[GraphBolt] refine graph representation (#6733)

python/dgl/graphbolt/impl/fused_csc_sampling_graph.py

@@ -1022,10 +1022,18 @@ def _csc_sampling_graph_str(graph: FusedCSCSamplingGraph) -> str:
     """
     csc_indptr_str = str(graph.csc_indptr)
     indices_str = str(graph.indices)
-    meta_str = (
-        f"total_num_nodes={graph.total_num_nodes}, total_num_edges="
-        f"{graph.total_num_edges}"
-    )
+    meta_str = f"num_nodes={graph.total_num_nodes}, num_edges={graph.num_edges}"
+    if graph.node_type_offset is not None:
+        meta_str += f", node_type_offset={graph.node_type_offset}"
+    if graph.type_per_edge is not None:
+        meta_str += f", type_per_edge={graph.type_per_edge}"
+    if graph.node_type_to_id is not None:
+        meta_str += f", node_type_to_id={graph.node_type_to_id}"
+    if graph.edge_type_to_id is not None:
+        meta_str += f", edge_type_to_id={graph.edge_type_to_id}"
+    if graph.edge_attributes is not None:
+        meta_str += f", edge_attributes={graph.edge_attributes}"
+
     prefix = f"{type(graph).__name__}("
 
     def _add_indent(_str, indent):