fix eval backend

src/backend.py

@@ -39,7 +39,7 @@ def _backend_routine():
         evaluated_models.add((report["config"]["model_id"], report["config"]["model_sha"]))
 
     # Find the models that are not associated with any results
-    pending_models = set(compatible_models) - evaluated_models
+    pending_models = list(set(compatible_models) - evaluated_models)
     logger.info(f"Found {len(pending_models)} pending models")
 
     if len(pending_models) == 0:
@@ -83,3 +83,6 @@ def backend_routine():
         _backend_routine()
     except Exception as e:
         logger.error(f"{e.__class__.__name__}: {str(e)}")
+
+if __name__=="__main__":
+    backend_routine()