What is a convex model?

Question

I know what is a convex function. Wikipedia says:

In mathematics, a real-valued function f(x) defined on an interval is called convex (or convex downward or concave upward) if the line segment between any two points on the graph of the function lies above the graph, in a Euclidean space (or more generally a vector space) of at least two dimensions.

But what is a convex model?

Answer 1

If you have a model that states that something is described by the solution of a convex optimization problem, then that's a convex model.