You can still brute force it, which is more or less how back propagation works.
Intractable problems of that scale can’t be brute forced because the brute force solution can’t be run within the time scale of the universe, using the resources of the universe. If we’re talking about maintaining all the computing power of humanity towards a solution and hoping to solve it before the sun expands to cover the earth in about 7.5 billion years, then it’s not a real solution.
Intractable problems of that scale can’t be brute forced because the brute force solution can’t be run within the time scale of the universe, using the resources of the universe. If we’re talking about maintaining all the computing power of humanity towards a solution and hoping to solve it before the sun expands to cover the earth in about 7.5 billion years, then it’s not a real solution.