fix: enhance algorithm group management in SmashConfig when loading old configs

src/pruna/config/smash_config.py

@@ -172,6 +172,24 @@ def load_from_json(self, path: str) -> None:
 
             setattr(self, name, config_dict.pop(name))
 
+        # Normalize algorithm groups in config dict
+        current_groups = set(config_dict.keys())
+        expected_groups = set(ALGORITHM_GROUPS)
+
+        # Remove extra groups with warning if they have values
+        for group in current_groups - expected_groups:
+            if config_dict[group] is not None:
+                pruna_logger.warning(
+                    f"Removing non-existing algorithm group: {group}, with value: {config_dict[group]}.\n"
+                    "This is likely due to a version difference between the saved model and the current library.\n"
+                    "You can use an older version of Pruna to load the model or reconfigure the model."
+                )
+            del config_dict[group]
+
+        # Add missing groups with info message
+        for group in expected_groups - current_groups:
+            config_dict[group] = None
+
         self._configuration = Configuration(SMASH_SPACE, values=config_dict)
 
         if os.path.exists(os.path.join(path, TOKENIZER_SAVE_PATH)):