optuna.storages

The storages module defines a BaseStorage class which abstracts a backend database and provides library-internal interfaces to the read/write histories of the studies and trials. Library users who wish to use storage solutions other than the default in-memory storage should use one of the child classes of BaseStorage documented below.

optuna.storages.RDBStorage	Storage class for RDB backend.
optuna.storages.RetryFailedTrialCallback	Retry a failed trial up to a maximum number of times.
optuna.storages.fail_stale_trials	Fail stale trials and run their failure callbacks.
optuna.storages.JournalStorage	Storage class for Journal storage backend.
optuna.storages.JournalFileStorage	File storage class for Journal log backend.
optuna.storages.JournalFileSymlinkLock	Lock class for synchronizing processes for NFSv2 or later.
optuna.storages.JournalFileOpenLock	Lock class for synchronizing processes for NFSv3 or later.
optuna.storages.JournalRedisStorage	Redis storage class for Journal log backend.