Compression of the Koopman matrix for nonlinear physical models via hierarchical clustering
<|reference_start|>Compression of the Koopman matrix for nonlinear physical models via hierarchical clustering: Machine learning methods allow the prediction of nonlinear dynamical systems from data alone. The Koopman operator is one of them, which enables us to employ linear analysis for nonlinear dynamical systems. The linear characteristics of the Koopman operator are hopeful to understand the nonlinear dynamics and perform rapid predictions. The extended dynamic mode decomposition (EDMD) is one of the methods to approximate the Koopman operator as a finite-dimensional matrix. In this work, we propose a method to compress the Koopman matrix using hierarchical clustering. Numerical demonstrations for the cart-pole model and comparisons with the conventional singular value decomposition (SVD) are shown; the results indicate that the hierarchical clustering performs better than the naive SVD compressions.<|reference_end|>
@article{nishikata2024compression,
    title={Compression of the Koopman matrix for nonlinear physical models via
  hierarchical clustering},
    author={Tomoya Nishikata and Jun Ohkubo},
    journal={Nonlinear Theory and its Applications, IEICE vol. 15, pp. 938-953
  (2024)},
    year={2024},
    doi={10.1587/nolta.15.938},
    archivePrefix={arXiv},
    eprint={2403.18181},
    primaryClass={cs.LG math.DS}
}