Tensor network square root Kalman filter for online Gaussian process regression
<|reference_start|>Tensor network square root Kalman filter for online Gaussian process regression: The state-of-the-art tensor network Kalman filter lifts the curse of dimensionality for high-dimensional recursive estimation problems. However, the required rounding operation can cause filter divergence due to the loss of positive definiteness of covariance matrices. We solve this issue by developing, for the first time, a tensor network square root Kalman filter, and apply it to high-dimensional online Gaussian process regression. In our experiments, we demonstrate that our method is equivalent to the conventional Kalman filter when choosing a full-rank tensor network. Furthermore, we apply our method to a real-life system identification problem where we estimate $4^{14}$ parameters on a standard laptop. The estimated model outperforms the state-of-the-art tensor network Kalman filter in terms of prediction accuracy and uncertainty quantification.<|reference_end|>
@article{menzen2024tensor,
    title={Tensor network square root Kalman filter for online Gaussian process
  regression},
    author={Clara Menzen and Manon Kok and Kim Batselier},
    journal={arXiv preprint arXiv:2409.03276},
    year={2024},
    archivePrefix={arXiv},
    eprint={2409.03276},
    primaryClass={cs.LG}
}