修改属性图节点的层级结构，新增子父级关系

backend/app/engine/graph/graphStore.py

@@ -39,4 +39,22 @@ class RAGPropertyGraphStore(SimplePropertyGraphStore):
         graph.nodes = kg_nodes
         graph.relations = kg_relations
         
-        return cls(graph)
+        return cls(graph)
+    
+    def save_networkx_graph(self, name: str = "kg.html") -> None:
+        """Display the graph store, useful for debugging."""
+        import networkx as nx
+
+        G = nx.DiGraph()
+        for node in self.graph.nodes.values():
+            if isinstance(node,EntityNode):
+                G.add_node(node.id, label=node.name)
+        for triplet in self.graph.triplets:
+            G.add_edge(triplet[0], triplet[2], label=triplet[1])
+
+        # save to html file
+        from pyvis.network import Network
+
+        net = Network(notebook=False, directed=True)
+        net.from_nx(G)
+        net.write_html(name)