predictions for all the missing values and then retrain the whole thing on the predictive values with the others in practice I never had a great deal of success with that technique but there is some theoretical basis for it with semi supervised training and Ganz will see that there's a way that we are able to actually make use of these now semi-supervised training this does make sense from a biological standpoint if you think about a child who is seeing all sorts of vehicles as they go about their daily lives with their parents or