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LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

dnhkng.github.io

11–20 of 44 posts

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#11
I wonder if there is a path where a model can be trained for variable reasoning layer reuse and determine at a token level how many times to traverse the reasoning blocks. Much like adjustable reasoning levels now, but only repeating thinking circuits instead of running through full output reasoning chains.

While the author mentioned multiple passes through the block didn't help in this instance, I can't help but wonder if it would work if it were built in during training.

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#12
it sometimes makes me think of a video at some point of a guy (Daniel Tammet) who had some brain difference,which caused him to be extremely fast at language learning. He said all language carries the same patterns for him, which he sees through synestesia or whatever.

he learnt icelandic in week and had a fluent conversation on their national TV to prove it. (this is nuts, that language is extremely difficult to pickup with nasal sounds etc.)

ofcourse i guess its not even close to average to have such a abilities as a human, but i wonder if at some point LLMs and AI algorithms and models might shed light on such kind of abstractions (like some mentioned in comments also about image recognition algos) that might help humans actually learn these things themselves, train on them and perhaps even get taught such a thing as a skill.

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#13
post #10

Apologies if I missed this in the article (or in the first article in the series) - what happens if you add two copies of the layer set? Does performance improve over adding one copy of the layer set?

Author here: That was done in this blog post, in the beam search. I started with the best re-layer configs, and iteratively added more blocks, including the same multiple times, during a long beam search.

It turns out this does not help (somewhat surprisingly).

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#14
post #7

How's the reproducibility of the results? Like avg score of 10 runs vs original.

Author here: The code is up on GitHub.

The probes I used seem to help identify good configurations, but are quite noisey. A small probe set was initially used to make the scan tractable, and then the higher ranked models were retested on a set ~10x larger.

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#15
post #13
post #10

Apologies if I missed this in the article (or in the first article in the series) - what happens if you add two copies of the layer set? Does performance improve over adding one copy of the layer set?

Author here: That was done in this blog post, in the beam search. I started with the best re-layer configs, and iteratively added more blocks, including the same multiple times, during a long beam search. It turns out this does not help (somewhat surprisingly).

Actually not surprised. I guess this is for the same reason “say it twice” [1] is working. Because LLm are trained as causal language model, past token cannot attend to future token. One copy of the layer set solve this. [1]https://arxiv.org/html/2512.14982v1

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#17
This was a little dense for me to grok. Are these well known results or is there an abstract-like summary?

The RYS (repeat yourself) hypothesis that duplicating (the right) layers is enough to improve performance (sorry for not reading closely enough, it's really just stacking the relevant layers?).

The ERD (encoding, reasoning, decoding) layer structure is a relatively robust observation? That the middle layers of the NN will reason in universal space, and this is kinda evidenced by cosine similarities of the hidden states at each layer given similar or dissimilar inputs. And that similar inputs converges by layer 5 and you can kinda watch that happen in the cosine similarities?

This post is incredible and I'm afraid it'll drop off the front page before people engage deeply with it. (The methodology was interesting, maybe there's other big ideas I'm missing.)

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#18

This was a little dense for me to grok. Are these well known results or is there an abstract-like summary? The RYS (repeat yourself) hypothesis that duplicating (the right) layers is enough to improve performance (sorry for not reading closely enough, it's really just stacking the relevant layers?). The ERD (encoding, reasoning, decoding) layer structure is a relatively robust observation? That the middle layers of t…

Perhaps not widely known but certainly known in LLM research. There was a bunch of these experiments done 2 years ago and what's interesting is that it still seems to work on the latest models.

Though beware that the increased score on math and EQ could lead to other areas scoring less well; would love to see how these models score on all open benchmarks.

Re: LLM Neuroanatomy II: Modern LLM Hacking and Hints of a Universal Language?

#20
post #6

We've discovered the language. It changes the economics of computing. As in, this entire cloud buildout is unnecessary because it becomes like using a calculator. Reach out to chat.

Would you be willing to elaborate? I would be curious to hear more.

shoot me an email and lets jump on a call. I'll blow your mind.
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