refactor(rag): update rag params (#765)

Author: ch-liuzhide

server/agent/tools/knowledge.py

@@ -32,7 +32,7 @@ async def search_knowledge(
                     space_id_list=[bot_id, repo_name],
                     question=query,
                     embedding_model_name=EmbeddingModelEnum.OPENAI,
-                    similarity_threshold=0.65,
+                    similarity_threshold=0.6,
                     top=10,
                     metadata_filter={},
                 )

server/rag/router.py

@@ -60,8 +60,8 @@ async def reload_repo(
                         repo_name=request.repo_name, auth_token=user.access_token
                     ),
                     split_config=KnowledgeSplitConfig(
-                        chunk_size=500,
-                        chunk_overlap=100,
+                        chunk_size=1000,
+                        chunk_overlap=200,
                     ),
                 )
             ]