it got from the teacher so this is a setting of a neural network that have been studied in physics for 30 years kind of the most common example would be this teacher student perceptron where the nonlinearity that the teacher is using is just a sign but with just a sign and no constraints on the weights w this becomes a convex optimization problem so today we are interested in intrinsically non-convex optimization problems so in order to make it more interesting and intrinsically non-convex we will actually be looking today at the face