Rishi Dua
40 linhas
891 B
Matlab
40 linhas
891 B
Matlab
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%% DESCRIPTION
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clc;
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clear all;
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% Transforms features into Recht and Rahimi’s Random Fourier Feature as defined in:
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% Rahimi, Ali, and Benjamin Recht. "Random features for large-scale kernel machines." In Advances in neural information processing systems, pp. 1177-1184. 2007.
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X = dlmread('data/features_raw.dat', ' ');
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n_features = size(X,2);
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n_data = size(X,1);
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gamma_inv = 0.1;
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gamma = 1/gamma_inv;
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sigma = sqrt(2/gamma_inv);
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n_randomfeatures = 5040;
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%calculate
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W=normrnd(0,sigma,n_features,n_randomfeatures);
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b=2*pi*rand(1,n_randomfeatures);
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B = ones(n_data,1)*(b);
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X_rrt = sqrt(2/n_randomfeatures)*cos(X*W+B);
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disp('calculated');
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%normalize
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%mean_tr = mean(Data_new);
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%std_tr = std(Data_new);
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%Data_new = (Data_new-repmat(mean_tr,n_data,1))./(repmat(std_tr,n_data,1));
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%disp('normalized');
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%toc;
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%write
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dlmwrite('data/features_rrt.dat',X_rrt, ' ');
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disp('writen to file');
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