The oracle in this case is a piece of software that compares the neural net's outputs with pre-classified data. A test oracle "magically" knows the truth, from

The oracle in this case is a piece of software that compares the neural net's outputs with pre-classified data. A test oracle "magically" knows the truth, from the perspective of the system, is the idea. Sometimes oracles don't even exist but can be useful as a conceptual tool in deriving some other finding -- such as a proof by contradiction.