> And then .. a neural net beats us at all board games, another can solve differential equations, another can translate, another can see, and so on. Have we really not learned anything by these inventions?
I would still argue no, we haven't learned anything about intelligence from these. They are impressive achievements, but strictly in the sense of "We found a way to use computers in a way we were not using them before".
1.) Neural nets + MCTS beat us at all board games--board games that humans invented and can achieve mastery at. If a human Go player was born who could beat that version of AlphaZero, we would not say that person has solved intelligence.
2.) Differential equations: also invented/discovered by humans, can also be solved by humans
3.) Translate and see: See above, with the additional caveat that humans actually are better at translating and seeing than deep learning systems are.
In addition, these were all achieved individually by systems with different architectures and massive amounts of training data that would amount to several human lifetimes. An 18 year-old human can play board games, drive a car, do differential equations, and learn multiple languages, with a single brain using a generalized structure and a fraction of the "training data" afforded to DL. This indicates to me that ML as a whole is still very far off the mark of General Intelligence.
> Previously you might wonder how emotion, thought, sensation, imagination and will relate to each other. Now we can understand how they might be implemented and wired together, and what principles support their function.
Previously? This is still an unanswered question. Show me where deep learning research has even come close to producing a system that can learn and adapt like a human mind does.