and the gradient tells me how if the reward is low on the other hand i want to make less of what i just did but also the gradient tells me how that can be achieved i simply go into the other direction than i would if the reward is high in evolutionary methods we don't have we don't do this gradient calculation okay now there can be advantages to not doing radian calculation sometimes back propagation simply isn't possible even if it is possible and this is maybe the case where we are now what we need to learn in our case is