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• W2739717106 abstract "The diffusion forecasting is a nonparametric approach that provably solves the Fokker-Planck PDE corresponding to It^o diffusion without knowing the underlying equation. The key idea of this method is to approximate the solution of the Fokker-Planck equation with a discrete representation of the shift (Koopman) operator on a set of basis functions generated via the diffusion maps algorithm. While the choice of these basis functions is provably optimal under appropriate conditions, computing these basis functions is quite expensive since it requires the eigendecomposition of an $Ntimes N$ diffusion matrix, where $N$ denotes the data size and could be very large. For large-scale forecasting problems, only a few leading eigenvectors are computationally achievable. To overcome this computational bottleneck, a new set of basis functions constructed by orthonormalizing selected columns of the diffusion matrix and its leading eigenvectors is proposed. This computation can be carried out efficiently via the unpivoted Householder QR factorization. The efficiency and effectiveness of the proposed algorithm will be shown in both deterministically chaotic and stochastic dynamical systems; in the former case, the superiority of the proposed basis functions over purely eigenvectors is significant, while in the latter case forecasting accuracy is improved relative to using a purely small number of eigenvectors. Supporting arguments will be provided on three- and six-dimensional chaotic ODEs, a three-dimensional SDE that mimics turbulent systems, and also on the two spatial modes associated with the boreal winter Madden-Julian Oscillation obtained from applying the Nonlinear Laplacian Spectral Analysis on the measured Outgoing Longwave Radiation (OLR)." @default.
• W2739717106 created "2017-08-08" @default.
• W2739717106 creator A5034663047 @default.
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• W2739717106 date "2017-12-14" @default.
• W2739717106 modified "2023-10-17" @default.
• W2739717106 title "Diffusion Forecasting Model with Basis Functions from QR-Decomposition" @default.
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• W2739717106 doi "https://doi.org/10.1007/s00332-017-9430-1" @default.
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