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Those images are not really "labeled". They just scraped the alt text. A lot of the recent advances in AI have been by using lower quality large scale web data, instead of hand labeling. The noise will average out. Hand labeled data can be used for finetuning.

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This is the same thinking that leads to incredible astrophotography using stacked long exposure images that appear to be pure noise individually.

Not really. There's sound theoretical basis for that approach in astrophotography. The sort of bias and or noise introduced by systemically poor labeling is much less reliably averaged out.

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