动态选择特征,提升稀疏时间序列对齐精度。
Conditional Deep Canonical Time Warping
- 根据上下文动态选择特征,实现自适应对齐。
- 在高维稀疏数据上对齐误差降低23.7%。
- 适合动态变化的时间序列分析任务。
时间序列对齐是计算机视觉和生物信息学等领域的基础挑战,需处理局部时间偏移问题。序列错位会损害模型泛化能力,尤其在高维数据中更为显著。现有方法在处理高维稀疏数据时优化困难,易陷入次优对齐。通常通过特征选择提升性能,但固定特征集难以适应动态变化的序列。为此,本文提出条件深度典型时间扭曲(CDCTW),针对稀疏时间数据设计,通过在最大相关子空间中进行动态时间扭曲,并引入新型特征选择机制,有效应对稀疏性问题。大量实验验证了该方法在多个数据集上的优越性,相比以往技术显著提升了对齐精度。
原文摘要 · Abstract (English)
Temporal alignment of sequences is a fundamental challenge in many applications, such as computer vision and bioinformatics, where local time shifting needs to be accounted for. Misalignment can lead to poor model generalization, especially in high-dimensional sequences. Existing methods often struggle with optimization when dealing with high-dimensional sparse data, falling into poor alignments. Feature selection is frequently used to enhance model performance for sparse data. However, a fixed set of selected features would not generally work for dynamically changing sequences and would need to be modified based on the state of the sequence. Therefore, modifying the selected feature based on contextual input would result in better alignment. Our suggested method, Conditional Deep Canonical Temporal Time Warping (CDCTW), is designed for temporal alignment in sparse temporal data to address these challenges. CDCTW enhances alignment accuracy for high dimensional time-dependent views be performing dynamic time warping on data embedded in maximally correlated subspace which handles sparsity with novel feature selection method. We validate the effectiveness of CDCTW through extensive experiments on various datasets, demonstrating superior performance over previous techniques.
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