def available_lr_schedulers(cls) -> List[str]:
        """Returns a list containing the keys of the available LR schedulers."""
        registry: Optional[FlashRegistry] = getattr(cls, "lr_schedulers_registry", None)
        if registry is None:
            return []
        return registry.available_keys()
Returns a list containing the keys of the available LR schedulers.
src/flash/core/model.py