quantity in order to retrieve the pattern that you want okay now we are never directly working with the energy as such uh so what you could do is for example use back prop or something to use gradient descent to decrease the energy but usually along with an energy function comes an update function and the update function is what i've talked about here like you do something and then the network does something and then you get the pattern out what the network does is it minimizes its energy function and the update rule