Putting constraint on neural network's output in Rapidminer
I am developing a simple neural network model in Rapidminer to predict the number of cars passing on a highway every hour. As it is obvious, in the early morning (from 2:00 am to 6:00 am) few cars are on the highway and sometime my model predicts the number of cars to be negative (like -2 or -3), which is understandable statistically but is not cool when you want to report it somewhere.
I am looking for a way to put constraint on the model so that it would only predict positive numbers. How can I do that?