Figure 6.

The architecture of a BiGAN. Using this technique, both ($z$ and $E\left(x\right))$ and ($G\left(z\right)$ and $x$) have the same dimensions. The concatenated pairs $\left[G\left(z\right), z\right]$ and $\left[x, E\left(x\right)\right]$ are the two inputs of the discriminator $D$. Both the generator $G$ and encoder $E$ are optimized using the loss created by the discriminator $D$.