optuna.study.create_study(storage: Union[None, str, storages.BaseStorage] = None, sampler: samplers.BaseSampler = None, pruner: pruners.BasePruner = None, study_name: Optional[str] = None, direction: str = 'minimize', load_if_exists: bool = False) → Study[source]

Create a new Study.

  • storage

    Database URL. If this argument is set to None, in-memory storage is used, and the Study will not be persistent.


    When a database URL is passed, Optuna internally uses SQLAlchemy to handle the database. Please refer to SQLAlchemy’s document for further details. If you want to specify non-default options to SQLAlchemy Engine, you can instantiate RDBStorage with your desired options and pass it to the storage argument instead of a URL.

  • sampler – A sampler object that implements background algorithm for value suggestion. If None is specified, TPESampler is used as the default. See also samplers.

  • pruner – A pruner object that decides early stopping of unpromising trials. See also pruners.

  • study_name – Study’s name. If this argument is set to None, a unique name is generated automatically.

  • direction – Direction of optimization. Set minimize for minimization and maximize for maximization.

  • load_if_exists – Flag to control the behavior to handle a conflict of study names. In the case where a study named study_name already exists in the storage, a DuplicatedStudyError is raised if load_if_exists is set to False. Otherwise, the creation of the study is skipped, and the existing one is returned.


A Study object.