In this banal set of metaphors it would have to be something else. There may arguably be some mysteries with respect to how deep learning is effective, but its

In this banal set of metaphors it would have to be something else. There may arguably be some mysteries with respect to how deep learning is effective, but its precise mechanistic explanation as a series of operations on a processor is not mysterious. There is not presently a quantum theory of gravity (in fact, I'd argue that despite the practical successes of QFT there isn't really a theory of quantum mechanics _either_ in the sense that algebraic quantum field theories of non-trivial character are so far elusive and no one knows what quantum field theory at large actually is or why it works, but I digress). In the current account of the world there is literally know way for us to understand how gravity arises from the rules we presently believe must be true based on our successes with the other theories.