Well, OK, there are gains in efficiency, but the context here is, as far as I understand it, letting an "AI" train a better "AI". Perhaps I misunderstand the O

Well, OK, there are gains in efficiency, but the context here is, as far as I understand it, letting an "AI" train a better "AI". Perhaps I misunderstand the OP and like I say in my comment above, I've seen comments to that extent pop up here and there om HN in the last few days, so maybe I'm jumping to conclusions about what the OP meant. I should have asked for clarifications (although usually when I do there's no response; not from the OP, from most users).