How can exploit parallelism in Optuna?

SuccessiveHalvingPruner is supposed to be executed in parallel way. How can configure our code (simple code) to exploit the exploit parallelism in Optuna?

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[himkt]

The error shows you failed to connect MySQL server. You have to install and launch a server first. Then make sure that you can connect a server by MySQL CLI. Let me put the reference to MySQL documentation.

After you succeed to set up a MySQL server, create a database. (ref. https://optuna.readthedocs.io/en/latest/tutorial/10_key_features/004_distributed.html)

You can also use other backends such as SQLite, PostgreSQL, and Redis. I recommend you to use MySQL or PostgreSQL for distributed optimization.

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