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• W2901706452 abstract "We propose a novel multilinear dynamical system (MLDS) in a transform domain, named $mathcal{L}$-MLDS, to model tensor time series. With transformations applied to a tensor data, the latent multidimensional correlations among the frontal slices are built, and thus resulting in the computational independence in the transform domain. This allows the exact separability of the multi-dimensional problem into multiple smaller LDS problems. To estimate the system parameters, we utilize the expectation-maximization (EM) algorithm to determine the parameters of each LDS. Further, $mathcal{L}$-MLDSs significantly reduce the model parameters and allows parallel processing. Our general $mathcal{L}$-MLDS model is implemented based on different transforms: discrete Fourier transform, discrete cosine transform and discrete wavelet transform. Due to the nonlinearity of these transformations, $mathcal{L}$-MLDS is able to capture the nonlinear correlations within the data unlike the MLDS cite{rogers2013multilinear} which assumes multi-way linear correlations. Using four real datasets, the proposed $mathcal{L}$-MLDS is shown to achieve much higher prediction accuracy than the state-of-the-art MLDS and LDS with an equal number of parameters under different noise models. In particular, the relative errors are reduced by $50% sim 99%$. Simultaneously, $mathcal{L}$-MLDS achieves an exponential improvement in the model's training time than MLDS." @default.
• W2901706452 created "2018-11-29" @default.
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• W2901706452 date "2018-09-27" @default.
• W2901706452 modified "2023-09-26" @default.
• W2901706452 title "Transform-Based Multilinear Dynamical System for Tensor Time Series Analysis." @default.
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