WGAN gradient penalty mathematical notation

WGAN gradient penalty is a recurring research-paper notation family. Penalizes critic input-gradient norms that depart from one on interpolated samples to encourage a Lipschitz constraint.

WGAN gradient penalty: Penalizes critic input-gradient norms that depart from one on interpolated samples to encourage a Lipschitz constraint. Example: Charge the critic when its local slope is too large or too small.