finish agent

Former-commit-id: d8d9d3afe32725fe79120fcd1a0970fdcdc45625

src/llmtuner/data/formatter.py

@@ -74,6 +74,9 @@ class Formatter(ABC):
     def apply(self, **kwargs) -> SLOTS:
         ...
 
+    def extract(self, content: str) -> Union[str, Tuple[str, str]]:
+        raise NotImplementedError
+
 
 @dataclass
 class EmptyFormatter(Formatter):