.. module:: optuna.exceptions
The :mod:`~optuna.exceptions` module defines Optuna-specific exceptions deriving from a base :class:`~optuna.exceptions.OptunaError` class. Of special importance for library users is the :class:`~optuna.exceptions.TrialPruned` exception to be raised if :func:`optuna.trial.Trial.should_prune` returns True for a trial that should be pruned.
.. autosummary:: :toctree: generated/ :nosignatures: optuna.exceptions.OptunaError optuna.exceptions.TrialPruned optuna.exceptions.CLIUsageError optuna.exceptions.StorageInternalError optuna.exceptions.DuplicatedStudyError