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怎样避免在多轮对话训练中出现的奖励稀疏问题?

2025-08-28 46

密集奖励设计策略

针对多轮对话的奖励稀疏问题,Verifiers提出分阶段奖励设计方案::

  • 过程奖励: ByMultiTurnEnv(used form a nominal expression)env_response方法返回中间奖励
  • grammar check: inRubric中配置JSON格式验证等基础奖励
  • Courses of Study:先用SingleTurnEnv训练基础能力再迁移到多轮环境

Specific implementation:

  1. defineStepReward类计算对话连贯性等中间指标
  2. utilizationvf.Rubric组合多个奖励函数(建议设置0.3-0.5的过程奖励权重)
  3. pass (a bill or inspection etc)vf-eval命令行工具实时监控奖励分布
  4. 对长期任务采用gamma=0.9的折扣因子平衡即时/未来奖励

实验表明,该方法能使代理在50-100次迭代内获得有效学习信号。

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