train it and we have to teach it how to perform this task until we teach it it's just like a baby that doesn't know anything so it just entered the world it has no concepts or no idea of how to solve this task and we have to teach at that now how do we do that the idea here is that first we have to tell the network when it's wrong so we have to quantify what's called its loss or its error and to do that we actually just take our prediction or what the network predicts and we compare it to what the true answer was