Hideaki Imamura

@not522 Any update on this friendly reminder :)

Thanks @avats-dev for your interest in contributing! For the benchmarking, I share some information. - Optuna committers often benchmark with a benchmarking software called [kurobako](https://github.com/optuna/kurobako). It includes some hyperparameter optimization...

Let me reassign the reviewers. @c-bata Could you review this PR?

Thank you for the PR. Also, I appreciate your explanation of the specific motivation for the changes. Unfortunately, the motivation for the change you've explained is not clear, and without...

Could you try to the followings described in the original issue https://github.com/optuna/optuna/issues/5242? - List up all the files in optuna/ repositories which need updating, - Carefully examine the change logs...

We have decided not to proceed this task until the minimal Optuna is broken with numpy < 1.17. This is for users in clusters, for example, who cannot easily upgrade...

Let me reopen this issue.

@eukaryo @y0z Could you review this PR?

Let me merge this PR with my one approval since we need this feature.

We would like to resolve this issue after removing the cached storage, which is ongoing in the committers.