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20232026
most citedKoopman operators with intrinsic observables in rigged reproducing kernel Hilbert spaces

4 citations · 5 across the 10 of their papers we have counts for

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cs.LG2026

Unified generalization analysis for physics informed neural networks

Yuka Hashimoto, Tomoharu Iwata

Physics-Informed Neural Networks (PINNs) and their variational counterparts (VPINNs) are neural networks that incorporate physical laws, making them useful for scientific problems.…

cs.LG2025

Why High-rank Neural Networks Generalize?: An Algebraic Framework with RKHSs

Yuka Hashimoto, Sho Sonoda, Isao Ishikawa +1

We derive a new Rademacher complexity bound for deep neural networks using Koopman operators, group representations, and reproducing kernel Hilbert spaces (RKHSs). The proposed bou…

cs.LG2025

Why and When Deep is Better than Shallow: Implementation-Agnostic State-Transition Model of Deep Learning

Sho Sonoda, Yuka Hashimoto, Isao Ishikawa +1

We ask when adding hidden layers improves generalization, in a model that keeps the layers fixed and varies only their number. A hidden layer is a self-map of a state space, a dept…

cs.LG2024

Deep Ridgelet Transform and Unified Universality Theorem for Deep and Shallow Joint-Group-Equivariant Machines

Sho Sonoda, Yuka Hashimoto, Isao Ishikawa +1

We present a constructive universal approximation theorem for learning machines equipped with joint-group-equivariant feature maps, called the joint-equivariant machines, based on…

cs.LG2024

-Algebraic Machine Learning: Moving in a New Direction

Yuka Hashimoto, Masahiro Ikeda, Hachem Kadri

Machine learning has a long collaborative tradition with several fields of mathematics, such as statistics, probability and linear algebra. We propose a new direction for machine l…

cs.LG2023★ 1 cited

Deep Ridgelet Transform: Voice with Koopman Operator Proves Universality of Formal Deep Networks

Sho Sonoda, Yuka Hashimoto, Isao Ishikawa +1

We identify hidden layers inside a deep neural network (DNN) with group actions on the data domain, and formulate a formal deep network as a dual voice transform with respect to th…