Communal Overfitting
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State
A grade is spent once used for tuning — and thousands of teams tuning against the same leaderboard spend it communally, overfitting the exam with no individual cheating.
Show
Unit 8's re-tuning sin, committed by a civilization: each team honest, the ensemble bent around the target.
Watch for
The leaderboard's job was discrimination; making it the target ends the job.