/kind feature
Describe the solution you'd like
I've just released Goptuna v0.6.0. It includes IPOP-CMA-ES and BIPOP-CMA-ES supports. As the benchmark results of two-dimensional Rastrigin function shows, these algorithms outperforms on multimodal functions.

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/assign @c-bata
@c-bata Thank you very much for contributing with this!
I think you can directly add changes for v1beta1 version, since v1alpha3 has been already released and we have plans to release v1beta1 later.
Cool! Thanks for the awesome work.
This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
/lifecycle frozen
Probably I will be able to open a pull request next month.
The latest version of Goptuna also supports Sobol's quasirandom sequence.
https://github.com/c-bata/goptuna/releases/tag/v0.8.0
That's great, thank you for your help @c-bata!
Most helpful comment
Cool! Thanks for the awesome work.