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A comment on How Cheap Labor Drives China’s A.I. Ambitions. Parent comment

Re:How Cheap Labor Drives China’s A.I. Ambitions by oh-kumudo on Monday November 26, 2018 @03:40PM (#18536612)
For Captcha, you are pointing out the one or several pictures that doesn't belong to certain category, so that seems to me the service needs to know the answer beforehand, doesn't it? It could be used for QA purpose though.
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Re:How Cheap Labor Drives China’s A.I. Ambitions by agnokapathetic on Monday November 26, 2018 @04:24PM (#18536922)
Don't need ground truth for crowd-sourced annotation just need agreement between n-different users.

1 randomly present captcha to few known-safe/low risk users 2. Compare answers with answers from higher risk user's Captcha responses.

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Re:How Cheap Labor Drives China’s A.I. Ambitions by iforgotpassword on Monday November 26, 2018 @04:40PM (#18537056)
Back when the captchas just showed two words, one of them was already verified while the other was not. So if you got the former wrong you failed, but for the other one you could type anything you wanted. The modern ones most likely work in a similar way.
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