The S4 class for NMF model results.
Slots
wfeature factor matrix
dscaling diagonal vector
hsample factor matrix
misclist containing optional components including tol (tolerance), iter (iterations), loss (final loss value), loss_type (loss function used), runtime (in seconds), w_init (initial w matrix), test_mask (CV test set), test_seed (CV seed), test_fraction (CV holdout fraction), train_loss (CV training loss), test_loss (CV test loss), and best_iter (CV best iteration)