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---
title: "STAug (EMD-based Augmentation)"
created: 2026-05-26
type: concept
tags: ["time-series", "data-augmentation", "decomposition", "forecasting"]
sources: ["temporal-patch-shuffle-tps"]
---
# STAug
> 基于经验模态分解 (EMD) 的时间序列增强——将两序列的 IMF 通过 mixup 式插值重组。
## 流程
1. 对两个序列施加 EMD
2. 得到 intrinsic mode functions (IMFs)
3. 从均匀分布采样 mixup 式插值权重
4. 将两组 IMF 重新组合 → 混合了两个输入时间特征的新序列
## 优势
- 兼顾多样性与一致性的样本生成机制
- 分解保证了信号的物理合理性
## 致命缺陷
- **EMD 内存开销极大**ECL 和 Traffic 数据集上 GPU 内存不够无法评估
- 这一限制在 STAug 原论文中也有承认
- 不具备 [[temporal-patch-shuffle|TPS]] 的计算效率
## 相关页面
- [[time-series-forecasting-augmentation]] — 预测增强框架
- [[temporal-patch-shuffle]] — 计算高效的 SOTA 替代
- [[wavemask-wavemix]] — 分解类的 wavelet 替代