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为什么明明很准,奖励模型就是不work?新研究:准确度 is not all you need
在这篇论文中,他们证明:无论奖励模型有多准确,如果它会导致奖励方差较低,那么 RLHF 目标优化起来就会比较缓慢。即使是完全准确的奖励模型也会导致优化速度极其缓慢,性能表现赶不上会导致奖励方差较高但准确度较低的模型。
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