saturate when the generator is making a mistake so if you look at the very extreme left where the discriminator is outputting zeros where the discriminator is successfully rejecting the generator samples this cost function has a a high derivative value so the model is able to learn rapidly early on when it samples did not yet look realistic then if we move downward in the series of plots the blue curve the minimax curve is the one that we originally used to design this model framework and the one that's the easiest to analyze using the minimax