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I think the ChatGPT scraping is still unverified afaik. They might've used it to build the RL training data I guess.
In this blog that gets a lot more technical they note that the optimizations they made were obviously good targets for optimization in retrospect:
None of these improvements seem like they were found as a result of some brute-force search through possible ideas. Instead, they look like they were carefully devised by researchers who understood how a Transformer works and how its various architectural deficiencies can be addressed.
Fascinating
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