4 ms·

never thought of this.

• linkingday 8y ago
  But how does Captcha know that your answers are correct? There's likely already a predictive model that knows (within some confidence intervals) which ones are the 'correct' answers - someone had to label that data to begin with! Chicken, meet egg.
  • joncrane 8y ago
    They display the same pictures to multiple people and have some kind of agreement algorithm.