training sample so this is obviously some structure in our world here you know all the values of y1 y2 seem to rely on some sort of surface line I mean your curve and if I give you a value of y2 you can predict that the value of y1 will be sort of around here or around there this is this is 30 okay I couldn't tell it was like a comma or not ok 30 minute that's perfect so right so there are multiple possible predictions so if you train a neural net or whatever primary trace function to make one prediction of y2 of y1 as a