“Physics is very verifiable. It's a great reward function, fairly fast iteration loop. You have simulators for large classes of physical systems.”
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More from Liam Fedus
Insight
Fedus: Pre-training on domain data outperforms retrieval-augmented generation
“However, as we've seen with things like ChatGPT and other things, when you pre-train on the data, when you actually encode the knowledge into the weights, it's not just a retrieval system, you have a richer, deeper understanding of the material.”
Liam FedusSep 30, 2025▶ 39:20Building an AI Physicist: ChatGPT Co-Creator’s Next Venture
AssertionNot checkable as stated
Fedus: Physics and chemistry demonstrate scaling laws similar to AI
“On the material science side, we're seeing scaling laws within physics, within chemistry both with respect to simulations, with respect to experiment, and it's like the same kind of principles at play and ML.”
Liam FedusSep 30, 2025▶ 3:02Building an AI Physicist: ChatGPT Co-Creator’s Next Venture
Disclosure
Fedus: Periodic Labs uses physical experiments as RL reward functions
“And what we're doing, and by having the lab, is we create a physically grounded reward function. That becomes the basis on which we're optimizing against. And so, If a simulator has some deficiencies or some issues, we always error correct, because for us, the…”
Liam FedusSep 30, 2025▶ 5:01Building an AI Physicist: ChatGPT Co-Creator’s Next Venture
Disclosure
Fedus: Early ChatGPT was mathematically weak due to friendliness rewards
“The reward functions that we were using originally couldn't determine whether you were mathematically correct or not. So early versions of Chachapiti were mathematically not particularly strong, and it sort of results from the reward function. What did you opt…”
Liam FedusSep 30, 2025▶ 7:02Building an AI Physicist: ChatGPT Co-Creator’s Next Venture
Insight
Fedus: AI physics requires generating new experimental data, not web scrapes
“The technology that we think is necessary to do it has really just emerged in the last couple of years, and this data Isn't like on a Reddit forum or something like you need to actually go produce experimental data, simulation data.”
Liam FedusSep 30, 2025▶ 16:08Building an AI Physicist: ChatGPT Co-Creator’s Next Venture
Insight
Fedus: AI science requires real-world experimental feedback loops
“Ultimately science is driven against experiment in the real world. And so that's what we're doing with periodic labs. We're taking these precursor technologies and we're saying, okay, if you care about advancing science, we need to have experiment in the loop.”
Liam FedusSep 30, 2025▶ 7:46Building an AI Physicist: ChatGPT Co-Creator’s Next Venture
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