Intelligence must inherently be a function unless there is a third form of cause-effect transition that can't be modelled as a function of determinism and randomness.
Functions are by definition not random. Randomness would break: "In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y"
"Function" has (at least) two meanings. The last clause is not talking about functions in the mathematical sense. It could have been worded clearer, sure.
