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385 points vessenes | 4 comments | | HN request time: 0.636s | source

So, Lecun has been quite public saying that he believes LLMs will never fix hallucinations because, essentially, the token choice method at each step leads to runaway errors -- these can't be damped mathematically.

In exchange, he offers the idea that we should have something that is an 'energy minimization' architecture; as I understand it, this would have a concept of the 'energy' of an entire response, and training would try and minimize that.

Which is to say, I don't fully understand this. That said, I'm curious to hear what ML researchers think about Lecun's take, and if there's any engineering done around it. I can't find much after the release of ijepa from his group.

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inimino ◴[] No.43367126[source]
I have a paper coming up that I modestly hope will clarify some of this.

The short answer should be that it's obvious LLM training and inference are both ridiculously inefficient and biologically implausible, and therefore there has to be some big optimization wins still on the table.

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jedberg ◴[] No.43367169[source]
> and biologically implausible

I really like this approach. Showing that we must be doing it wrong because our brains are more efficient and we aren't doing it like our brains.

Is this a common thing in ML papers or something you came up with?

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1. _3u10 ◴[] No.43367478[source]
Nah it’s just physics, it’s like wheels being more efficient than legs.

We know there is a more efficient solution (human brain) but we don’t know how to make it.

So it stands to reason that we can make more efficient LLMs, just like a CPU can add numbers more efficiently than humans.

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2. jonplackett ◴[] No.43368078[source]
Wheels is an interesting analogy. Wheels are more efficient now that we have roads. But there could never have been evolutionary pressure to make them before there were roads. Wheels are also a lot easier to get to work than robotic legs and so long as there’s a road do a lot more than robotic legs.
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3. ◴[] No.43378048[source]
4. _3u10 ◴[] No.43378070[source]
People think the first wheel was invented for making pottery. Biological machinery for the most part has to be self-reproducing so there is a lot of limitations on design, also it has to be able to evolve, so you get inefficient solutions like the vargas nerve (i think that's its name), basically there's a really long nerve in your body that takes a route under your trachea and then back up to another part of your brain, in giraffes its something like 40 feet long to go a few inches shortest path.

Wheels other than rolling would likely never evolve naturally because there's no real incremental path from legs to wheels, where as flippers can evolve from webbed fingers incrementally getting better for moving in water.

I dunno, maybe there's an evolutionary path for wheels, but i don't think so.