Welcome to the 10th part of our of our machine learning regression tutorial within our Machine Learning with Python tutorial series. We’ve just recently finished creating a working linear regression model, and now we’re curious what is next. Right now, we can easily look at the data, and decide how “accurate” the regression line is to some degree. What happens, however, when your linear regression model is applied within 20 hierarchical layers in a neural network? Not only this, but your model works in steps, or windows, of say 100 data points at a time, within a dataset of 5 million datapoints. You’re going to need some sort of automated way of discovering how good your best fit line actually is.