D is parametrized by theta star sorry about that so that function is parametrized by theta star now you would also like to of course be able to learn this theta star using large amounts of metal training data which I'll come to in a second but if you can somehow use that Mediterranea to get theta star then that will process your data set up with Phi star and allow you to turn your test inputs into test labels so theta star is what parametrize is this function okay so now how do we actually train this thing well as I alluded to before it's