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A short note on a point that I'd been confused about until recently. Suppose you have a deceptively aligned policy which is behaving in aligned ways during training so that it will be able to better achieve a misaligned internally-represented goal during deployment. The misaligned goal causes the aligned behavior, but so would a wide range of other goals (either misaligned or aligned) - and so weight-based regularization would modify the internally-represented goal as training continues. For example, if the misaligned goal were "make as many paperclips as possible", but the goal "make as many staples as possible" could be represented more simply in the weights, then the weights should slowly drift from the former to the latter throughout training.
But actually, it'd likely be even simpler to get rid of the underlying misaligned goal, and just have alignment with the outer reward function as the terminal goal. So this argument suggests that even policies which start off misaligned would plausibly become aligned if they had to act deceptively aligned for long enough. (This sometimes happens in humans too, btw.)
Reasons this argument might not be relevant: - The policy doing some kind of gradient hacking - The policy being implemented using some kind of modular architecture (which may explain why this phenomenon isn't very robust in humans)
Misaligned goal --> I should get high reward --> Behavior aligned with reward function
The shortest description of this thought doesn't include "I should get high reward" because that's already implied by having a misaligned goal and planning with it.
In contrast, having only the goal "I should get high reward" may add description length like Johannes said. If so, the misaligned goal could well be equally simple or simpler than the high reward goal.
I think you don't have to reason like that to avoid getting changed by SGD. Suppose I'm being updated by PPO, with reinforcement events around navigating to see dogs. To preserve my current shards, I don't need to seek out a huge number of dogs proactively, but rather I just need to at least behave in conformance with the advantage function implied by my value head, which probably means "treading water" and seeing dogs sometimes in situations similar to historical dog-seeing events.
Maybe this is compatible with what you had in mind! It's just not something that I think of as "high reward."
And maybe there's some self-fulfilling prophecy where we trust models which get high reward, and therefore they want to get high reward to earn our trust... but that feels quite contingent to me.
2Richard_Ngo
I think this depends sensitively on whether the "actor" and the "critic" in fact have the same goals, and I feel pretty confused about how to reason about this. For example, in some cases they could be two separate models, in which case the critic will most likely accurately estimate that "treading water" is in fact a negative-advantage action (unless there's some sort of acausal coordination going on). Or they could be two copies of the same model, in which case the critic's responses will depend on whether its goals are indexical or not (if they are, they're different from the actor's goals; if not, they're the same) and how easily it can coordinate with the actor. Or it could be two heads which share activations, in which case we can plausibly just think of the critic and the actor as two types of outcomes taken by a single coherent agent - but then the critic doesn't need to produce a value function that's consistent with historical events, because an actor and a critic that are working together could gradient hack into all sorts of weird equilibria.