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SSD-TS: Exploring the Potential of Linear State Space Models for Diffusion Models in Time Series Imputation

Created by
  • Haebom

Author

Hongfan Gao, Wangmeng Shen, Xiangfei Qiu, Ronghui Xu, Jilin Hu, Bin Yang

Outline

This paper presents a novel approach that overcomes the limitations of existing noise-removing diffusion probabilistic model (DDPM)-based methods for compensating missing values in probabilistic time series data. Existing DDPM-based methods suffer from high time-series modeling time complexity and ineffective handling of dependencies in time series data. To address these issues, this paper utilizes a state-space model (SSM), such as Mamba, as the backbone of the DDPM's noise-removing module and designs several SSM-based blocks for time series data modeling. Experimental results demonstrate that the proposed methodology achieves state-of-the-art time series missing value compensation performance on a variety of real-world datasets. The code and datasets are publicly available.

Takeaways, Limitations

Takeaways:
The time complexity problem and time series dependency processing problem of DDPM-based probabilistic time series missing value supplementation were effectively solved by utilizing the state space model (SSM).
The superiority of the methodology was verified by achieving state-of-the-art performance on various real-world datasets.
We increased the reproducibility and scalability of our research by releasing the code and dataset as open source.
Limitations:
The performance of the proposed methodology may be biased for certain types of time series data.
Robustness analysis for various hyperparameter settings may be lacking.
Further experiments are needed on datasets with more complex and diverse time series patterns.
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