load digit_x.dat;
load digit_y.dat; 
[n,m] = size(digit_x);

digit_y = 2*digit_y-1;
digit_x = (2*digit_x-1)/sqrt(m);

load digit_x_test.dat;
load digit_y_test.dat; 

digit_y_test = 2*digit_y_test-1;
digit_x_test = (2*digit_x_test-1)/sqrt(m);

