The file should be in csv format. Example:
# X1,X2,y
-2.100552557727890957e+00,-6.128650159277657106e-02,0
-1.159019414554130156e+00,5.913233466995695409e-01,0
2.390116885110828981e-01,-2.151085116975746558e+00,0
-1.685507377135475160e+00,2.318535329405873868e-01,0
1.665344297477713287e-01,-4.572513228039341571e-01,1
-1.167678798682300290e+00,5.999644077804777709e-01,1
5.400378568542962832e-01,1.761797786765964546e-01,1
-1.721382016840375950e+00,8.207273112628025169e-01,1
Note:
1. Use comma delimiter. 2. Each column is a feature Xi. The last column is y.