Recipe of Deep Learning YES Step 1:define a NO set of function Good Results on Testing Data? Overfitting！ Step 2:goodness of function YES NO Step 3:pick the Good Results on best function Training Data? Neural Network 8Neural Network Good Results on Testing Data? Good Results on Training Data? Step 3: pick the best function Step 2: goodness of function Step 1: define a set of function YES YES NO NO Overfitting! Recipe of Deep Learning