Clean up

model.py

@@ -41,7 +41,8 @@ class Model:
                                             self.scheduler_type)
         self.rng = random.Random()
 
-    def _load_pipeline(self, model_name: str,
+    @staticmethod
+    def _load_pipeline(model_name: str,
                        scheduler_type: str) -> DiffusionPipeline:
         repo_id = f'hysts/diffusers-anime-faces-{model_name}'
         if scheduler_type == 'DDPM':