class ArenaError(Exception):
    """Base class for Optimization Arena errors."""


class DeviceUnavailableError(ArenaError):
    """Raised when a requested torch device is unavailable."""


class TaskError(ArenaError):
    """Raised when task creation or task execution fails."""


class SubmissionValidationError(ArenaError):
    """Raised when submitted optimizer source violates arena rules."""


class SubmissionExecutionError(ArenaError):
    """Raised when submitted optimizer source fails while being executed."""


class ArenaRunError(ArenaError):
    """Raised when an optimization run fails."""