solve some comments

dbgpt/storage/knowledge_graph/graph_retriever/document_graph_retriever.py

@@ -1,7 +1,7 @@
 """Dcoument Based Graph Retriever."""
 
 import logging
-from typing import List, Union, Optional
+from typing import List, Union, Optional, Tuple
 
 from pydantic import Field
 
@@ -28,7 +28,7 @@ def __init__(
 
     async def retrieve(
         self, subs: Optional[Union[List[str], List[List[float]]]], triplet_graph: Optional[Graph]
-    ) -> tuple[Graph, None]:
+    ) -> Tuple[Graph, None]:
         """Retrieve from document graph."""
 
         if triplet_graph:

dbgpt/storage/knowledge_graph/graph_retriever/graph_retriever_router.py

@@ -3,7 +3,7 @@
 import logging
 import os
 from abc import ABC, abstractmethod
-from typing import List, Optional, Union
+from typing import List, Optional, Union, Tuple
 
 from pydantic import Field
 
@@ -113,7 +113,7 @@ def __init__(
             similarity_search_score_threshold,
         )
 
-    async def retrieve(self, text: str) -> tuple[Graph, Graph, str]:
+    async def retrieve(self, text: str) -> Tuple[Graph, Graph, str]:
         """Retrieve subgraph from triplet graph and document graph."""
 
         subgraph = MemoryGraph()

dbgpt/storage/knowledge_graph/graph_retriever/keyword_based_graph_retriever.py

@@ -2,7 +2,7 @@
 
 import logging
 from abc import ABC, abstractmethod
-from typing import List, Optional
+from typing import List, Optional, Tuple
 
 from pydantic import Field
 
@@ -29,7 +29,7 @@ def __init__(self, graph_store_apdater, triplet_topk):
         self._graph_store_apdater = graph_store_apdater
         self._triplet_topk = triplet_topk
 
-    async def retrieve(self, keywords: List[str]) -> tuple[Graph, str]:
+    async def retrieve(self, keywords: List[str]) -> Tuple[Graph, str]:
         """Retrieve from triplets graph with keywords."""
 
         subgraph = self._graph_store_apdater.explore_trigraph(

dbgpt/storage/knowledge_graph/graph_retriever/text_based_graph_retriever.py

@@ -2,7 +2,7 @@
 
 import json
 import logging
-from typing import Dict, List, Union
+from typing import Dict, List, Union, Tuple
 
 from dbgpt.rag.transformer.intent_interpreter import IntentInterpreter
 from dbgpt.rag.transformer.text2gql import Text2GQL
@@ -23,7 +23,7 @@ def __init__(self, graph_store_apdater, triplet_topk, llm_client, model_name):
         self._intent_interpreter = IntentInterpreter(llm_client, model_name)
         self._text2gql = Text2GQL(llm_client, model_name)
 
-    async def retrieve(self, text: str) -> tuple[Graph, str]:
+    async def retrieve(self, text: str) -> Tuple[Graph, str]:
         """Retrieve from triplets graph with text2gql."""
 
         intention: Dict[

dbgpt/storage/knowledge_graph/graph_retriever/vector_based_graph_retriever.py

@@ -2,7 +2,7 @@
 
 import logging
 from abc import ABC, abstractmethod
-from typing import List, Optional
+from typing import List, Optional, Tuple
 
 from pydantic import Field
 
@@ -40,7 +40,7 @@ def __init__(
 
     async def retrieve(
         self, vectors: List[List[float]]
-    ) -> tuple[Graph, None]:
+    ) -> Tuple[Graph, None]:
         """Retrieve from triplet graph with vectors."""
 
         subgraph = self._graph_store_apdater.explore_trigraph(