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title: "Stochastic Latent Trajectory随机潜在轨迹"
created: 2026-05-23
updated: 2026-05-23
type: concept
tags: [reasoning, stochastic, latent, trajectory]
sources: [raw/papers/gram-generative-recursive-reasoning-2026.md]
confidence: high
---
# Stochastic Latent Trajectory
> GRAM 的核心创新:将推理过程建模为**随机潜在轨迹**,每次递归步从分布中采样下一步状态,而非确定性更新。
## 形式化
给定输入 x 和前一步潜在状态 z_{t-1}
z_t ~ p_theta(z_t | z_{t-1}, e_x)
T 步后得到轨迹 (z_0, z_1, ..., z_T),最终预测由解码器从 z_T 产生。
## 关键区别
| | 确定性 RRM | GRAM (随机) |
|---|----------|------------|
| 转移 | z_t = f(z_{t-1}, e_x) | z_t ~ p(z_t | z_{t-1}, e_x) |
| 轨迹数 | 1 条 | 分布上的多条 |
| 预测 | 单点 | 边际化 |
## 为什么需要随机性
- 维持**不确定性**:不确定的区域保留多条路径
- 探索**替代策略**:不同轨迹探索不同解空间
- 实现**[[inference-time-scaling|推理时扩展]]**:通过并行采样轨迹 scale
## 相关概念
- [[gram-generative-recursive-reasoning|GRAM]]
- [[multi-trajectory-inference]]
- [[deep-and-wide-reasoning]]