That's a rather weird use of the term “oracle”, which normally means “a black box that solves a decision problem in a single step”. Normally, to decide whether

That's a rather weird use of the term “oracle”, which normally means “a black box that solves a decision problem in a single step”. Normally, to decide whether you've achieved your goals, you don't use a black box - you use performance metrics that you've defined yourself (and thus can't claim not to understand).