Bregman divergence

Bregman divergence is a way of measuring how different two things are - like how different two pictures of the same thing, or two different types of food, might be from each other. It's like a comparison tool that tells you how different two things are. To figure out the amount of difference, Bregman divergence looks at a "distance" or "divergence" between the two items being compared. The bigger the divergence, the more different the two things are from each other.