Well, I don't know how they did it, but you could easily imagine a scenario: - 3 human raters, one computer rater - computer always agrees with 2/3 humans -

Well, I don't know how they did it, but you could easily imagine a scenario: - 3 human raters, one computer rater - computer always agrees with 2/3 humans - humans do not always agree with 2/3 humans