Apply preprocessing to new data for projection using a Nyström approximation.
This method overrides the default reprocess.projector to handle the fact that
Nyström components are in kernel space (not feature space).
# S3 method for nystrom_approx
reprocess(x, new_data, colind = NULL, ...)Preprocessed data matrix
A nystrom_approx object
A matrix with the same number of columns as the original training data
Optional column indices (not typically used for Nyström)
Additional arguments (ignored)