like one factor I can put my finger on it say this is why ganz worked for photo generation and deep Boltzmann machines don't there are a lot of theory papers showing that under some theoretical settings the the gun algorithm does actually converge but those settings are restricted enough that they don't necessarily explain the whole picture in terms of all the results that we see in practice so taking a step back can you in the same way as we talked about deep learning can you tell me what generative adversarial