This function provides an implementation of the Fastfood kernel expansions . We provide two verisons of Walsh-Hadamard transform in Fastfood. One is the Matlab built-in function fwht, the other is based on Spiral WHT package.
 Q. Le, T. Sarlos, and A. Smola. Fastfood - Approximating Kernel Expansions in Loglinear Time. ICML, 2013.
Ji Zhao (2022). Fastfood kernel expansions (https://www.mathworks.com/matlabcentral/fileexchange/49142-fastfood-kernel-expansions), MATLAB Central File Exchange. Retrieved .
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