want to classify new data points using a small data set D so classifying new data points means your test data point X test goes in your label Y test comes out and this function that does this is somehow parameterize by theta star so theta star determines the mapping between X test and y test Waiters theta star come from well it comes from using your data set D which might be a small data set for your new task together with your theta star so D is going to be read in by some function and that function that reads in