this post was submitted on 29 Jan 2024
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Humans are neural networks... you can cite me on that.
(Notice I didn't say anything about the complexity, structure, or fundamental functioning of a human neural network. All points to modern artificial NNs being somewhat on a tangent to humans... but also that there is some overlap already, and that it can be increased)
Humans are a lot more than the mathematical abstraction that is a neural network.
You could say that you believe that any computational task that a human brain can accomplish, a neural network can also accomplish (simply assuming that all of the higher-level structures, different parts of the brain allocated to particular tasks, the way it encodes and interacts with memories and absorbs new skills, variety of chemical signals which communicate more than a simple number 0 through 1 being sent through each neuron-to-neuron connection, is abstractable within the mathematical construct of a neural network in some doable way). But that's (a) not at all obvious to me (b) not at all the same as simply asserting that we've got it all tackled now that we can do some great stuff with neural networks (c) not implying anything at all about how soon it'll happen (i.e. could take 5 years, or 500, although my feeling is probably on the shorter side as well).
Artificial NNs are simulations (not "abstractions") of animal, and human, neural networks... so, by definition, humans are not more than a neural network.
Not how it works.
Animal neurons respond as a clamping function, with a constant 0 output up to some threshold, where they start outputting neurotransmitters as a function of the input values. Artificial NNs have been able to simulate that for a while.
Still, for a long time it used to be thought that copying the human connectome and simulating it, would be required to start showing human-like behaviors.
Then, some big surprises came from a few realizations:
There are still a couple things to tackle:
The first one is kind of getting solved by attention heads and self-reflection, but I'd imagine adding extra layers that "surface" deeper states into shallower ones, might be a closer approach.
The second one... right now we have LoRAs, which are more like psychedelics or psychoactive drugs, working in a "bulk" kind of way... with surprisingly good results, but still.
Where it really will start getting solved, is with massive scale neuromorphic hardware accelerators the size of a 1TB microSD card (proof of concept is already here: https://www.science.org/doi/10.1126/science.ade3483 ), which could cut down training times by 10 orders of magnitude. Shoving those into a billion smartphones, then into some humanoid robots, is when the NN age will really get started.
Whether that's going to take more or less than 5 years, it's hard to say, but surely everyone is trying as hard as possible to make it less.
Then, imagine a "trainee" humanoid robot, with maybe 1000 accelerators of those, that once it trains a NN for whatever task, can be copied over to as many simple "worker" robots as needed. Imagine a company spending a few billion USD on training a wide range of those NNs, then offering a per-core subscription to other companies... at a fraction of the cost of similarly trained humans.
TL;DR: we haven't seen nothing yet.
Imma stop you right there
What's the neural net that implements storing and retrieving a specific memory within the neural net after being exposed to it once?
Remember, you said not more than a neural net -- anything you add to the neural net to make that happen shouldn't be needed, because humans can do it, and they're not more than a neural net.
Cyclic neural networks.
https://en.m.wikipedia.org/wiki/Recurrent_neural_network
Any other questions?
I think we're gonna have to agree to disagree as to the nature of neural net technology. I'm clearly not talking about optimizing handwriting recognition.
That's unfortunate, I wish we could agree on something instead. Anyway, let's leave it so, then. ✌️
We don't even know what consciousness or sentience is, or how the brain really works. Our hundreds of millions spent on trying to accurately simulate a rat's brain have not brought us much closer (Blue Brain), and there may yet be quantum effects in the brain that we are barely even beginning to recognise (https://phys.org/news/2022-10-brains-quantum.html).
I get that you are excited but it really does not help anyone to exaggerate the efficacy of the AI field today. You should read some of Brooks' enlightening writing like Elephants Don't Play Chess, or the airoplane analogy (https://rodneybrooks.com/an-analogy-for-the-state-of-ai/).
Where did I exaggerate anything?
We know more than you might realize. For instance, consciousness is the ∆ of separate brain areas; when they go all in sync, consciousness is lost. We see a similar behavior with NNs.
It's nice that you mentioned quantum effects, since the NN models all require a certain degree of randomness ("temperature") to return the best results.
There lies the problem. Current NNs have overcome the limitations of 1:1 accurate simulations by solving only for the relevant parts, then increasing the parameter counts to a point where they solve better than the original thing.
It's kind of a brute force approach, but the results speak for themselves.
I'm afraid the "state of the art" in 2020, was not the same as the "state of the art" in 2024. We have a new tool: LLMs. They are the glue needed to bring all the siloed AIs together, a radical change just like that from air flight to spaceflight.
The human brain is the most complex object in the known universe. We are only scratching the surface of it right now. Discussions of consciousness and sentience are more a domain of philosophy than anything else. The true innovations in AI will come from neurologists and biologists, not from computer scientists or mathematicians.
Quantum effects are not randomness. Emulating quantum effects is possible, they can be understood empirically, but it is very slow. If intelligence relies on quantum effects, then we will need to build whole new types of quantum computers to build AI.
Well, there we agree. In that the results are very limited I suppose that they do speak for themselves 😛
This is what I mean by exaggeration. I'm an AI proponent, I want to see the field succeed. But this is nothing like the leap forward some people seem to think it is. It's a neat trick with some interesting if limited applications. It is not an AI. This is no different than when Minsky believed that by the end of the 70s we would have "a machine with the general intelligence of an average human being", which is exactly the sort of over-promising that led to the AI field having a terrible reputation and all the funding drying up.