videos the compiled command tells tensorflow how to update the relationships in the dense connections when we're doing the training with our data we have a measure of loss or inaccuracy we want to minimize we specify as categorical cross entropy in case you are familiar with the law gloss this is another term for the same thing we use an algorithm called stochastic gradient descent to minimize the categorical cross entropy loss function again we'll cover this in our Theory video we asked it to report the accuracy metric that is what fraction of