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