修改属性图节点的层级结构，新增子父级关系

backend/app/engine/engine.py

@@ -14,6 +14,7 @@ from app.engine.response.treeSummResponse import CustomTreeResponse
 from llama_index.core.settings import Settings
 from llama_index.core.indices.property_graph import LLMSynonymRetriever,VectorContextRetriever
 from llama_index.core import PropertyGraphIndex
+from app.engine.retriever.graphKeyWordRetriever import GraphKeyWordRetriever
 
 ModelPlateCategory = '模型平台'
 
@@ -122,8 +123,7 @@ def create_query_engine(index,top_k=3, use_reranker=False, filters=None, respons
     llm_query = os.getenv('LLM_QUERY_WAY','rag')
     if llm_query == 'graph':
         graphIndex:PropertyGraphIndex = index
-        synonym_retriver = LLMSynonymRetriever(graphIndex.property_graph_store,
-                                               llm=Settings.llm,
+        keyWord_retriver = GraphKeyWordRetriever(graphIndex.property_graph_store,
                                                include_text=False
                                                )
         if graphIndex.property_graph_store.supports_vector_queries:
@@ -137,7 +137,7 @@ def create_query_engine(index,top_k=3, use_reranker=False, filters=None, respons
                                                 include_text=False
                                                 )
         
-        retriever = graphIndex.as_retriever(sub_retrievers=[synonym_retriver,vector_retriver])
+        retriever = graphIndex.as_retriever(sub_retrievers=[keyWord_retriver,vector_retriver])
 
     else:
         retriever = get_Retriever(index,