PRACTICE MAKES PERFECT. OpenAI Five trained first as individual algorithms in one-vs-one matches and then as a team by playing against itself and past versions of itself. As a team, it collected 180 years worth of experience during each day of training, eventually picking up on strategies typically used by professional Dota 2 players. None of the algorithms could communicate with one another — cooperation was simply one of each algorithm's incentives. This cooperation continued when a human player replaced one of the algorithms.
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