see                     Visualize Vectorized Images
tumor                   An Image of 3 Simulated Tumors.
