keras/src/optimizers/base_optimizer.py/BaseOptimizer/_check_super_called
class BaseOptimizer:    def _check_super_called(self):
        if not hasattr(self, "_lock"):
            raise RuntimeError(
                f"In optimizer '{self.__class__.__name__}', you forgot to call "
                "`super().__init__()` as the first statement "
                "in the `__init__()` method. "
                "Go add it!"
            )