notebooks/dbm_cifar.ipynb

@SrMouraSilva @jordanbCS @hannesdm @yell 
Hi!I'm sorry to bother you again!
I look at the repo,but I got confused!I hope you could make a explainationfor that in detai!
And how were  X_aug_mean.npy and X_aug_std.npy generated in notebooks folder?
Looking forward to your reply!