Screencap of tweet from Ethan Mollick reading: "We are running out of a vital resource: words! There are “only” 5 to 10 trillion high-quality words (papers, books, code) on the internet. Our AI models will have used all of that for training by 2026. Low-quality data (tweets, fanfic) will last to 2040. https://arxiv.org/pdf/2211.04325.pdf" And including screencaps of Table IV and the whole first page of the linked paper.
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