Date: 2025-06-25 22:28:03
Score: 4
Natty:
You can just apply a fixed random pattern of sign flips to the input data and then do a fast Walsh Hadamard transform.
Repeat that again for sparse input data.
https://sites.google.com/view/algorithmshortcuts/home
Code:
https://archive.org/details/software?tab=collection&query=mini+java+collection&and%5B%5D=year%3A%5B2025+TO+2025%5D
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