Speed up image.tomography.get_next_power() #3168
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By the way I wonder if |
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The module
silx.image.tomographyuses a functionget_next_power()which, given an integern, finds the next "friendly" power of(2, 3, 5 ,7). This is used for padding data before performing FFT.The current implementation builds a sorted list of numbers in the form
(2**a)*(3**b)*(5**c)*(7**d), and finds the "next friendly power" by bisection.Building this list takes some time, which can be noticeable if
get_next_power()is needed many times. In this PR, the list of powers is cached in a LRU structure.