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From Entanglement to Alignment: Representation Space Decomposition for Unsupervised Time Series Domain Adaptation

Created by
  • Haebom

Author

Rongyao Cai, Ming Jin, Qingsong Wen, and Kexin Zhang

Outline

This paper proposes DARSD, a novel unsupervised domain adaptation (UDA) framework for solving the domain shift problem in time series analysis. Unlike existing UDA methods that treat features as individual elements, DARSD addresses the UDA problem from the perspective of representation space decomposition by considering the internal composition of features. DARSD consists of three main components: (I) an adversarially learnable common invariant basis that projects features into domain-invariant subspaces; (II) a circular pseudo-labeling mechanism that dynamically separates target features based on confidence; and (III) a hybrid contrastive learning strategy that simultaneously enhances feature clustering and consistency while mitigating distributional differences. On four benchmark datasets (WISDM, HAR, HHAR, and MFD), DARSD achieves optimal performance in 35 of 53 scenarios, ranking first in all benchmarks, compared to 12 UDA algorithms.

Takeaways, Limitations

Takeaways:
Overcoming the limitations of existing methods by approaching the UDA problem from a new perspective of expression space decomposition.
Achieving excellent domain adaptation performance through the synergy of three components.
Demonstrated outstanding performance on various time series datasets.
Provides theoretical explanation possibilities.
Limitations:
The computational cost of the proposed method may be higher than that of existing methods.
There is a possibility that it will show specialized performance for a specific time series dataset.
Further validation of generalization performance in real-world applications is needed.
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