The butterfly factorization function has been updated to allow using one or several permutations. This update makes the function fully match the reference paper [1] and is available for both pyfaust and matfaust.
In addition to the permutation functionality of the butterfly factorization, a new function named rand_butterfly has also been integrated in the wrappers (pyfaust, matfaust). This function allows to randomly generate a Faust according to butterfly supports. It brings a simple way to test the butterfly factorization using the full array of those random butterfly Fausts.
[1] Quoc-Tung Le, Léon Zheng, Elisa Riccietti, Rémi Gribonval. Fast learning of fast transforms, with guarantees. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing, May 2022, Singapore, Singapore. (hal-03438881)
