Paper authors: Erik Jenner, Shreyas Kapur, Vasil Georgiev, Cameron Allen, Scott Emmons, Stuart Russell

TL;DR: We released a paper with IMO clear evidence of learned look-ahead in a chess-playing network (i.e., the network considers future moves to decide on its current one). This post shows some of our results, and then I describe the original motivation for the project and reflect on how it went. I think the results are interesting from a scientific and perhaps an interpretability perspective, but only mildly useful for AI safety.

Teaser for the results

(This section is copied from our project website. You may want to read it there for animations and interactive elements, then come back here for my reflections.)

Do neural networks learn to implement algorithms involving look-ahead or search in the wild? Or do they only ever learn simple heuristics? We investigate this question for Leela Chess Zero, arguably the [...]

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Outline:

(00:41) Teaser for the results

(01:20) Setup

(02:18) Activations associated with future moves are crucial

(04:35) Probes can predict future moves

(05:28) More results

(06:19) The origins of this project

(09:05) Theories of change

(10:05) How it went

(12:13) Sidenote: look-ahead vs search

(13:29) Takeaways for interpretability

(13:51) Creating an input distribution using a weaker model

(16:23) We relied on established mech interp tools more than expected

(17:08) Probing for complex things is difficult

(17:57) There are many more angles of attack than time to pursue them all

(19:27) Good infrastructure is extremely helpful

(20:13) Relevance to AI safety

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First published:
June 4th, 2024

Source:
https://www.lesswrong.com/posts/GfwdBoaLw3ef3zBqe/evidence-of-learned-look-ahead-in-a-chess-playing-neural

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Narrated by TYPE III AUDIO.

“Evidence of Learned Look-Ahead in a Chess-Playing Neural Network” by Erik Jenner

LessWrong (30+ Karma)

“Evidence of Learned Look-Ahead in a Chess-Playing Neural Network” by Erik Jenner