diff --git a/pilot/configs/config.py b/pilot/configs/config.py
index 8c03769b4..5846a7c1a 100644
--- a/pilot/configs/config.py
+++ b/pilot/configs/config.py
@@ -165,7 +165,9 @@ class Config(metaclass=Singleton):
         self.KNOWLEDGE_CHUNK_SIZE = int(os.getenv("KNOWLEDGE_CHUNK_SIZE", 100))
         self.KNOWLEDGE_CHUNK_OVERLAP = int(os.getenv("KNOWLEDGE_CHUNK_OVERLAP", 100))
         self.KNOWLEDGE_SEARCH_TOP_SIZE = int(os.getenv("KNOWLEDGE_SEARCH_TOP_SIZE", 5))
-        self.KNOWLEDGE_SEARCH_MAX_TOKEN = int(os.getenv("KNOWLEDGE_SEARCH_MAX_TOKEN", 2000))
+        self.KNOWLEDGE_SEARCH_MAX_TOKEN = int(
+            os.getenv("KNOWLEDGE_SEARCH_MAX_TOKEN", 2000)
+        )
         ### SUMMARY_CONFIG Configuration
         self.SUMMARY_CONFIG = os.getenv("SUMMARY_CONFIG", "FAST")
 
diff --git a/pilot/scene/chat_knowledge/v1/prompt.py b/pilot/scene/chat_knowledge/v1/prompt.py
index 5dbdbf602..d82984aee 100644
--- a/pilot/scene/chat_knowledge/v1/prompt.py
+++ b/pilot/scene/chat_knowledge/v1/prompt.py
@@ -12,7 +12,7 @@ from pilot.scene.chat_normal.out_parser import NormalChatOutputParser
 CFG = Config()
 
 PROMPT_SCENE_DEFINE = """A chat between a curious user and an artificial intelligence assistant, who very familiar with database related knowledge. 
-    The assistant gives helpful, detailed, professional and polite answers to the user's questions. """
+The assistant gives helpful, detailed, professional and polite answers to the user's questions. """
 
 
 _DEFAULT_TEMPLATE_ZH = """ 基于以下已知的信息, 专业、简要的回答用户的问题,
diff --git a/pilot/server/knowledge/service.py b/pilot/server/knowledge/service.py
index 3cd7589e5..4310038c5 100644
--- a/pilot/server/knowledge/service.py
+++ b/pilot/server/knowledge/service.py
@@ -188,7 +188,7 @@ class KnowledgeService:
                     text_splitter = SpacyTextSplitter(
                         pipeline="zh_core_web_sm",
                         chunk_size=chunk_size,
-                        chunk_overlap=chunk_overlap
+                        chunk_overlap=chunk_overlap,
                     )
                 except Exception:
                     text_splitter = RecursiveCharacterTextSplitter(
diff --git a/pilot/vector_store/chroma_store.py b/pilot/vector_store/chroma_store.py
index 451d9952c..d53071caa 100644
--- a/pilot/vector_store/chroma_store.py
+++ b/pilot/vector_store/chroma_store.py
@@ -26,10 +26,10 @@ class ChromaStore(VectorStoreBase):
             persist_directory=self.persist_dir,
             embedding_function=self.embeddings,
             client_settings=chroma_settings,
-            collection_metadata=collection_metadata
+            collection_metadata=collection_metadata,
         )
 
-    def similar_search(self, text, topk,  **kwargs: Any) -> None:
+    def similar_search(self, text, topk, **kwargs: Any) -> None:
         logger.info("ChromaStore similar search")
         return self.vector_store_client.similarity_search(text, topk)