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Author

Taejun Park

University of Oxford

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Preprint Sep 2026

Randomized Jacobi-Davidson method

A randomized Jacobi-Davidson method is introduced that replaces this orthogonalization with a much cheaper randomized orthogonalization process, which requires no inner products involving full-dimensional vectors and matches the reliability of classical Jacobi-Davidson while reducing orthogonalization cost.

L. Grigori, Taejun Park, Igor Simunec · 0 citations
#machine learning Preprint Sep 2026

SuperPCA: subspace analysis and an efficient algorithm for high-dimensional PCA

Principal component analysis (PCA) is a fundamental tool to reduce the dimensionality of the data in many applications. PCA finds a few signal directions that contain most of the variability of the data by computing the eigenvectors of the sample covariance matrix. In this work, we focus on the spiked covariance model,...

Irina-Beatrice Haas, Maike Meier, Yuji Nakatsukasa et al. · 0 citations
Preprint Aug 2026

Randomized Block Davidson Eigensolvers for Plane-Wave Density-Functional Theory

Iterative diagonalization is the dominant cost of plane-wave density-functional theory (DFT), with search-space orthogonalization scaling particularly quickly with problem size and the number of target states. We present a randomized block Davidson-type eigensolver that replaces Euclidean orthogonalization with randomi...

Moritz Gubler, Taejun Park, Augustin Bussy et al. · 1 citation

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