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如果用惩罚因子替代约束条件,TRPO优化问题可以表述为:
PPO 则通过 裁剪目标函数(clipping)来实现对策略更新的控制。 Direct Preference Optimization。DPO 由斯坦福大学的研究者于 2023 年提出,它以一种惊人的简洁性,对传统的 RLHF 流程发起了挑战。DPO 的核心洞见是:我们完全可以绕过奖励模型建模这一中间步骤,直接 ...
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Walz issues warning order
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Rep. Steny Hoyer to retire
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