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---
title: "验证三难Verification Trilemma"
created: 2026-07-02
updated: 2026-07-02
type: concept
tags: [verification, evaluation, reward-design]
sources:
- "[[verification-horizon-no-silver-bullet]]"
---
# 验证三难Verification Trilemma
验证信号的三个质量维度——**Scalability可扩展性**、**Faithfulness忠实性**、**Robustness鲁棒性**——难以同时实现。
## 三个维度
| 维度 | 定义 | 核心问题 |
|------|------|---------|
| **Scalability** | 能否以训练规模廉价生产信号 | 成本约束 |
| **Faithfulness** | 信号反映多少真实用户意图 vs 窄化代理 | 代理偏差 |
| **Robustness** | 面对对抗输入和优化压力时判断是否稳定 | 对抗退化 |
## 现有方案的取舍
| 方案 | Scalability | Faithfulness | Robustness |
|------|:---:|:---:|:---:|
| 单元测试 | ✅ | ❌(仅覆盖薄层) | ✅(相对) |
| LLM Judge | ✅ | ✅ | ❌(易被利用) |
| 人工专家评审 | ❌ | ✅ | ✅ |
**三个全满的验证器——廉价、深度、抗博弈——正是目前缺失的。**
## 在论文中的体现
论文的四类验证器各自在三维中作出不同取舍:
- [[test-driven-rewards|测试驱动奖励]]:优先 scalability + robustness牺牲 faithfulness
- [[interactive-judge|交互式判断器]]:增强 robustness抵抗长度利用
- [[human-implicit-reward-signals|用户反馈]]:最大化 faithfulnessscalability 靠大规模用户
- [[agent-evaluator|Agent 评估器]]:兼顾 scalability + faithfulness但 robustness 弱
## 参考
- [[verification-horizon-no-silver-bullet|论文原文]]
- [[verification-horizon|验证边界]]