keras/src/optimizers/loss_scale_optimizer.py/LossScaleOptimizer/from_config
class LossScaleOptimizer:    def from_config(cls, config, custom_objects=None):
        inner_optimizer = serialization_lib.deserialize_keras_object(
            config.pop("inner_optimizer"),
            custom_objects=custom_objects,
        )
        return cls(inner_optimizer, **config)