Comment by HarHarVeryFunny | Hacker News Reader

Comment by HarHarVeryFunny | Hacker News Reader

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HarHarVeryFunny

You regard the LLM post-training process as "giving it data" ?!

Have you looked at all the published JEPA research both while LeCun was at Meta, and since (up to and including the latest AdaJEPA from June)? Please enlighten us as to exactly which line(s) of research you think were "scaled" at Meta, and then tell us which of these constituted anything even remotely resembling a complete testable intelligence?

FYI, it's been a long time since FaceBook/Meta even had a single head of AI. Since 2018 it has been split into two groups, FAIR and Generative AI, with LeCun being in the FAIR group, not as head, but as Chief AI scientist. LeCun only invented JEPA in 2022 (shortly after FaceBook became Meta), first writing about it in his "A Path Towards Autonomous Machine Intelligence" paper, perhaps unhappy with the work of the GenAI group, which he had no control over, that presumably was getting all the compute.

https://openreview.net/pdf?id=BZ5a1r-kVsf

> What are you talking about?

I was referring to Uszkoreit's personal telling (on YouTube) of the origin story of the Transformer, his motivations with the design, his initial personal failure to implement his idea in a performant enough manner to beat the current LSTM SOTA, and Noam Shazeer then throwing the kitchen sink at it and eventually coming up with the Transformer design.

>You regard the LLM post-training process as "giving it data" ?!

Yeah. Presumably, lots of synthetic data is being generated, experiments being run, but post-training is still a largely automated process.

>Have you looked at all the published JEPA research both while LeCun was at Meta, and since (up to and including the latest AdaJEPA from June)? Please enlighten us as to exactly which line(s) of research you think were "scaled" at Meta, and then tell us which of these constituted anything even remotely resembling a complete testable intelligence?

I have. My point isn't that his ideas are trash or that he should stop working on them. My point is it's not "gone very far" because he's taking it as far as he can, which isn't very far. He's not had a lack of influence, resources or will, either from his time at Meta or now with his billion dollar startup. He's had far more of it than most, if anything. That there's not much to show for it so far is not for a lack of trying.

>I was referring to Uszkoreit's personal telling (on YouTube) of the origin story of the Transformer, his motivations with the design, his initial personal failure to implement his idea in a performant enough manner to beat the current LSTM SOTA, and Noam Shazeer then throwing the kitchen sink at it and eventually coming up with the Transformer design.

So it's what I thought. This is just regular research unless an inordinate amount of time was spent on it and that's not the case.

> My point is it's not "gone very far" because he's taking it as far as he can, which isn't very far.

I wouldn't really agree - I'm no fan of LeCun, but the problem with JEPA isn't that it's a bad idea, or can't go very far, but just that it's not much of an idea in the first place!

It's no secret that our brain basically works by prediction, and what we're predicting is necessarily the external world as we perceive it though our own senses, aka latent representations, aka JEPA.

So, you COULD take this unoriginal smidgen of an idea and built it out to a full model of a human/animal brain, whether or not it's LeCun's intention to do so (he seems more interested in just the representational / world model aspect to it), but he certainly hasn't done so yet, nor created any research manifesto indicating that as his intent.

The fact that JEPA implementations to date are using pre-trained Transformers doesn't seem inherent to the approach - one could, with more effort, still predict latent representations (i.e. sensory feedback) but do so using a new real-time learning algorithm based on prediction failure.

LeCun seems more of an academic / research director than a builder, and I would never have put much stock in him being the one to build an animal brain.

Well I also don't think JEPA is a bad idea or anything. I don't think most of the alternative architectures or tweaks i've seen are bad ideas. On the contrary, some of them seem very cool and i'm all for interesting new ideas. I guess my opinion is more on the supposed necessity of it all.

I think the transformer is a powerful general learner. I think it's enough, and on the matter of intelligence, sometimes i think we make the mistake of zoning in too much on potentially spurious details. We still don't know much about Intelligence at the end of the day, what is and isn't really important, what is and isn't simply a detail of the environment and what kind of seemingly bizarre but surprisingly equivalent mechanisms can arise in the face of vastly different environments.

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