(I apologize again for all these questions. This week was particularly confusing for me.)
I know this is explained in the video, but I don’t understand the explanation.

Is the feature space just the set of all the variables? If so, why would it be impossible or impractical to check all of the critic’s gradients, when we’re able to calculate them earlier?

How exactly does an interpolation help? Wouldn’t the amount of variables, and therefore the amount of gradients to check still be the same?