Fill in the blank. A $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ has two convolutional neural networks $($CNNs$)$ that battle each other. One CNN$,$ the generator, works towards creating output that is good enough to fool the other CNN$,$ called the discriminator.

heads up guidance system $($HGS$)$

vocal recognition network $($VRN$)$

natural language processing $($NLP$)$ system

generative adversarial network $($GAN$)$