fraction_variance_explained
                        Fraction of variance explained
fraction_variance_explained_perPC
                        Fraction of variance explained per PC
mspca                   Multiple Sparse PCA
orthogonality_violation
                        Orthogonality constraint violation
pairwise_correlation    Pairwise correlation
print_mspca             Print mspca output
tpw                     Truncated Power Method
variance_explained_perPC
                        Variance explained per PC
