Search Results for author: Jun Ohkubo

Found 9 papers, 0 papers with code

Compression of the Koopman matrix for nonlinear physical models via hierarchical clustering

no code implementations27 Mar 2024 Tomoya Nishikata, Jun Ohkubo

The Koopman operator is one of them, which enables us to employ linear analysis for nonlinear dynamical systems.

Clustering

Attention-Enhanced Reservoir Computing

no code implementations27 Dec 2023 Felix Köster, Kazutaka Kanno, Jun Ohkubo, Atsushi Uchida

Photonic reservoir computing has been recently utilized in time series forecasting as the need for hardware implementations to accelerate these predictions has increased.

Temporal Sequences Time Series +1

Characterization of Locality in Spin States and Forced Moves for Optimizations

no code implementations5 Dec 2023 Yoshiki Sato, Makiko Konoshima, Hirotaka Tamura, Jun Ohkubo

Ising formulations are widely utilized to solve combinatorial optimization problems, and a variety of quantum or semiconductor-based hardware has recently been made available.

Combinatorial Optimization

Embedding stochastic differential equations into neural networks via dual processes

no code implementations8 Jun 2023 Naoki Sugishita, Jun Ohkubo

We propose a new approach to constructing a neural network for predicting expectations of stochastic differential equations.

Connection among stochastic Hamilton-Jacobi-Bellman equation, path-integral, and Koopman operator on nonlinear stochastic optimal control

no code implementations10 Dec 2020 Jun Ohkubo

This paper gives a new insight into nonlinear stochastic optimal control problems from the perspective of Koopman operators.

Optimization and Control Statistical Mechanics

Derivation of QUBO formulations for sparse estimation

no code implementations11 Jan 2020 Tomohiro Yokota, Makiko Konoshima, Hirotaka Tamura, Jun Ohkubo

We propose a quadratic unconstrained binary optimization (QUBO) formulation of the l1-norm, which enables us to perform sparse estimation of Ising-type annealing methods such as quantum annealing.

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