randomize permutates independently the entries in
each column of a matrix-like object, to produce random
data that can be used in permutation tests or bootstrap
data to be permutated. It must be an object
suitable to be passed to the function
extra arguments passed to the function
In the context of NMF, it may be used to generate random data, whose factorization serves as a reference for selecting a factorization rank, that does not overfit the data.
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