Search Results for author: Ryoki Hamano

Found 8 papers, 4 papers with code

CMA-ES for Discrete and Mixed-Variable Optimization on Sets of Points

no code implementations23 Aug 2024 Kento Uchida, Ryoki Hamano, Masahiro Nomura, Shota Saito, Shinichi Shirakawa

Discrete and mixed-variable optimization problems have appeared in several real-world applications.

Natural Gradient Interpretation of Rank-One Update in CMA-ES

1 code implementation24 Jun 2024 Ryoki Hamano, Shinichi Shirakawa, Masahiro Nomura

While the rank-one update makes the covariance matrix to increase the likelihood of generating a solution in the direction of the evolution path, this idea has been difficult to formulate and interpret as a natural gradient method unlike the rank-$\mu$ update.

CMA-ES for Safe Optimization

no code implementations17 May 2024 Kento Uchida, Ryoki Hamano, Masahiro Nomura, Shota Saito, Shinichi Shirakawa

This optimization setting is known as safe optimization and formulated as a specialized type of constrained optimization problem with constraints for safety functions.

Bayesian Optimization

(1+1)-CMA-ES with Margin for Discrete and Mixed-Integer Problems

no code implementations1 May 2023 Yohei Watanabe, Kento Uchida, Ryoki Hamano, Shota Saito, Masahiro Nomura, Shinichi Shirakawa

The margin correction has been applied to ($\mu/\mu_\mathrm{w}$,$\lambda$)-CMA-ES, while this paper introduces the margin correction into (1+1)-CMA-ES, an elitist version of CMA-ES.

Marginal Probability-Based Integer Handling for CMA-ES Tackling Single-and Multi-Objective Mixed-Integer Black-Box Optimization

1 code implementation19 Dec 2022 Ryoki Hamano, Shota Saito, Masahiro Nomura, Shinichi Shirakawa

If the CMA-ES is applied to the MI-BBO with straightforward discretization, however, the variance corresponding to the integer variables becomes much smaller than the granularity of the discretization before reaching the optimal solution, which leads to the stagnation of the optimization.

CMA-ES with Margin: Lower-Bounding Marginal Probability for Mixed-Integer Black-Box Optimization

3 code implementations26 May 2022 Ryoki Hamano, Shota Saito, Masahiro Nomura, Shinichi Shirakawa

If the CMA-ES is applied to the MI-BBO with straightforward discretization, however, the variance corresponding to the integer variables becomes much smaller than the granularity of the discretization before reaching the optimal solution, which leads to the stagnation of the optimization.

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