zero with some probability so I'd say our probability is 0.5 we're randomly going to set the activations to 0.5 with probability of 0.5 to some of our hidden neurons to 0 the idea is extremely powerful because it allows the network to lower its capacity it also makes it such that the network can't build these memorization channels through the network where it tries to just remember the data because on every iteration 50% of that data is going to be or 50% of that memorization or memory is going to be wiped out so it's going to be forced to to not only generalize